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Mazda Ed
Mazda Ed, Auto Service Technician
Category: Car
Satisfied Customers: 2223
Experience:  ASE Master Technician, Mazda Master Technician, GM and Ford factory trained. 15 years experience!
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1998 subaru forester: 20 minutes..radiator..engine leaking

Resolved Question:


I have a 1998 subaru forester with 86000 miles. The car over heats after about 20 minutes driving,but the radiator stays cold, so there is no flow of coolant to the engine block. There is no leaking of coolant. The radiator cap and thermostat was changed by a mechanic, but that did not help.
Please addvise.

Submitted: 7 years ago.
Category: Car
Expert:  Mazda Ed replied 7 years ago.



Sorry to say but this is a common symptom with a blown headgasket on your car. You can verify that the headgasket is bad by performing a combustion gas leak check. The tools to do this can be purchased for about $50.00 It basically involves sucking fumes through a liquid at the radiator cap and looking for a change in the color of the liquid.

Customer: replied 7 years ago.
the car has a rebuilt engine, headgaskets are fine. no leaks or steam in the exhaust.
Expert:  Mazda Ed replied 7 years ago.

Without performing a combustion leak check you cannot verify that the headgaskets are fine. The compression from the engine can be pushing air into the cooling system. This air can create a pocket behind the thermostat which would not allow it to open and thus cause an overheat problem.


It's also possible to have a cracked head. Depending on the quality of the rebuilder, they may have just installed some new gaskets and never checked the head.

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