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Discussion Starter · #1 ·
My 2004 wrx has been overheating at low speeds / at idle. Today, I burped the system and it was idling properly for a while. I went out for a drive and then I noticed it was heating up again at idle. I'm thinking maybe a thermostat or fan issue? I'm really hoping it's not a head gasket. Anything helps! Thanks
 

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If you have circulation it's not the thermostat. Check for circulation first.
 

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Discussion Starter · #3 ·
Oh and the thermostat goes up and down sporadically. It doesn't just go straight up to hot, it goes up slowly and drops quickly and then goes back up.
 
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