Where is the Antifreeze Leaking From My Engine?


antifreeze, antifreeze leakWhere is the Antifreezing Leaking from my engine!?! Having a leak can be extremely frustrating, but having an antifreeze leak can is the worst.  Antifreeze leaks can be so difficult to find because the antifreeze runs all over and gets blown around by the wind and your engine cooling fan until everything is a bit wet and you’re confused.

Antifreeze leaks are also the worst because they are often relatively quick leaks that can allow your engine to run out of coolant fairly quickly.  A low antifreeze level means overheating and overheating can mean engine damage so you want to stay far away from that! Antifreeze leaks are the most common cause, but there are a few other reasons your engine may be overheating.

Finding an antifreeze leak is tough because antifreeze is running all over your car:

Where is the Antifreeze Leaking From My Engine?

  • Thermostat housing
  • Upper or lower radiator hose
  • Heater core hoses
  • Oil cooler
  • Transmission cooler
  • Water pump
  • Intake manifold
  • Throttle body
  • Engine block water jacket
  • Timing cover

So where do we start??

Finding a cooling system leak should almost always start with a system pressure test.  Many auto parts stores will loan this tool out to help you find the leak in your system.  Besides the pressure test kit, you may also need additional coolant, a bright flashlight, a mirror and it can be helpful to have compressed air to blow on your engine around possible leaks points to dry them off quickly so you can see even the smallest of leaks.

If the leak is so small you can’t find it using a pressure test, you can always step up to a UV dye test.

For most of the possible antifreeze leak locations in your vehicle, the best thing to do is simply replace the leaking component.  Radiator, cooler, or heater core hoses are usually very inexpensive and can be changed simply with a pair of pliers and a flathead screwdriver.  Similarly, leaking thermostat housings or water pumps can be fixed with simple o-rings or gaskets which again are relatively inexpensive.

There are 2 places where antifreeze leaking from my engine could make me consider a less expensive repair.  A leaking radiator or leaking engine block. Replacing either of these components can add up to hefty repair bills which may not be worth completing on your car.  If the hard part repair doesn’t make sense for you on a leaking radiator or engine block, consider using BlueDevil Radiator and Block Sealer to seal the leak without having to replace any parts!  BlueDevil Radiator and Block Sealer is easy to use and provides a guaranteed repair!







You can pick up BlueDevil Radiator and Block Sealer at one of your local auto parts stores like:

  • AutoZone
  • Advance Auto Parts
  • Bennett Auto Supply
  • CarQuest Auto Parts
  • NAPA Auto Parts
  • O’Reilly Auto Parts
  • Pep Boys
  • Fast Track
  • Bumper to Bumper Auto Parts Specialists
  • S&E Quick Lube Distributor
  • DYK Automotive
  • Fisher Auto Parts stores
  • Auto Plus Auto Parts stores
  • Hovis Auto & Truck Supply stores
  • Salvo Auto Parts
  • Advantage Auto Stores
  • Genuine Auto Parts stores
  • Bond Auto Parts stores
  • Tidewater Fleet Supply
  • Bumper to Bumper Auto Parts
  • Any Part Auto Parts
  • Consumer Auto Parts

Pictures Provided By:

antifreeze_leak.jpg – By Nikkytok – Licensed by Getty Images – Original Link


6 responses to "Where is the Antifreeze Leaking From My Engine?"


  1. Shane on July 24, 2019 at 9:51 pm

    Im working on an 06 Nissan Altima belonging to a family member that has a coolant addiction. Everywhere I looked on the web people were all over Blue Devil as the best chance of repairing blown head gaskets. The inside floor is dry and all around the engine and components is dry too. The car isnt getting past half temp either. Once you turn the car off it’s almost impossible to start. I noticed the top radiator hose was rock solid even when the engine has cooled when I went to recover the vehicle and the other day, when the car refused to start, I noticed the same and carefully depressurised the cooling system and after 3 attempts it fired. It always idles rough like 2 or 3 cylinders of the 4 are firing then it picks up. The car runs sweet and the engine is quiet. I assumed blown head gasket and ordered a block tester. So confident I was on the right track I also order the 32 Oz bottle of Blue Devil Head Gasket Sealer ( Yellow Label ). The block tester came back negative! So now I’m down to intake manifold leak I guess. As I have bought new thermostats and Blue Devil Radiator Flush my question is…. Since the Blue Devil I bought does Heads, Heater Cores and Freeze Plugs will it also seal intake manifold leaks?



    • BlueDevil Pro on July 25, 2019 at 8:51 am


      Thank you for asking about your Nissan Altima. Yes, the BlueDevil Head Gasket Sealer would be able to treat leaking intake manifold gaskets as well. As long as you are not losing coolant too quickly, and the vehicle will maintain idle for a full 50 minutes without overheating or stalling out, you would be a good candidate for the product. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!


  2. Gabriel on July 26, 2019 at 1:03 pm

    My volvo 2006 s60 was loosing coolant every other day and couldn’t find any leak. Finally I checked the oil and it was like a coffee and milk and over the limit , same the top cap where you pour the oil. So I figured out the coolant is leaking into the engine probably because a blown gasket. Should I empty the contaminated oil , replace with new oil and use this Blue devil or it wont work and is better to just take it to a mechanic /

    • BlueDevil Pro on July 26, 2019 at 2:14 pm


      Thank you for asking about your Volvo S60. Unfortunately, water/coolant getting into the engine oil would be a tell-tale sign of a blown head gasket, however, it is exactly the kind of leak the BlueDevil Head Gasket Sealer is intended for. You would want to change the oil and replace with new oil before and after the BlueDevil procedure. Feel free to contact our technical support line at 888-863-0426 with any other questions.

      Thank you!


  3. Augustine Garcia on April 29, 2020 at 10:54 am

    Hello, I have a 2005 Nissan Murano and I can see that it consumes oil and a little liquing in the engine gasket head, and also that when warm it up for 10 minutes and leaking a little antifreeze. What bluedevil products do you recommend me and should I apply one to repair the engine gaskets and another to stop the antifreeze dripping? please if you can give me information thanks.

    • BlueDevil Pro on April 29, 2020 at 3:17 pm


      Thank you for asking about your Nissan Murano. Is the car burning oil? When you say liquid in the engine head gasket, are you referring to oil or antifreeze? 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!


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