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Re: electric fans - cool down after engine off
They are not supposed to run after the engine is shut off. The factory used to do that, but not any more, at least on GM LS engines. I think they realized it wasn't really helping like Cline said. As for your second fan not coming on, check your tune to see what temps it's set to come on and go off at. I've seen a lot of people have the second fan relay just click on and off, and the think that it has to be a tune issue.
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