Quote:
Originally Posted by tchowe
There is actually an internal GM service bulletin regarding this exact issue, and their diagnosis of the issue cause is that if there is too much tension on the headlight wire harness, then water can drip down the line into the connecter causing a short and preventing the fan to come on. Might be something you want to look further into to prevent future issues.
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Wow, that is great info. I wonder if it will be changed in the future.