Pontiac Problems? Ask a Mechanic for Answers ASAP
It sounds like an air pocket in the block. Have you tried letting the engine run with the radiator cap off until the gauge shows normal? During this process it will puke out coolant because air is being pushed out and a lot of people think the coolant is full but its not. Any questions let me know.
Thats ok, remove that cap and let the engine idle for a long time,,,enough so that the temp gauge comes up to normal when the engine is fully warmed up then see if the level has dropped in the reservoir.
There is another way but it involves removing the t-stat and filling the block with as much coolant as you can,reconnect it, and then take the upper radiator hose off and fill it with coolant. These have always been a real pain to get all the air out of.
Did you still have questions? We can talk on the phone if you like. I will send you the offer.
You have to accept the phone call offer before i can see your number. I will submit it again.