Gauge cluster is bad. Had the dealer check it out instead of throwing money at it. MUCH better than replacing the head gaskets or worse this weekend if it would have been something major.
Incidentally, this is one of the honest GM dealers. I dropped the truck off this morning, they diagnosed it for me and didn't charge me a penny for it. My hat is off to them.
Thanks to those offering suggestions, Snowman
I said that anti-freeze bubbled out the radiator cap when it was cold, but I may have had a leaky cap. I replaced it and it's dry as a bone. Seems funny that several things went at once, but that is how it goes sometimes. Heck, the same day I burped the system, I found a pin hole rubbed in the A/C line coming off the pump - heard it hissing. Sometimes when it rains, it pours. However, for a 10 year old truck, I sure won't complain.
Snowman
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