Hello.. I hope someone can help me out.. I've been having a hard time with my 1995 Grand Am GT 3.1L cooling system.
Here's whats happening..
The temp will rise above 230 at an idle/low rpms, and I'll get no heat from the car. But, as soon as I accelerate to above 2500rpms, the temp drops down to normal and I get excellent heat.
Here's what I've already done..
I've replaced the intake gaskets, new radiator, both temp sensors (pcm and gauge sensors), coolant flush, properly bled the cooling system. I've also put a vaccum kit on the cooling system and backfed the coolant to refill. The system holds perfect pressure with my stant pressure tester, and also holds perfect vaccum at 15lbs. I've also check the engine several different ways for a possible head gasket leak.. all turn out negitive.. what the heck am I overlooking?
Any help or suggestions would be greatly appriciated!!
--John