mystery coolant leak????? Pontiac Firebird 3.8
I have a 2001 Pontiac Firebird with about 108,000 miles on it. I have been loosing coolant slowly for a while now. Just pressure tested the cooling system at 15psi. and would loose about a pound of pressure every couple of min. Problem is, I cannot see any coolant leaking anywhere!!! Everything is bone dry. No coolant in oil either. Was thinnking intake manifold gasket(*). Only clue I found is taking out PCV valve, would see a little moisture mixed in with oil residue on valve. Didn't know if it was condensation or coolant mixing in. Anyone with other ideas???? Car runs like a champ. Don't think it is head gasket. Planning on replaceing Radiator, water pump, hoses and intake manifold this weekend.