Ive got a 1995 Pontiac Trans-am LT-1 car that was perfectly fine yesterday then when we started it up this morning in the driveway it skyrocketed in temp and overheated even though it was 45 degrees?
pulled the thermostat out nothing changes, secondary fan is running, still climbs and
overheats, added coolant to her and it seems to be going somewhere but no water in
the oil at all and the coolant resivior is holding fine but the radiator seems to not be and
there is no water underneath? Car doesnt miss or idle funny? Just drove it 3000 miles
last month from florida to the mountains in california and she ran fine the whole time.
Im completely at a loss....
sorry if this is "obvious" but, pressure check (or just replace for ~$5) the radiator cap.
actually, you should pressure check the whole system to see if there is a leak somewhere. i think some auto parts places have the pressure checkers you can borrow.