Been having to top off the coolant overflow tank quite a bit lately on the 2001 3.1. Not obvious where it is going though. No sign of it in the oil or the exhaust, engine running great, no CEL codes, no signs of leakage under the engine after parking it hot. Can't see any coolant collecting anywhere in the engine bay either. I do smell a faint whiff of hot coolant when I pop the hood so I think it must be slowly pissing out somewhere and immediately evaporating.
Any ideas on where these engines/coolant systems start leaking? It seems like the system is cooling system is building up pressure OK, radiator hoses are not rock hard, but with the engine coolant temp gauge stable at around 185 F,I would not expect them to be.