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I've had some cooling system issues lately and im thinking that it might be the thermostat...where is it and what else should i do when i replace it? Also what is a good method for flushing the cooling system on this engine? Does the overflow tank on the right hand side of the radiator flow back into the cooling system or does the coolant just sit in it?
 

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becareful as the car will heat fast. get rid of the air bubbles if you can. I changed my hoses to samco and did a critical thermistat as well as there cap. They offered a kit last year. Some like the critical thermistat and others sware about them.
 

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seriously, spend the time to burp your coolant system properly...if you don't know what this means, you must find out and know it prior to attempting to working on your radiator.

A tiny air bubble in my system resulted in redline of the temp gauge in less than 10 miles of driving. Totally freaked me out and not too good for the engine.
 

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How do you burp the cooling system? My 98 Cavalier has a little cap that you remove, real easy. But I can’t find any vent valves on the Subaru WRX. It’s a 05.
 

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you take the coolant hoses and massage them (ie squeeze), with the rad cap off, you can see the coolant level go down w/ every "burp"...I would do this fo about 30 minutes to 45 minutes, until the coolant level stops dropping...it helps to have a friend stand there and make fun of you...

after driving for a few days, you should check the level again.
 
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