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1998 Pontiac Grand Prix Engine heating up, then cooling bac

Tiny
LILMONEY865
  • MEMBER
  • 1998 PONTIAC GRAND PRIX
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 90,000 MILES
My GTP has had some cooling problems for about 2 months now. It would get hot, then cool down rapidly. We've replaced the thermostat and it still seems to do the same thing. What now could be the issue?
Sunday, April 5th, 2009 AT 1:22 PM

3 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Make sure it is actually heating up, I use an infrared gauge and take readings, it could be the sender, is the cooling fan working? If it is actually running hot and cooling, the you may have air in the cooling system.
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Sunday, April 5th, 2009 AT 3:45 PM
Tiny
LILMONEY865
  • MEMBER
  • 2 POSTS
I believe it is because after it gets near the redline it'll still stay pretty high, then cool down close to where its supposed to be.
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Monday, April 6th, 2009 AT 3:58 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
You might want to remove the thermostat and drill a small 1/4 inch hole in the flat steel part, this will allow air to pass thru and then you can remove the radiator cap to remove the air, or have the system drained and refilled with the special units avalable to fill tough airbound systems.
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Wednesday, April 8th, 2009 AT 6:10 AM

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