Find your symptoms or Find your product:

Whether you've discovered a leak, been diagnosed with a blown head gasket or you've begun hearing an unidentifiable noise, BlueDevil Products is here to help! Easily search our list of symptoms to discover options for your problem.

Know exactly what product you need? Head on over to the products page for more information, videos, product directions and more!


Head Gasket Problems

What are bad head gasket symptoms?

It’s important to learn what head gasket failure symptoms look like to avoid higher expenses due to additional engine damage caused by driving with a blown head gasket. Some bad head gasket symptoms include:

  • Coolant leaking externally from below the exhaust manifold
  • White smoke from the exhaust pipe
  • Bubbles in the radiator or coolant overflow tank
  • Overheating engine
  • White milky oil
  • Fouled spark plugs
  • Low cooling system integrity

Can I drive with a blown head gasket?

If you have multiple blown head gasket symptoms, it is important to drive your vehicle as little as possible. The hot gases and cold coolant moving through the hole in the gasket can quickly erode or warp the metal head or engine block. This can leave leaving you with costly machining bills or even the need having to purchase new heads or a new engine. Having water in your engine oil can destroy bearings quickly.

Head Gasket Repair 00212

Head Gasket Sealer 38386

Pour-N-Go Head Gasket Sealer 00209


What are bad head gasket symptoms?

Power steering problems can happen for a variety of reasons. One of the most common problems power steering systems have is leaks. If you find a leak in the steering gear, rack, or power steering pump, use BlueDevil Power Steering Stop Leak to seal the leak. Another common symptom to look out for is a power steering noise. This whining noise in your car can be subtle or extremely loud and maybe worse in colder weather, or right when you first start your car. Some other problems may include:

  • Worn Pump
  • Air in the system
  • Clog in the system

PRO Universal Leak Repair 00241

Power Steering Stop Leak 00232


What is coolant?

The internal combustion uses heat to expand gases, which move the engine’s pistons (and your vehicle). Therefore, there will always be leftover heat after each cycle. This excess heat needs to be removed to keep your engine from overheating. The more quickly this excess heat can be removed, the more efficient the engine will be.

What should my coolant temperature be?

Different vehicles are designed to operate at different temperatures to protect the engine and its components as well as allow it to operate at maximum efficiency. The coolant temperature is controlled by two things: your vehicle’s thermostat and the engine’s cooling fans. Most engines are designed to run with coolant temperatures between 160 degrees and 200 degrees.

What is a head gasket coolant leak?

When you have a blown head gasket, it allows one or more of these fluids or gases to get to a place they shouldn’t be. A blown head gasket can allow combustion gases to get into your coolant or allow engine coolant to get into the combustion space or oil. It may also let engine oil get in all these places as well.

Radiator Flush & Oil Degreaser 00203

Head Gasket Repair 00212

Coolant Stop Leak 00211

Engine Cool 00207

Head Gasket Sealer 38386

Pour-N-Go Head Gasket Sealer 00209

Radiator & Block Sealer 00205


How long can radiator flush be left in?

The BlueDevil Radiator Flush would not be acting as antifreeze, so it should be drained out and refilled with your regular antifreeze mixture. For extended cleaning, you can drive the vehicle for 3-6 hours with the flush in the system. Do not let the cooling system temperature fall below 32 degrees F.

Can you put radiator stop leak in a diesel?

BlueDevil Coolant Stop Leak is compatible with gasoline and diesel engines. it’s safe for Northstar engines and guaranteed to help seal any leaks in and around your cooling system.

Radiator Flush & Oil Degreaser 00203

Radiator Flush 00204


Why is coolant overflowing from radiator?

If the overflow tank is too full coolant will spill out of that reservoir and may look like a leak. If this is the case, you should only see coolant overflowing the tank 1 or 2 times and after that, the excess coolant will be removed from the system and you shouldn’t see any more overflow.

How can I fix a leaking radiator heating core?

Fixing a leaking radiator heating core will always be much easier than replacing one. Since it is only a small leak in the heater core, we recommend simply sealing that leak and leaving your heater core in place. You can do this by simply adding BlueDevil Pour-N-Go to your vehicle’s radiator when your vehicle is cold. When BlueDevil Pour-N-Go reaches the leak point, the temperature differential will cause a chemical weld to form sealing your leak without affecting any other part of your cooling system.

Head Gasket Repair 00212

Coolant Stop Leak 00211

Head Gasket Sealer 38386

Pour-N-Go Head Gasket Sealer 00209

Radiator & Block Sealer 00205


How do you fix a hydraulic fluid leak?

If you notice a loss of power or have a leak in your system, the best way to fix your problem is to use BlueDevil Hydraulic Stop Leak. BlueDevil Hydraulic Stop Leak is a unique plasticizer that does not contain petroleum distillates. It will absorb into the seals in your hydraulic system restoring them back to their original size and flexibility without clogging or harming other components in any way. BlueDevil Hydraulic Stop Leak will mix with the hydraulic fluid in your system and can stay there permanently, or even be retreated.

Hydraulic Stop Leak 00238 / 00239


What are the signs of a cracked or blown head gasket?

An external head gasket leak causes coolant to come up from the intake or exhaust manifold and often happens when the engine is completely warmed up. Most head gasket leaks are internal and allow coolant to flow into the combustion chamber on every intake stroke. When this happens, coolant burns with the combustion process and appears as white smoke coming from the tailpipe. Some other signs of a blown head gasket are:

  • Bubbles in the radiator or coolant overflow tank
  • Overheating engine
  • White milky oil
  • Fouled spark plugs
  • Low cooling system integrity

Is driving with a cracked engine block okay?

No! If you have multiple blown head gasket symptoms, it’s important to drive as little as possible!

What is cracked engine block sealant?

The best way to seal a cracked block is to use BlueDevil Radiator and Block Sealer. BlueDevil Radiator and Block Sealer is a specially formulated sealing agent that you add to your vehicle’s cooling system. BlueDevil Radiator and Block Sealer can seal your cracked block from the inside out through your vehicle’s cooling system.

Head Gasket Repair 00212

Head Gasket Sealer 38386

Pour-N-Go Head Gasket Sealer 00209

Radiator & Block Sealer 00205


Why is my car air conditioner blowing hot air?

The condenser in your air condition system looks a lot like a radiator and is mounted at the front of your vehicle. It is used to cool the hot compressed refrigerant back to ambient temperature as it comes from your compressor and uses the air your car is traveling through to do that. If not, the refrigerant will still be hot when it travels through the expansion valve. When that happens, the hot refrigerant will only be cooled back down to ambient temperature, so your AC won’t work. Since the condenser is at the front of your vehicle, it can get clogged by all kinds of road debris.

How to find a leak in car air conditioner?

The most common practice is to add a special dye to the air conditioning system. This dye is usually very difficult to see with the naked eye but will glow brightly when illuminated by an ultraviolet (UV) light. To discover where your refrigerant leak is coming from, add UV dye to your air conditioning system and enough refrigerant to ensure the compressor turns on. While the engine is running, have a friend turn on the air conditioning and blower. While he turns the AC on, watch the front of the compressor in your engine bay. The belt should always be spinning the AC compressor pulley, but right when the AC is turned on, the front of the compressor pulley should begin to turn as well. If you can see this happen, then you can ensure refrigerant, and your newly added dye is circulating through your air conditioning system.

Why is my car air conditioner fan not working?

Your car air conditioner fan not working is a common problem and a relatively easy fix without having to bring your car to the repair shop. If you are getting no air from the ventilation system in your car, you might not have a problem with your air conditioning system at all! If you’re getting air to blow but it’s not getting cold, that’s a different problem but hopefully still an easy fix.

A/C Stop Leak Multi-Application System 00223

Oil Injector 00224

A/C Stop Leak 49496

A/C Refrigerant Stop Leak 00222


How much does an oil leak cost to fix?

Depending on the type of vehicle you have, the engine that is in it, and the location of the oil leak, repair costs can range from as little as $150 to as much as $1200. Since oil leaks can be so destructive, the cost of repairing the leak is almost always worth it to make sure your car stays running and doesn’t leave you stranded or worse. Oil leak repair cost has a lot to do with where the oil leak is located. The oil seals and gaskets in your car are made from relatively common materials and replacements are easy to find and often made by multiple manufacturers which helps keep the cost down to $5-$30 for parts.

Is a rear main seal oil leak bad?

If you’ve got a rear main seal leak you will have oil dripping off either your engine oil pan or the front of your transmission called the bell housing. A rear main seal leak can cause some big problems in your vehicle. To make things worse, replacing a rear main seal can be one of the most expensive jobs you can do on your car next to replacing the head gaskets or rebuilding your transmission. If you’ve got a rear main seal leak you will have oil dripping off either your engine oil pan or the front of your transmission called the bell housing.

How to stop an oil leak in a car?

An easy and sure-fire oil leak repair, no matter where it’s coming from is to add BlueDevil Oil Leak Sealer to your engine oil. You can add BlueDevil Oil Leak Stop today and seal your oil leaks as you drive your car. In two days or less, any seeping or dripping leak will be permanently sealed, guaranteed!

Stop Smoke & Engine Repair 00243

PRO Universal Leak Repair 00241

Oil Stop Leak 49499

Rear Main Sealer 00234


What causes an automatic transmission to shift hard?

There are a few things that can cause an automatic transmission to shift hard. Each requires slightly different solutions.

  • A Worn-Out Transmission
  • Old/Wrong Transmission Fluid
  • Low Fluid Levels
  • Faulty Torque Converter
  • Your Transmission Is Worn-Out

Worst case scenario, your transmission is worn out. The bands and clutches that cause gear changes wear down over time and as a result, their surfaces become smooth and no longer hold things together. Unfortunately, you’ll have to remove your transmission to test this. At that point, you might as well replace your transmission.

How to stop transmission leak?

If you discover a leak from a gasket or seal in your transmission, the best way to stop the leak is to simply add BlueDevil Transmission Sealer to your transmission fluid. BlueDevil Transmission Sealer can quickly seal a leaking seal or gasket stopping your automatic transmission leak and keeping your car working properly.

Transmission Sealer 00236