I have recently bought a 2005 Grand Prix V6 non supercharged.

It overheats at idle and in park. I have had my head gasket and head resurfaced at Pepboys and replaced my radiator with a larger 1 inch thick radiator. The thermostat was also with a new OEM one. Bled and burped my cooling system. No leaks anywhere. Bypassed the heater and capped the hosses. The car still wants to climb to the red. It has Dextron 50/50 and has been flushed. Both fans kick on with a good amount of breeze.

How can I troubleshoot my cooling system to discover what the issue might be with the continued overheating?

  • Does the car exhibit any other symptoms of overheating, such as steaming or bubbles into the overflow? Also, if it shows as overheating and you move the vehicle (take it out for a drive) the temp goes down? Commented Apr 16, 2016 at 21:39
  • If i take it for a drive the temp risses considerbally faster it doesn't seem to be bubbling in resivor i can tell its cycling from when i burped it i could see the difference in temp of the fluid Commented Apr 16, 2016 at 21:45
  • Are you sure the thermostat went back in correctly? If it's upside down it can cause problems. Commented Apr 16, 2016 at 21:49
  • I did it about a hour ago with the half with the spring into the engine and other half towards hose Commented Apr 16, 2016 at 21:52
  • How did you go about burping the engine? Commented Apr 16, 2016 at 21:53


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