Quote:
Originally Posted by 05S80AWD
Could the thermostat being stuck cause the fan to run constant with a cold engine?
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Yes it does, if the engine temp doesn't climb at the rate the ECU expects then it will turn on the fan as a fail safe, this means that with a stat that's stuck open your end up over cooling an already cold engine! - Been there, done it, only on mine it did thow a fault code (P0115) which was picked up with a generic OBD-II reader - Mike