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Re: Grand Prix idle/(cooling?) problems
The second aux fan will only come on if the AC is on, or coolant temp exceeds 240 degrees. Since you replaced the IAC, but the code is still there, I would inspect the harness that plugs into it. If that looks good, then I would suspect the new IAC is bad. If I had a nickel for every time I've heard "but I replaced the ______, that can't be the problem" I'd be typing this from my own island in the Carribbean.
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Still waiting for the "good old days" I'll get to bore my future grandchildren with!
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