Question about Subaru GL

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Car is overheating, - exchanged the thermostat but it didnt solve the problem, - heater is working fine - radiator liquid is vanishing - pressure difference in the cylinders is about 10% - What could it be (my guess: waterpump, radiator or headgasket) and how can I test it before I replace the thing? Cheers

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One thing you can try is called "Liquid Glass". You add this stuff as per directions and the seal and repair is permanent. This stuff is worth the money and has worked well in repairs that I have done personally. Now, please keep i mind that there are always variables that do exist. If the water pump has an issue you would not have a good heater. I personally would do a chemical flush first so that if there is a blockage in the radiator it may flush it out. Refill and then refill with coolant, distilled water and the sealant. It is likely leaking near the exhaust side and going out of the exhaust concealing the leak. Let me know how it works.

Posted on Oct 24, 2010

  • nkriegisch Oct 24, 2010

    thank you very much for your prompt answer, that sounds very good. I bought the sodium silicate and will try it as soon as the car is cool again, hopefully it works!!! I will let you know.

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10% pressure difference is normal, but not conclusive. If it is head gasket, you would see bubbles coming up the radiator when the cap is off and the engine is running. And if you are losing coolant thru the head gasket, the exhaust would be wet and smell like glycol. If it was the radiator, there would be a lack of flow. The top hose would get hard and the bottom one soft, and you would probably see a lot of gunk in the radiator. If it was the waterpump, you would not see flow with the radiator cap off. My guess is a small leak in the head gasket or maybe a small crack in the head. That is the only thing that explains vnaishing coolant. If you have more questions, please let us know.

Posted on Oct 24, 2010

  • nkriegisch Oct 24, 2010

    thanks a lot for your prompt answer, you are probably right with the small leak of the gasket as we "tested around" a little bit more and there were indeed bubbles coming up.

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