Question about 1993 Subaru Legacy

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1990 Subaru Liberty Overheats

I have a 1990 Subaru Liberty Wagon that overheats in a strange way. Ok here what I have replaced so far but the problem doesn't go away.
Heads have been rebuilt, new head gasket, new water pump, new thermostat, new radiator, new hoses, new radiator cap. Water system has been bleed and there is no air in the system, water flows nicely through the raditor. Fans come on just under half temp and run the right way.
I can drive the car with no overheating problem and then next time it overheats for no reason. The strange thing is it overheats while just cruzing along and when you rev the motor or put under load going up a hill the temp guage drops under half. You leave the car idle over for an hour and no overheating. I don't understand why underload the temp goes down. I can sometimes drive the car for an hour and nothing happens, take the cap off radiator and water is fine. Then another time it overheats, take the car off radiator and water is boiling over.

Has anyone got an answer as I am about to give up on this!!! Have been reading about air locks in system??? but I have done everything everyone has said to bleed the air out.

Posted by mb168 on


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I had the same problem with my 1993 Liberty LX. Remove the thermostat (located inside bottom radiator hose engine connection - take the connection off and thermostat is inside). Reassemble (minus thermostat), reconnect bottom hose. Slowly (very, very slowly) refill the radiator and remove the bleed plug ( located beside the top hose connection to the radiator - a black square plug with a phillips head cross in the middle). When the radiator is full and clear water (no air bubbles) is coming out of the bleed point, replace the bleed plug and then the radiator cap.

Run the engine for five minutes (approx) or until normal engine temperature is reached. Allow the engine to cool down and recheck the water level - fill if necessary ensuring that the bleed plug is open and clear water is coming out of that point. Replace Bleed plug and then radiator cap. Run engine for five minutes (approx) and then test dive. If the engine overheats keep filling the radiator until there are no air bubbles coming from out of the bleed point.

This fixed my overheating problem. Good luck and safe motoring.

Posted on Sep 21, 2008


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