How to Repair a Cooling System Water Pump Head Gasket

What You'll Need
Replacement coolant
Drainage container
Engine block sealant
Sealed container

The cooling system water pump head gasket is important to keep any engine’s temperature under control. If an engine overheats or is involved in any type of trauma it can distort the metal of the gaskets and cause them to crack. A cracked gasket can lead to further damage to the engine and the car overall. While it is a big job to try and replace the head gasket completely, there are temporary fixes you can do to buy some time. The following is one way to temporarily repair he head gasket in a cooling system water pump.


It is important to remember this is only a temporary fix. A new head gasket will eventually be needed but this method will safely allow the vehicle to continue to perform at maximum capacity until the repair can be made.

Step 1 – Drain the Coolant

Before you can do any work to repair the head gasket, the coolant must be drained from the radiator. Prior to attempting any work on the car engine you should allow the car to sit for at least 30 minutes to sufficiently cool down. Once the engine has cooled, you can drain the radiator through the valve underneath the car. Drain all of the coolant into the drainage pan and then transfer it into a sealed container for disposal. Be sure to dispose of the coolant safely at any mechanic’s garage.

Step 2 – Apply the Sealant

The next step is to pour in the engine block sealant. It should be mixed with water before you pour it into the radiator according to the particular guidelines of the sealant you are using. When the sealant fills in the cracks in the gasket it will form into a hard glass substance that will seal the crack sufficiently. Once it has been added, you will need to allow the engine to idle for another 30 minutes so the sealant can cover the entire surface area of the engine.

Step 3 – Allow the Sealant to Form

The vehicle will need to be driven over the next day with only the block sealant in the radiator to allow it to fill in the gasket cracks completely. The engine may tend to run hot during this time but as long as it doesn’t run too hot for too long there will be no damage done. After the day of driving be sure to allow the car to sit and cool overnight before the next step.

Step 4 – New Coolant

The last thing you will need to do is basically repeat the first two steps only this time you will drain the block sealant completely and then refill the radiator with coolant. Be sure to take the same steps to dispose of the sealant as you did the coolant for safety reasons. The new coolant should work just as it always did now that the crack in the gasket has been temporarily filled.