Question about 1993 Toyota Previa

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Overheating van help needed thanx

My estima is overheating,not sure if it is the head gasket or just the radiator,the temp drops when A/C and fan is on full,but still uses alot of water.checked to see if the oil was milky but it looked sweet,could do with a hand THANX.

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  • Anonymous Nov 11, 2008

    it gets hi tempture ,no hot air from defrost or vents


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Is the water being lost out of your overflow or from somewhere else? Your water pump may need to be replaced if the water is coming from your pump. If the water is being lost from your overflow, even when you first start the car and drive it cold, it most likely is compression gas blowing past your head gasket. If you lose no water for the first few minutes of driving until the engine gets warm, then it may be venting from over heating from another problem and not your head gasket.

Check for leaks.

It's odd that the temperature drops when the A/C is on. Your electric fans should be running when the A/C is on and when the water temperature rises. Check your fans when the engine is hot and the A/C is off. Also make sure the cooling system is full when you do this or a thermal switch may not sense the hot temperature. If your fans don't run, it could be a bad fan or switch. Turn on the A/C. Both fans should be running.

Check for debris/blockage of your radiator. If the "fins" are smashed or matted, the radiator won't funcion properly. You can try to "comb" them straight or replace it. Also check for evidence of sludge within your radiator.

Try replacing your thermostat. It is most likely no good anyway since it's been exposed to several overheatings and could possibly be the original culprit of your problem.

Come back with your findings.

Posted on Sep 26, 2008

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