all the coolent goes into over flow none in the radiator
Is the car overheating? Have you replaced the radiator cap? Make sure you don't have air trapped in the upper hose.
I agree with Norm. Check or just replace the radiator cap ti insure it is releasing at the proper pressure.
are you bleeding it with the front end up in the air and the back on the ground like gm performance says to ?
Looking for a Used Grand Prix in your area?
CarGurus has 2,860 nationwide Grand Prix listings starting at $1,995.
Search Pontiac Grand Prix Questions
Pontiac Grand Prix Experts