I have a 2003 Grand AM. I changed the thremostat and it still overheats. It only overheats when the car is cold. i turn it off and wait a coulpe of minutes and it cools down and then no problems. Any ideas?

Did it start overheating after you changed the thermostat, or was it overheating prior to changing the thermostat?

It was overheating prior. It showed all the symptoms of a bad thermastat.

did you blead the air out of it whenyou changed the thermostat, on the 3400 i think there are a couple screws

There are only 4 things that can cause an overheating issue.
1. Sticking or upside down thermostat.
2. Lack of coolant.
3. Faulty water pump(vanes rotted away-but unlikely due to age of car)
4. Or gummed up cooling system.

What engine do you have??

When was the last time the cooling system was flushed?

Please take a minute to put your Year/Make/Model/engine size in your signature please. This can be done by clicking on "User CP" button at the top left of the forum.

I have a 3.4L 207CI V6. It had a all new cooling put in about 75,000 miles ago. I filled the coolant after i changed the thermastat. I believe I bleeded all the air out of the system.

I'll add a few more:

1. Blown head gasket. The oil may or may not be milky. Check it.
2. Fans not coming on. Could be a bad ECT sensor, low speed relay, high speed relay, fan motor, etc.
3. Rad cap not sealing to rad filler neck. You have a sealed and pressurized coolant system. If open to atmosphere the coolant will boil at a lower temperature.
4. Overflow reservoir cap not sealing. Same comments on sealed system.

Some Grand Am owners have corrected this with installing a new overflow and reservoir ($30???). Blown head gaskets are a common issue with your engine. If your local Autozone has a coolant pressure tester, pump it up to the recommended pressure to see if it holds or bleeds down.

Try bleeding the coolant system while parked on an up-hill slope.