Is Your Car Running Hot but Not Overheating?

overheating gauge, car running hot but not overheatingHow often do you look at your temperature gauge?  If you are like most drivers, our guess would be almost never.  Most drivers look at their temperature gauge so rarely that many vehicle manufacturers don’t even include temperature gauges any more but just lights that will come on if your car is either extremely cold or extremely hot.  However, if your car is running hot but not overheating, you might not know it without a gauge.

However, even if your vehicle has a temperature gauge it may not be telling you as much as you think.  Many factory temperature gauges are designed to read in the middle of the gauge over an extremely wide range of temperatures and may not tell you if you have a car running hot but not overheating.

f you’re looking for a quick and easy way to get an accurate reading of your coolant temperature, you may consider using a device that can read the exact temperature from your car’s coolant temperature sensor.  There are many options for tools can use but one of the most versatile is a BlueTooth OBD2 code reader and an app on your phone where you can read different values from each sensor, including the coolant temperature sensor.

If you find that you’ve got a car running hot but not overheating there might be a few reasons:

  • Clogged or damaged radiator
  • Low coolant level
  • Damaged water pump or thermostat
  • Overworked engine

Assuming your cooling system is working properly meaning it’s full of clean coolant and doesn’t have any damaged or clogged components, then it’s possible your cooling system just needs a little help to keep things at the right temperature.  To give your cooling system a boost, add BlueDevil Engine Cool to your coolant to give it that extra cooling capacity to keep your car from running hot.

You can find BlueDevil Engine Cool at any of our partnering local auto parts stores like:

  • AutoZone
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  • Bumper to Bumper Auto Parts Specialists
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  • Bumper to Bumper Auto Parts
  • Any Part Auto Parts
  • Consumer Auto Parts

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overheating_guage.jpg – By Allanswart – Licensed by Getty Images – Original Link

 

109 responses to “Is Your Car Running Hot but Not Overheating?

  1. What about this scenario: so far, this has only happened on an unseasonably warm day and a colder day, the day later. I was warming up my car like I normally do in cold weather, and I probably shouldn’t have done this on the warmer day (about 55). I was in house while car was warming up; heat was on, but not full blast. I came out about a half hour later and temp gage was ridiculously high, but not on “overheat”. As soon as I got into gear and started driving, it came down to normal and I had no issues the rest of the day, with a good amount of driving. The next day I did the same thing, although I only warmed up for about 10 minutes. Again, looks like gage was getting high. I had heat on full blast. Again, I drove car and temp gage came right down to normal. Before answering, please consider that I DO normally warm my car up in the winter for long periods of time and have never had this problem.

    1. Will-

      Based on your description, the best place to start would be to check that the thermostat is functioning properly. You can test the thermostat yourself by placing it in boiling water and ensuring it is opening up at the correct temperature. Assuming your cooling system is working properly meaning it’s full of clean coolant and doesn’t have any damaged or clogged components, then it’s possible your cooling system just needs a little help to keep things at the right temperature. To give your cooling system a boost, add BlueDevil Engine Cool to your coolant to give it that extra cooling capacity to keep your car from running hot.

      Thank you!

      -BDP

    2. Cooling fans …check to see if they come on…….if not take connectors apart and make sure there clean and in good shape…..

    3. Why is my car overheating, it only overheats when the oil coolant sensor is on, as soon as I take it off the car runs perfect without any issues no smoke or anything( i take the negative charge off the battery allow the computer to reset and the car is brand new again). It also jerks and stalls when the sensor on ?

      1. Robert-

        Based on your description, we would recommend replacing the oil coolant sensor. It’s possible that a faulty sensor would send incorrect information to the vehicle’s computer system and affect engine performance. Based on the vehicle running normally with the sensor removed, a faulty sensor is likely the culprit for your issues.

        Thank you!

        -BDP

  2. Car isn’t overheating at all but the temperature hand goes all the way to hot,what is the problem and how can I solve it

    1. Pamela-

      If the temperature hand is going to the H indicator on the temperature guage, it would indicate overheating. Is the vehicle losing water/coolant? Please contact our technical support line at 888-863-0426 so that we can get a little better understanding of the vehicle’s condition and be able to make any appropriate recommendations.

      Thank you!

      -BDP

  3. whenever i sit in traffic or a long drive thru line my car begins to overheat. when i drive off it goes back down but when i turned my car off it started smoking. what could possibly be the issue?

    1. Alexus-

      Where was the white smoke coming from? Have you noticed a loss of water/coolant? Please contact our technical support line at 888-863-0426 so that we can get a little better understanding of the vehicle’s condition and be able to make any appropriate recommendations.

      Thank you!

      -BDP

  4. My car warms up fine. After a short drive in the city, tempreture will go up close to the red and then within seconds it will drop back down to normal. It does this every 10 minute or so. When I drive on the freeway its never does this only driving in city. I’m thinking of changing the thermostat and then flushing the radiator? Thoughts?

    1. Mike-

      Based on your description, it does sound like you are having an issue with flow, although intermittent. Checking the thermostat and flushing the cooling system would be a great place to start. A faulty thermostat and/or a contaminated cooling system could restrict circulation and cause the temperature to rise. If doing those two things doesn’t correct the issue, another component to consider would be the water pump.

      Hope this helps!

      -BDP

    2. Make sure coolant level is good……..if it’s cold out and you lose heat while idling and get heat back when your moving check fluid level……cheapest fix…

  5. My car has been losing coolant lately. The temp hand is slightly higher than usual sitting on 1/2. Usually it’s a little below that. I can’t drive it for 10 minutes before it starts steaming from under the hood because of the loss of coolant. All the time this is going on the temp hand remains at 1/2. Any ideas on what this may be?

    1. Audree-

      How quickly are you losing coolant? Typically, the temperature hand reading at the 1/2 way mark doesn’t indicate overheating and in most vehicles, actually indicates normal operating temperature. Please contact our technical support line at 888-863-0426 so that we can get a little better understanding of the vehicle’s condition and be able to make any appropriate recommendations.

      Thank you!

      -BDP

  6. Our radiator had a blow up in December. It got hot and spewed on the engine. We took it to a mechanic and he flushed it and refilled it. He said the coolant was like “tang” (drink). A week later we had issues with the heaert not getting hot and took it back. He fixed it and everything seemed fine. The temperature gauge then began reading at the 2/3 mark and it never went past 1/2 before. We took the vehicle to another mechanic and they flushed it again and said it was fine. Now 2 months later we are still having it read at the 2/3 mark when we have driven about 45 min and then park. After parking it will go to the 3/4 mark and back to half in a matter of 2 minutes. While driving, city and highway miles, it stays at the 1/2 mark. It USUALLY only reads a hotter temperature when we have driven for a while and then park it. The engine does not feel hot when I lift up the hood. I don’t know what to do! We are going on vacation in a month and want to be sure it will be ok. Can you help?

    1. T. Childers-

      Have you noticed a loss of water/coolant? Based on your description, it is also possible that you are getting combustion/exhaust gases pumping back into the cooling system. You can use a “Block Dye Tester” to confirm whether or not that is the case.
      BlueDevil Head Gasket Sealer would still work if your vehicle is getting combustion/exhaust gases blowing into the cooling system and creating pressure. To give yourself the best overall chance of BlueDevil working successfully, in addition to the directions, you should remove the spark plug from the cylinder with the leak; this will be the spark plug from the cylinder with the low compression reading. If you are not sure which one that is, you may pull all of the spark plugs and will notice one will have a white-crystal-like substance on it and/or may look dirty; this is the plug you should pull. Leave that plug out for the 50 minute idle in order to relieve the pressure from building up and thus allowing the product to seal properly. Be sure to follow the guidelines for the proper amount to use based on the size of your cooling system.

      Thank you!

      -BDP

      1. Thank you for the reply! There has not been loss of water/coolant since we first had it fixed. I will try your suggestions. Thank you so much!

  7. My car does not have any leaks and full on coolant. After driving for about 45min to a hour while on the highway most of the time, the temperature gauge start to show the temperature go up but only 1 bar nothing to bad or to hot but when i put it in neutral and rev my engine just a little it will go down. But 20-40min later it will do it again. I all ready had the water pump replace and radiator cap replace about 5 months ago and it just started happening last couple of weeks.

    1. Evan-

      Based on your description, it is possible that you are dealing with a slight restriction in the cooling system, causing the temp gauge to fluctuate. If you have not done so already, try checking the thermostat to make sure it is opening up at the correct temperature. You can place the thermostat in boiling water to make sure it will open up. If the thermostat seems fine, a cooling system flush would be the next recommendation. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

      1. Vinny-

        Is the vehicle overheating when you have the A/C on? Please contact our technical support line at 888-863-0426 so that we can get a little better understanding of the vehicle’s condition and be able to make any appropriate recommendations.

        Thank you!

        -BDP

  8. my car is going straight to hot after getting my alternator replaced but there is no smoke coming out but it is making this grinding noise

    1. Treazura-

      Is the vehicle overheating or is the temperature just fluctuating? Was the vehicle losing water/coolant? Please contact our technical support line at 888-863-0426 so that we can get a little better understanding of the vehicle’s condition and be able to make any appropriate recommendations.

      Thank you!

      -BDP

  9. My vehicle’s entire engine bay (hood and all parts under the hood) becomes very hot to the touch in a short amount of time. The vehicle does NOT overheat, and temperature gauges are all normal. The vehicle did not always feel so hot to the touch after use but has for some time now. I am concerned with parts becoming damaged over time even though most are heat resistant–the amount of constant heat is unusual. I am curious if this is potentially a radiator, thermostat, or water pump issue.

    1. CJ-

      Are the fans kicking on in this short amount of time? Usually, if the thermostat and/or water pump are faulty, you will have an issue with overheating. The fact that you are saying the temp gauge is staying in the normal range lends to reason that both are working properly. Please contact our technical support line at 888-863-0426 so that we can get a little better understanding of the vehicle’s condition and be able to make any appropriate recommendations.

      Thank you!

      -BDP

    2. Cj mine does the same thing in my 4.8 silverado but my 4.8 tahoe and my 5.3 z71 tahoe do not even at idle. It’s not really a concern for me except somedays my 4.8 silverado is my work office”security”.I have the same concern that you have about Parts being at a constant high temperature when I am sitting in the lot I usually raise my hood and park in the shade if not heat can be felt from 5 ft away from the vehicle with the hood closed to the point that the AC have a hard time cooling the vehicle on the inside other than that though my AC blow frigid when the hood is open and on hot days rolling down the road. It is an older truck so I was even thinking about cutting a hole in the hood and putting a louvered Hood like some 4x4s have or putting a exhaust fan on the top like you see external radiators have.

  10. 2013 2.4 liter Dodge Advenger…all new top engine heads and gaskets and thermostat a year ago. 160k miles, was running great until yesterday. When I noticed that the car is running hotter then usual. Its usually at the 1/2 way mark…its now creeping above it. I see no leaks, fluids are full. No white smoke coming from exhaust…I am frustated. Any ideas, spent so much money on this last year…Help. thanks. Jen in NJ

    1. Jen-

      Thank you for asking about your Dodge Avenger. Are you hearing the fans click on when the temperature starts to rise? Please contact our technical support line at 888-863-0426 so that we can get a little better understanding of the vehicle’s condition and be able to make any appropriate recommendations.

      Thank you!

      -BDP

  11. Hello I’m having the puzzling issue with my car, so I have a 2007 dodge caliber that doesn’t quite over heat but my sensor comes on after driving for a long period of time. The maximum drive time is about 2hrs straight (road trips) and the CTS will come on but the temperature gauge will remain at a cool level , but the CTS coming on will cause the car to slow down to a complete stop and will not start till the car has cool down why is that ? Remind you the car doesn’t overheat

    1. Keisha-

      Thank you for asking about your Dodge Caliber. Are you hearing the fans kick on when the coolant temperature sensor light comes on? Based on your description, it may just be a faulty temperature sensor, which replacing the sensor would alleviate the issue. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  12. Hello,
    Last night my car was running warmer than usual- at about the 3/4 mark- and after i parked it, it started to leak quite a bit of coolant. I thought there was a hose or reservoir leak so i let it cool. Now i can not find any leaks, and my coolant is still sitting close to full. There was no steam and it never actually overheated. Any ideas on what could cause this?

    1. Caitlin-

      What kind of vehicle was it and how many miles are on it? Please contact our technical support line at 888-863-0426 so that we can get a little better understanding of the vehicle’s condition and be able to make any appropriate recommendations.

      Thank you!

      -BDP

  13. My Hyundai i20 2009 is the fan is kicking, everything runs fine, the temp gauge is seating at half but the engine and the radiator pipes are very very hot no leaks just hot I removed the thermostat, thought it was dead but I never replaced it I biapassed it. Any idea

    1. Lannie-

      Thank you for asking about your Hyundai. Based on your description, it doesn’t seem like there is an issue. The temperature gauge sitting at about the half way mark is normal operating temperature in most vehicles. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  14. I have a 2005 Nissan Pathfinder i started smelling antifreeze so i parked vehicle to cool off as it was cooling off antifreeze started leaking. My gauges never showed hot. I filled it up again let it run for a few minutes and noticed there was no circulation. What can be the problem?

    1. Candie-

      Thank you for asking about your Nissan Pathfinder. Circulation can be restricted for a number of different reasons. Perhaps the thermostat is stuck closed and not allowing proper circulation. You can test the thermostat by removing it and putting it in boiling water. The water pump could also be the culprit, as its responsible for circulation. Another possibility is that jellied antifreeze or other debris could be clogging/restricting flow. Flushing the cooling system should alleviate the lack of circulation if that is the case.

      Hope this helps!

      -BDP

  15. 2002 Honda Accord. Car is running hot. Runs good for about two weeks and guauge starts rising. Changed thermostat. Flushed raditor, fans running good, coolant good. Could new radiator be needed.

    1. Wendy-

      Thank you for asking about your Honda Accord. Depending on the mileage on the vehicle, the water pump is another possibility as to why it would be running hot. A water pump that is just starting to go could not be pumping water/coolant properly but, circulate just enough to keep it from overheating immediately.

      Hope this helps!

      -BDP

  16. i have a 2005 honda civic. Recently the temperature gauge has been reading hot, all the way up passed the H. the engine however is not running hot at all. coolant levels are fine and i even have a bluetooth ODB code reader that shows the coolant temperature at around normal, nor am i getting any engine codes for the cooling system. at first i thought it might be the temperature sensor under the hood but now im just thinking the dial is stuck in the wrong position. when i turn the car off and all the other gauges including fuel drop down, the temperature one stays all the way up. any ideas or suggestions??

    1. Joseph-

      Thank you for asking about your Honda Civic. The fact that you are not getting any engine codes or warning indicators leads us to believe that it wouldn’t be a faulty temperature sensor. Have you noticed any issue with engine start up or have you experienced a lack of power? Please contact our technical support line at 888-863-0426 so that we can get a little better understanding of the vehicle’s condition and be able to make any appropriate recommendations.

      Thank you!

      -BDP

    1. Ross-

      It sounds like you are losing coolant very rapidly. Are you noticing any other symptoms? Please contact our technical support line at 888-863-0426 so that we can get a little better understanding of the vehicle’s condition and be able to make any appropriate recommendations.

      Thank you!

      -BDP

      1. My 2002 pt cruiser has been red lining the temp dial.. out of know after driving a bit the temp hand will start rising up pretty fast to the max, and il turn the heat wide open and try to hit a pot hole in case the thermostat is sticking and then the temp hand will go back to normal. This will happen at least once within a 20-30 min time frame. I’m not losing any water .. please help!

        1. Jessica-

          Thank you for asking about your PT Cruiser. Based on your description, a faulty thermostat is the likely culprit. The thermostat regulates your engine temperature. If antifreeze can’t flow through your radiator, the heat can’t disperse into the air as it should, causing the vehicle to over heat. Replacing the thermostat should solve your problem.

          Thank you!

          -BDP

  17. I got an 06 Chevy Malibu and when I drive it for a long period of time it won’t overheat but it’ll run hot and quit driving acting like it don’t wanna go anywhere.

    1. Trevion-

      Thank you for asking about your Chevy Malibu. Please contact our technical support line at 888-863-0426 so that we can get a little better understanding of the vehicle’s condition and be able to make any appropriate recommendations.

      Thank you!

      -BDP

  18. My 2006 Jeep has the 5.7 hemi and lately has been getting up to temp in less than 5 min of idling but never goes past normal running temp. I believe it is also sometimes causing the engine to stall if it heats too quickly. I’m thinking thermostat or a sensor any thoughts suggestions.

    1. Travis-

      Thank you for asking about your Jeep. If the thermostat was stuck closed, you would have an issue with overheating, not just getting up to normal operating temperature. Have you noticed any other symptoms? Please contact our technical support line at 888-863-0426 so that we can get a little better understanding of the vehicle’s condition and be able to make any appropriate recommendations.

      Thank you!

      -BDP

  19. I have a 2000 Dodge Durango, and when I drive my truck after an hour or two the temperature starts to increase. It never overheats though.. It will run at a low temperature for the first hour or so.. Then it will increase to about 210. Then it starts to drive funny and it has even smoked( that stopped when I got a new radiator cap) I don’t know what’s the problem. Any suggestions?

    1. Isaiah-

      Thank you for asking about your Dodge Durango. Have you noticed a loss of water/coolant? It’s possible the thermostat is becoming stuck at times, causing the rise in temperature. You can test the thermostat to make sure it is functioning properly by placing it in boiling water and testing to see it is opening up at the proper temperature. If not, replacing the thermostat would be your best bet.

      Thank you!

      -BDP

  20. Hi I have a 2013 Chevy Cruze and the tempature light comes on as soon as u start the car and the check eingine light is on… there seems to be no leak and the gauge goes to H but the car isn’t really hot like I said u can start it and it will start off saying it is hot what could this be thanks

    1. Laura-

      Thank you for asking about your Chevy Cruze. If it seems like coolant is flowing normally and you are not experiencing a leak, it may be an issue with temperature sensor being faulty. If coolant flow seems restricted, some possibilities as to why it would overheat are a faulty thermostat, water pump going bad or a clog in the cooling system.

      Hope this helps!

      -BDP

  21. I have a 2005 Honda Accord hybrid and it stalled out and when I press the gas the whole car looses power and won’t go and jerks and it’s only happened in weather over 105 degrees but the temperature gauge is not going up. What is wrong?

    1. Jeffrey-

      Thank you for asking about your Honda Accord. Have you noticed a loss of water/coolant? Please contact our technical support line at 888-863-0426 so that we can get a little better understanding of the vehicle’s condition and be able to make any appropriate recommendations.

      Thank you!

      -BDP

  22. I have a 01 Honda Accord V6 EX or LX Sedan. My cars temperature gauge (while driving) goes down to about 1/4 but then when i stop or go idle, the temperature gauge slowly goes right to the middle. Radiator fluid level is in between min and max also. And when i start my car I hear almost a bumbling noise that’s coming from the passenger side, (where i think maybe my water pump is at) behind the vents. Do you know what may be the cause?? I know a good bit about cars and i think it might be a sign or my car trying to tell me my waterpump is about to go or break very soon. Thank you so much, and i appreciate you taking the time to read my post.

    1. JD-

      Thank you for asking about your Honda Accord. Usually, if the temperature gauge shows the temp going down while driving, it is indicating the thermostat isn’t functioning properly and may be stuck open. We recommend replacing the thermostat.

      Thank you!

      -BDP

  23. Hi I have a 2011 Kia Sorento , About 98,000 Miles And Just recently my car started leaking coolant and the temperature gauge goes up all the way To the H , when I turn on the car all the coolant just falls out , do you know what this might be?? Thank you So Much!

    1. Mariana-

      Thank you for asking about your Kia Sorento. Are you able to locate where the coolant leak is coming from? With the amount of coolant it sounds like you are losing, and how quickly you are losing it, it’s possible you have a loose hose connection allowing coolant to spew out when the car is started. If you are unable to locate the leak, you may want to bring the vehicle in to a shop for an inspection.

      Thank you!

      -BDP

  24. Hello, I have a 2013 Buick Encore with 81000 miles on it.
    Well I have noticed puddles of coolant under my car, however the car does not over heat the temp gage does stay in the middle.No lights are on the dash.When I pop the hood to make sure there is still coolant inside I take the top off and the coolant will rise up and bubble not all the way back to the line though. so I just top it off.The car runs fine I just don’t know what’s the problem might be like what I might need to replace.

    1. Nj-

      Thank you for asking about your Buick Encore. Based on your description, it is possible that you are getting combustion/exhaust gases pumping back into the cooling system. You can use a “Block Dye Tester” to confirm whether or not that is the case. BlueDevil Head Gasket Sealer will still work if your vehicle is getting combustion/exhaust gases blowing into the cooling system and creating pressure. To give yourself the best overall chance of BlueDevil working successfully, in addition to the directions, you should remove the spark plug from the cylinder with the leak; this will be the spark plug from the cylinder with the low compression reading. If you are not sure which one that is, you may pull all of the spark plugs and will notice one will have a white-crystal-like substance on it and/or may look dirty; this is the plug you should pull. Leave that plug out for the 50 minute idle in order to relieve the pressure from building up and thus allowing the product to seal properly. Be sure to follow the guidelines for the proper amount to use based on the size of your cooling system.

      Thank you!

      -BDP

  25. Hello, I have a 2007 Mercury Mariner. We have a fair amount of snow right now so I have to drive 3-4 miles in Low to get out onto a main road. Recently I’ve noticed steam coming from the front end after driving in Low. The temp gauge does not indicate that the engine is overheating and I can shift to Drive and drive down the highway with no apparent problems. Coolant level is topped off and there don’t appear to be any leaks. I would welcome any suggestions.

    1. Wit’s end-

      Thank you for asking about your Mercury Mariner. Based on your description, it’s possible the steam is simply condensation from the snow melting off the front of the vehicle. If the coolant is reading at the proper level and the vehicle isn’t overheating, it doesn’t sound like you are experiencing any kind of a leak. Continue to monitor the situation and perhaps try testing the vehicle in areas where there is not as much snow to see if you can duplicate the steam.

      Thank you!

      -BDP

  26. Hi. I have a 2004 Toyota Sienna with 130,000 miles on it. When I’m driving, the temperature gauge is at half. AC and heat are fine when driving. When i park or stop at a red light, the temp rises quite quickly, the heat blows cold or the AC blows warm, and the fan is really loud. When driving resumes, the fan sounds normal and AC and heat work again once temp gauge hits half mark.

    1. Mike-

      Thank you for asking about your Toyota Sienna. Based on your description, the best place to start would be to check that the thermostat is functioning properly. It’s possible that it is sticking closed at stops, restricting circulation and causing the vehicle to start overheating. Replacing the thermostat should fix the problem in this case. Also, a cooling system flush would get rid of any jellied antifreeze or other debris stuck in the system, that could potentially be impeding flow. If neither works to solve the issue, your best bet may be to bring the vehicle in for a proper diagnosis.

      Thank you!

      -BDP

    1. Louis,

      Thanks for your question about your 1997 Chevy Lumina. Yes, it’s possible you’ve got a stuck thermostat or dirty cooling system. If your car heats up at a stop and blows cold air when the heat is on we would recommend starting by checking your coolant level as low coolant cause also causes that to happen. Similarly, we would recommend checking your cooling fans to make sure they are coming on when your car gets hot. If your cooling fans are broken your car will overheat while idling but you will still get heat from your ventilation system. If your cooling system is clean and your thermostat and cooling fans are working correctly then you may need a new water pump.

      Thanks again for your question!
      -BD Auto Pro

  27. 2006 Toyota Corolla. The temperature gauge is not going past the midpoint which is completely normal. It’s about 40 degrees outside. However, it seems that the gauge gets to the midpoint a lot quicker after sitting for awhile. Usually it takes about 5-10 minutes to get there. Now it gets there in about 3 minutes – or in a mile. I’m not using the heat, and the heat/AC is pointed at the midpoint.

    Is this a problem or am I overreacting? I had a car catch on fire almost 10 years ago and last week I was driving my father’s truck (it was 23 years old) and it caught fire. So sometimes I think I am little sensitive to stuff like this.

    1. Eric-

      Thank you for asking about your Toyota Corolla. Based on your description, it doesn’t sound like anything to be alarmed about. It would be a good idea to check your fluid levels to ensure you’re not low on coolant. If the temperature gauge goes to the midpoint and then starts to drop, it could be an issue with the thermostat.

      Thank you!

      -BDP

  28. my car will stall sometimes after i start it, the thermostat keeps going up and down, and i have no heat while the car is idling. what do you think the issue is?

    Adam

    1. Adam-

      Have you noticed a loss of water/coolant? It sounds like you may have some kind of a restriction in the cooling system not allowing proper circulation. Please contact our technical support line at 888-863-0426 so that we can get a little better understanding of the vehicle’s condition and be able to make any appropriate recommendations.

      Thank you!

      -BDP

  29. I own a Golf mk3 GS 1.8 ltr, My heat gauge goes on while the temperature stays at 75 degrees, what can be the problem? I’ve recently replaced my engine mountings and manifold (exhaust) gaskets my top gasket has also been replaced i have drained out the radiator and threw in clean coolant but my heat gauge light still goes on.

    1. NV-

      Thank you for asking about your Golf Mk3. Is it a low coolant indicator that is coming on? Is the needle on the temperature gauge going passed the half way mark or look like it is approaching overheating temperatures? Please contact our technical support line at 888-863-0426 so that we can get a little better understanding of the vehicle’s condition and be able to make any appropriate recommendations.

      Thank you!

      -BDP

  30. Hi, having a few issues with LS2 6.0ltr engine it making a pinging knocking noise, only happens when at full temperature and after driving for 30mins, it has been to my mechanic he struggled to diagnose this problem.
    Noticed the other day when I pulled the bonnet up it was very hot in the engine bay, hotter than normal but it’s not overheating on the temp gauge, it’s even melted the insulation on a couple of ignition leads, do you think this could be a faulty thermostat, temp sensor or water pump, or not the right ratio of coolant in the cooling system.

    1. Jason-

      Are you noticing a loss of water/coolant? The possibilities you’ve pointed out like a faulty thermostat or bad water pump would typically result in overheating. A faulty temp sensor is a possibility, as you’ve indicated the temp gauge isn’t reading as overheating. Does the oil appear chalky/milky? If water is getting into the engine oil, it would explain the knocking sound you are hearing. If you are noticing a loss of water/coolant, another area to check might be the spark plugs. They would appear with a white, crystal-like substance (crystallized antifreeze). Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!

      -BDP

  31. Hi i have ford explorer,When I go for drive about 10km,and when I open Engine i found Colanat reservior and colanat pump too hot but It show no anysign inside car everything is fine,guaze temp show normal temp..but I am worried is it normal or any issue…

    1. Ali-

      Thank you for asking about your Ford Explorer. If you are not getting any engine codes or warnings and the temp gauge seems to be reading normal, you may not have anything to worry about. Some manufacturers recommend replacing the water pump and flushing the cooling system every 90,000 miles, maybe something to look into. As long as you are keeping up with the routine maintenance and getting your vehicle serviced at regular intervals, you should be fine.

      Thank you!

      -BDP

  32. My mom has a 2008 Chevy Uplander. Couple months ago it started running hot regularly, smoking(steaming)under the hood Extensively and having to add coolant/water…blah blah…and the fans stopped working. at that point I was convinced we had a faulty thermostat or coolant temperature sensor so I purchased both. Possibly fan relay had went bad. Anyways I first replaced the coolant temp sensor and then this thing would be fine one second then only 1.5 miles after starting it up and driving the dash starts Dinging and displayed ENGINE COOLANT HOT A/C off for engine protection. So I pulled over…raised the hood…i could literally touch the motor but it wasn’t hot(rarely it would be hot) and after that for like a week every time we’d drive it the ENGINE COOLANT HOT indicator would always alert damn near constantly. Once I got up to speed and cruise at 55 at 1500 to 2500 rpm’s temp hand normal but as I’d have to accelerate to 3000rpm or more the temperature hand started rising rather quickly until it hit H. it always made me paranoid but every time I’d pull over and check the cover on motor usually barely felt warm at all. Annoying! Finally got around to replacing the thermostat a couple hours ago… I was sure it would be the remedy. I tester the vehicle and went to a store MAYBE 2 miles away and before I then made it there BAM! Engine coolant hot alert again 😥😥 WTF. Got home and got out of her van and I could hear the faintest sound of steam. Opened hood and searched for the source and I found its approximate location… Seems there might be a tiny hole in a certain portion of the radiator hose. Would a tiny penhole Be causing all of this crap? I’m frustrated. After replacing the radiator cap, temp sensor and thermostat I guess it’s time to buy new hoses for the radiator tomorrow. If anyone has any suggestions PLEASE HELP!! if not I might drive My mom’s mini-van over a cliff and have a bit of peace of mind finally 😂

    1. Terrance-

      Thank you for asking about your Mom’s Chevy Uplander. A tiny hole or crack in one of the radiator hoses could actually be creating the problems you’re experiencing. It’s possible air is trapped in the system and isn’t allowing the coolant to circulate properly, meaning it may not be able to flow through all parts of the system. If you can pinpoint the faulty hose, replace it and then bleed the system to get rid of all the excess air.

      Hopefully this helps!

      -BDP

  33. When driving my car for about 20 to 35 km the heat gage shows normal,then all of a sudden it became hot and the needle move to the red,stays there for a while and slowly move back to normal,and go to hot again.

    1. Pieter-

      Unfortunately, the issue you’ve described could happen for a number of different reasons. Are you noticing any other symptoms, such as a loss of water/coolant or smoke/steam coming out of the exhaust pipe? How many miles are on the vehicle? Have you ever had the cooling system flushed? Please contact our technical support line at 888-863-0426 so that we can get a little better understanding of the vehicle’s condition and be able to make any appropriate recommendations.

      Thank you!

      -BDP

  34. Hi,
    I have a Nissan March 2007, and of lately the temperature light is coming on. Now when I see it come on I pull aside turn off the car, and wait a few. When I open the radiator the coolant is full. So I switch back on the car and the light is off, so I start back driving. When I am almost home the light comes back on again, so I pull aside switch off the car for a few seconds switch it back on and the light is off, and I drove again and the light does not come back on. When I get home I leave the car to cool and I check the radiator, and it is still filled with coolant. Any idea what is going on? I have a gauge that was installed by the last owner who had to change the engine due to over heating, and she said if the needle crosses 90 the car is over heating. I always pay attention to the gauge, and during this the gauge does cross the 90 and goes either to 95 or 100 and stays around there. Buy as I said there is water in the radiator. I am stomped. And the COVID-19 has me stuck with no mechanic😔

    1. Yanns-

      Thank you for asking about your Nissan. With the vehicle not seemingly losing coolant, it’s possible that some type of restriction, although intermittent, is causing the vehicle to start overheating periodically. A faulty thermostat could cause the symptoms you are describing, as if it is getting stuck, it would restrict flow and cause overheating. That would be the best place to start. Depending on the mileage on the vehicle, it’s possible that it is due for a cooling system service and may need to be flushed.

      Thank you!

      -BDP

  35. My daughters car just started over heating yesterday that she knows of . She said it was overheating and smoking from under hood the smoke was white . Hi er car won’t even make it a mile before over heating again. Both the fans are working and it doesn’t seem to be losing water from anywhere ? Would it be the thermostat ?

    1. Misty-

      Thank you for asking about your Daughter’s vehicle. The white smoke/steam coming from under the hood sounds as though it is losing coolant and burning off. The thermostat would be a good place to start to see if it is functioning properly. Depending on how many miles are on the vehicle, the water pump may be faulty and could give you the symptoms you’re describing.

      Hope this helps!

      -BDP

  36. Hello,
    Looking for some advice on where to start with my 2013 Jeep Patriot.

    A few months ago I was driving and I noticed that after I turned the heat off in my car, the temperature gauge started to rise. Not overheat, but get to the 3/4 mark on the temperature gauge on the dash. After toying with the A/C and heat settings to figure out exactly when the temp goes up, I discovered that it happens when I dont have the heat OR the A/C on. So the temp guage gets up to the 3/4 mark if heat or AC is OFF during highway driving, slightly lower when driving in the city. I also noticed when idling, if I do not have either the AC or heat on, the engine or fan sounds louder. This all just started happening about 6 months ago. Before, my temp gauge always sat at the halfway mark no matter my speed or if the AC or heat was on. What is likely the problem?

    1. Mindy-

      Thank you for asking about your Jeep Patriot. Based on your description, the best place to start would be to check if the thermostat is functioning properly. A faulty thermostat or a thermostat that is sticking can cause the increase in temperature you are experiencing. Having the heat on would draw heat from the engine and help it from overheating, so this would explain why the temp is sitting at about the half way mark when you have the heat on. You can place the thermostat in boiling water to make sure it is opening up at the proper temperature. It may be a good idea to replace the thermostat, as this could lead to more issues down the road if it is faulty.

      Thank you!

      -BDP

  37. so I have a older car 2006 and I put coolant in and the fans work but the temp still goes up not over heating but still hot and the fans start running even when I haven’t even gotten far? Is that normal my car just runs hot ig not really much to explain.

    1. Aspyn-

      Did you add coolant because the system was low? Are you noticing a loss of water/coolant? If not, it’s possible that you have some kind of a restriction in the cooling system that isn’t allowing for proper flow. Based on the age of the vehicle, there are a few things you would want to check. The thermostat being faulty would cause the vehicle to start running hot. You can test the thermostat by placing it in boiling water to make sure it is opening at the proper temperature. If it isn’t, it would need to be replaced. A cooling system flush may be a good option for you, as this would ensure that the system is clean and that no jellied antifreeze or other debris are clogging or restricting flow. Also, most vehicle manufacturers recommend that the water pump is replaced every 90,000 miles. Depending on your mileage, this could also be a possible cause for the symptoms you’re having.

      Thank you!

      -BDP

  38. My car temperature guage goes to the red zone immediately i started the car . Engine not even hot yet and car have been parked for 2daya. Please whatia the cause and the solution to this.?

    1. Timothy-

      Did you get any warning lights or did the check engine light come on when this occurred? The most common reason for a vehicle to overheat, without having a coolant leak, is a faulty thermostat. A thermostat stuck closed would restrict the flow of coolant and cause the engine to overheat pretty quickly. Based on your description, however, the most likely possibility is a bad temp sensor. Typical symptoms of a bad engine coolant temp sensor include overheating, hard to start, vehicle idling poorly and the check engine light coming on. Replacing the faulty temp sensor should correct the problem.

      Thank you!

      -BDP

  39. Went to meineke and they look at my car and said that it was running hot because of the thermostat and the hose they fixed that and my car continued to say it was running hot so they check my temps on the car and said it actually wasn’t running hot that I have a wiring problem that’s cause it to read that it’s running hot what should I do I have no more money I’m out of 300 bucks that’s what they charged me and didn’t fix the problem

    1. Dominique-

      Unfortunately, your best option may be to bring the vehicle to a certified ASE mechanic for a proper diagnosis. The shop that just looked at your vehicle may have just been trouble shooting some possible causes with out actually diagnosing the vehicle or running diagnostic tests, as they may not have had the equipment/ resources available to do so. Bringing the vehicle in for a proper diagnosis will get you pointed in the right direction.

      Thank you!

      -BDP

  40. Yellow i like to have an advice about my chevrolet aveo 2008 model !!!!!! Now thise aveo its not averheating its only crack the water botle i buy botles evry time …the ( blue devil its work for what ?) And tel me how to stop the oil leak?

    1. Macala-

      Thank you for asking about your Chevy Aveo. Please contact our technical support line at 888-863-0426 so that we can get a little better understanding of the vehicle’s condition and be able to make any appropriate recommendations.

      Thank you!

      -BDP

  41. I have a 2001 grand prix gt and i relpace the ECT sensor thermostat ac/relay and jus put a new water pump and its still reading 260 n temp why is it still telling its hot after i done change all the components

    1. Robert-

      Thank you for asking about your Pontiac Grand Prix. Can you tell if the coolant seems to be flowing properly? With all the components you’ve replaced, one explanation could be that there is a partial clog in the cooling system, that doesn’t completely block flow, but is partial enough to cause the temperature to rise. You can try performing a cooling system flush and then making sure you don’t have any air pockets. If the problem persists, you may want to bring the vehicle to a certified ASE mechanic for a proper diagnosis.

      Thank you!

      -BDP

  42. I have a 1995 6.5l diesel. After a short distance of driving; the temp gauge goes. Almost all the way to H.. But then within a minute it comes back down to about the 1/4 mark, and will fluctuate between the 1/4 mark and the 1/2 mark..
    Seems to only spit coolant out the breather tube if i fill it to the cold fill line before i start driving.. Seems to level itself off, and wont leak anymore after it does this once.. But; the low coolant light stays on..
    Thermostat is new.. Thinking maybe fan clutch is faulty, or the fan clutch relay is dead..?

    Also, the vents inside fluctuate in temperature.. Goes from almost scalding hot, to room temperature every few minutes. And, rad cap, and coolant is cool to the touch after a few hours of running

    1. Steve-

      Based on your description, the vehicle may have an issue with coolant flowing properly.If you haven’t done so already, we recommend flushing the cooling system with a chemical flushing agent to get the system nice and clean. If the issue persists, you can try using a block-dye test to confirm whether or not you have combustion/exhaust gases pumping into the cooling system.

      Thank you!

      -BDP

  43. Hello, 2005 Nissan Altima, out of the blue my heat hand started getting pretty high. About 3/4 up and when I pulled over and shut the car off I heard a bubbling sound and it was smoke/steam coming from the water Reservoir. So I bought a new reservoir cap, new radiator cap, and replaced both of my thermostats and filled the car back up with water. After about 15 minutes of driving my heat hand is still fluctuating. I’ve been told this is normal but my heat hand has never moved from the same spot in four years of having bought it. So to me this is not normal, just figuring out what else I should try

    1. Adriannah-

      Thank you for asking about your Nissan Altima. From the sounds of it, you may have an air pocket trapped in the cooling system, causing the temperature hand to fluctuate. We recommend bleeding the cooling system down. This will alleviate any air stuck in the system.

      Thank you!

      -BDP

  44. I have a Chevy s10. I was told the max temperature is 190. But when I have to make a quick stop after being on the road for a while, and go to start it up, the temp gauge reads 210 or slightly higher. I’ve already replaced the engine due to overheating, and everything has been replaced in except the radiator. Am I being paranoid or is there another issue that

    1. Marc-

      Thank you for asking about your Chevy S-10. Was the vehicle overheating or is the temperature gauge reading just a little higher than normal? Normal operating temperature in most gasoline engine vehicle’s will range from about 190-210. If you are not getting a check engine light or indicator on the dash, you should be good to go.

      Thank you!

      -BDP

  45. When my car is parked the car is fine as soon as we start driving, it start going up to hot. What can be the problem.

    1. Rhinda-

      Are you noticing a loss of water/coolant? Are you noticing any other symptoms? Please contact our technical support line at 888-863-0426 so that we can get a little better understanding of the vehicle’s condition and be able to make any appropriate recommendations.

      Thank you!

      -BDP

  46. My car starts out by running hot for about 5-10 mins(can overheat if I try running it). Then it cools down back to normal temperatures and doesn’t act up. What could the issue be.

    1. William-

      After the vehicle warms up, are you saying that there is no issue what so ever? Based on your description, it sounds like you may have an intense amount of pressure building up when you first start the vehicle, until the thermostat opens up and allows coolant to flow freely. We recommend having the cooling system serviced, using a radiator flush to make sure that the system is thoroughly clean and that no foreign debris/jellied antifreeze can restrict circulation. Also, try bleeding the system to make sure all excess air is removed.

      Hope this helps!

      -BDP

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