Okay, now I feel really stupid! I checked the radiator (should have been my first act) and I have no coolant in either the radiator or the reservoir. Don't really use the truck that often, mainly for driving back and forth to hunting camp. Admittedly, I last checked the coolant a few weeks ago.
I obviously have a coolant leak somewhere. I will fill with coolant and check for leaks.
I'm counting myself lucky it didn't overheat last night! No water in the oil so appears not to be any major damage.
Thanks for the help and quick response!
P.S. I will still change the thermostat - too easy to change and too cheap to ignore.
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Wednesday, January 2nd, 2008 AT 5:48 PM