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engine compartment fan

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off-late I've been noticing something strange about the engine compartment fan. Until recently I've never observed it running. Guessing that it would run only when the engine bay is sufficiently hot and then turns off when I turn the engine off and so never had a chance to hear it operate. But a few times recently, I notice something strange. I go on a long drive, come park and turn the engine off, ignition off and all silent. I turn the ignition on and the fan doesnt run. I let it sit for a while (10-15 minutes) and then turn the ignition on again and the fan starts whirring wildly. Now if anything, the engine bay should've gotten cooler in that time. So why this? Ofcouse its summer here in the san francisco bay area but it barely hits 100 and so that cant be it.

Any clues?

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The fan can run after the key has been removed, even if the fan was not on while your were driving around . It is called heat soak or something like that.

But do as Loren said and check to see if the temp sensor is where it should be.

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Thanks for the suggestions guys. I havent gotten to this yet. Will update the thread when I get to it.

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..so the temperature sensor does seem to be in place. Its the one between the intake runners right?

I do seem to notice another issue at cold start that I'll start off as another thread

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