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Smoothfrc, You are right. I started the engine this morning with the a/c off and it did not do it. It's interesting that the GMC dealer was not aware of this. Thanks

2007 Yukon- When I start the engine in the morning, the cooling fans run at full speed. If I stop the engine, and restart it, they run at a slower speed. Has anyone encountered this problem? The GMC dealer told me he has not had this problem come up, and offered no solution.