Mark, thanks. I know no one thing is giong to solve the heat issue.
I have several friends that have F150's that are supercharged and they're not having any trouble in our summer heat so evidently Ford has figured out the magic combination.
Cerritos Hummer's service department did call today to say that a brass valve guide got sucked into the head and that the head would need to be replaced. We're still waiting to find out who's going to pay for it, me or the warranty company. While this address the check engine light that came on on my recent trip to Ca it doesn't address the running hot or above normal.
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