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99 Forester
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Hello all, just got a 99 a week ago and noticed tonight that it was overheating. Haven't noticed any bubbles coming from in the resivoir to indicate headgasket failure, fans are turning on and trying to cool but not. I suspect the thermostat. I'm new to subies so what are the trouble shooting steps to correct this. Thanks
 

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2009 Forester X Premium
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3,121 Posts
Check your fluid levels in the radiator and expansion tank. If their full you may have air pocket in the cooling system or a bad radiator cap or possibly the t'stat. I don't think there's any easy way to test the thermostat without actually removing it from the car, but you could run the car from a cold condition with the radiator cap off and see if the coolant is circulating and actually gets warm I suppose.
 

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03X MT
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847 Posts
Overheating?

Temperature gauge reading?
Blowing coolant?

HG failure can be either internal or external.

Internal=exhaust port to coolant port. Coolant to oil.

External=signs of coolant outside the engine.

Don't be fooled into thinking the t-stat is stuck closed. The lower hose where the t-stat is located can feel cold even during an episode of overheating since the circulation has been disrupted.

Less expensive things to try first

Replace/remove t-stat
replace rad cap
 
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