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1998 Grand Am Overheating

Tiny
CARFREAK8184
  • MEMBER
  • 1998 PONTIAC GRAND AM
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 123,000 MILES
I have had my radiator replaced, about half the hoses, and the thermostat replaced. The fan works with the AC on but does not seem to when it is not on and it still tends to run hot when the AC is on. I have heard an occasional bubbling noise when the car is first started but I have not been able to pinpoint the location. It overheats when at idle and usually takes a lot of stop and go trips in a short period to overheat. Any suggestions?
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Sunday, May 22nd, 2011 AT 7:11 PM

5 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
If the fan works with the A/C on, that proves the circuit is fine and the PCM have full control. These fans are programmed to come on at very high temps anyway, most over 225 degrees. This engine is prone to intakes gasket leaks and blown head gaskets so I would start out with a good, long pressure test.
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Sunday, May 22nd, 2011 AT 8:51 PM
Tiny
FIXITMR
  • MECHANIC
  • 9,990 POSTS
Keep an eye on coolant level for any loss. Your fan sensor also may be bad.
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Sunday, May 22nd, 2011 AT 9:02 PM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
This engine doesn't have a specific fan temp sensor. The PCM controls the fan using the same coolant temp sensor that it uses to regulate fuel mixture and numerous other functions so a problem with it is unlikely.
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Sunday, May 22nd, 2011 AT 9:07 PM
Tiny
CARFREAK8184
  • MEMBER
  • 16 POSTS
The head gaskets have also recently been replaced, forgot to mention that.
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Monday, May 23rd, 2011 AT 3:21 AM
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
That doesn't mean anything
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Monday, May 23rd, 2011 AT 12:08 PM

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