Have a weird one on my 2006 GMC 1500 acreage truck. I had a small puff of steam or smoke come out from under the hood as I was slowing down on the highway. I believe it happened at the same time I turned the fan higher for the AC, but that could be coincidence. No coolant issues that I know of and no mess when I opened the hood. No overheating issues and it didn’t do it again on my drive back home.
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