2004 Pontiac Grand Am Odd overheating

Tiny
RAAHLMAN
  • MEMBER
  • 2004 PONTIAC GRAND AM
  • 3.4L
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 150,000 MILES
It has a weird overheating problem. We have replaced the thermostat, and the water pump. When we put the coolant back we used a tool to pull the antifreeze back into the system. Until it gets to full running temperature. It will overheat slightly, when it over heats it pushes coolant out the overflow tube. Once it is at full running temp. It quits overheating, but if it is idling it has no heat. Once it is running down the road or the accelerator is pushed to bring the RMPs up it gives heat again. This all started after there was a broken wire to the started that made it seem like it need a new alternator. I don't know if this is a coincidence or not. Any ideas on what could be the problem
Do you
have the same problem?
Yes
No
Thursday, December 11th, 2014 AT 6:44 AM

8 Replies

Tiny
JOHNNYT73
  • EXPERT
Here is what you gotta do. This is a common problem when filling the cooling system on these FWD GM cars. When cool, remove the cap, make sure the coolant level is good, start the car and turn on the heat, let it run till it reaches operating temp, Raise and hold the rpm to 3500 and hold for 5 seconds then let it idle down, open the bleeder screw to see if you get solid trickle of coolant out of it, close the bleeder, raise the rpm to 3500 and hold for 5 seconds and let it idle let is idle, open bleeder to check for air, close bleeder, raise rpm to 3500 for 5 seconds.(Repeat till you get heat at idle), keep checking the coolant level between revs. Then shut off the car and let it cool down completely with the cap off. Return later to when it is cooled down and check the coolant level (fill if needed), put on the cap, and start it and let run and check for heat at idle and any overheating.
Was this
answer
helpful?
Yes
No
Thursday, December 11th, 2014 AT 8:52 AM
Tiny
RAAHLMAN
  • MEMBER
I opened the reserve cap and filled it this morning. I left the cap off then turned the heaters on high and started the car. Them level in the resevoir rose until it was going out the overflow is that normal?
Was this
answer
helpful?
Yes
No
Thursday, December 11th, 2014 AT 9:01 AM
Tiny
JOHNNYT73
  • EXPERT
That will happen. When you raise the rpm your pushing the air pockets out. Also if you let it run long enough the coolant will begin to boil from not being under pressure. If I rememeber right you may also have to shut off the car in between the rpm revs to settle it for about a minute or two while keeping an eye on the coolant level. These things can be a bear to get the air out at times.
Was this
answer
helpful?
Yes
No
Thursday, December 11th, 2014 AT 9:05 AM
Tiny
RAAHLMAN
  • MEMBER
I had not raised the RMPs it started to happen with in a minute of the car starting.
Was this
answer
helpful?
Yes
No
Thursday, December 11th, 2014 AT 9:07 AM
Tiny
JOHNNYT73
  • EXPERT
Ok, try again but this time do the procedure I posted and it should resolve.
Was this
answer
helpful?
Yes
No
Thursday, December 11th, 2014 AT 9:23 AM
Tiny
RAAHLMAN
  • MEMBER
Ok thank you
Was this
answer
helpful?
Yes
No
Thursday, December 11th, 2014 AT 9:25 AM
Tiny
RAAHLMAN
  • MEMBER
Can it still have air in the system if we sucked the system down with a vacuum?
Was this
answer
helpful?
Yes
No
Thursday, December 11th, 2014 AT 9:37 AM
Tiny
JOHNNYT73
  • EXPERT
Yes it can. The problem you described is exactly the issue these GM cars have with air in the system.
Was this
answer
helpful?
Yes
No
Thursday, December 11th, 2014 AT 9:41 AM

Please login or register to post a reply.

Recommended Guides