blower motor fan question

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I have a '96 Chevy Astro Van that the blower motor fan turns on by itself when the van is off. It had never done it before until a few weeks ago. I've been told it could be a relay. Any suggestions?

posted by  chris713

What's the weather like? If it's warm out where you are, there may not be anything wrong with it. Electric fans are controlled by a thermostat, so when the coolant temp gets to high, the fan turns on. It's not too uncommon for a car sitting in a parking lot to do this even after sitting for several hours (at the supermarket in the summer when it gets up to 30-35C up here, the fans on random cars will turn on and off).

Past that, yeah, it could be the relay or the thermostat could be sticky.

posted by  Martian

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