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If a 1995 3.1 Olds engine seems to have air in the cooling system how do you purge it?
Wiki User
∙ 8y ago
Regarding the problem of air in the cooling system, the proper filling prodedure can be found in the owners manual. If you don't have one, it's a simple matter of starting with the engine cold. Locate the cooling system bleed valve. It is usually on the top of the thermostat housing. When you have located the bleed valve, carefully open it one or two turns by holding the locknut with a wrench and loosening the brass screw with a common screwdriver. With the bleed valve open, fill the radiator through the neck until full or until a small amount of coolant appears at the bleed valve. The close the bleed valve, and fill the radiator completely through the neck. Put the Radiator cap on and fill the cooling system overflow/recovery tank to the proper level markings on the side of the tank. Start the engine and check for leaks etc, while letting the engine warm up. Watch the temperature lights, gauge to ensure that the engine doesn't overheat in the event of airlock.
If you have completed this procedure and still feel that there is air in the system, repeat this procedure after letting the engine cool down completely. Try to locate where the leak is. If air is getting in, coolant is getting out.
The bleed screw can be opened slightly or "cracked" while the engine is running to release additional air trappped in the system, however it is not recommended, due to the obvious concerns regarding hot steam, burns, and safety.
Coolant Type - It is very important to use a good quality GM approved coolant. Do not operate this engine for any length of time with the radiator filled with pure water. Using water may cause Head Gasket failure and severe engine drivetrain damage.
Wiki User
∙ 8y ago
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