[QUOTE=benhogan;3020352]some things to check-

-is the coolant oily?
-is the oil cap 'milky'?
-do you see white smoke from the tailpipe?

No oil in the coolant, no coolant in the oil, neither the rad or oil cap has any kind of residue and there is no smoke at all from the tailpipe. I'm just surprised that the car could drive basically flawlessly with absolutely no signs of anything wrong. Is that possible. Shouldn't I have a loss of engine power or at least a rough running engine?

Later this afternoon, I'm going to check for bubbles in the radiator.