99 gp gt overheats when idleing - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 12-01-2011, 06:15 AM   #1
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Default 99 gp gt overheats when idleing

ever since i bought the car ive noticed that it gets really hot while idleing, wether im sitting it at a stop sign or parked during idle. i just basically sit there and watch the temperature dlslowly rise on up. i also have been hearing about people upgrading there stock thermostat to the 180 .
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Old 12-01-2011, 07:54 AM   #2
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180 will actually make your car run poorly, if not tuned for it. if the thermo was stuck closed it would overheat rapidly, if it was stuck open it wouldnt get very hot. usually when i see your issue, as long as the fans are working, its the rad fins and or condenser fins clogged with crap. i usually take the fans out spray with simple green and back flush it with the hose a couple times.
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Old 12-01-2011, 08:04 AM   #3
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that makesu since. so i should get a full ratiator flush?
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Old 12-01-2011, 08:05 AM   #4
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if my fans didnt work i should get a check eng light shouldnt i?
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Old 12-01-2011, 08:27 AM   #5
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no, you got to look, one turns on at lower temps and the other im not real sure on the exact number but i would guess around 210-220.
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Old 12-01-2011, 08:28 AM   #6
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changing the coolant would be a good idea if it hasent been done in a while
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Old 12-01-2011, 08:41 AM   #7
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Stock fan settings are 216F low speed and 228F high speed turn on. If you aren't getting over those temps..then your fans shouldn't be on.

If you turn on the AC, your fans should come on. This is a way to test that the computer can command the fans on w/o having to bring the car up to temp.
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Old 12-14-2011, 04:19 AM   #8
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Quote:
Originally Posted by BillBoost37 View Post
Stock fan settings are 216F low speed and 228F high speed turn on. If you aren't getting over those temps..then your fans shouldn't be on.

If you turn on the AC, your fans should come on. This is a way to test that the computer can command the fans on w/o having to bring the car up to temp.
my fans are working...however i did notice some caked on coolant that leaked from my t-stat housing...checked the two bolts and they were tourqed correctly... could it be my t-stat gasket?
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Old 12-14-2011, 09:07 AM   #9
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A bad t-stat gasket can cause your car to overheat in one of two ways. It could cause sufficient coolant loss to cause a problem, and it could introduce air to the coolant system.

Check the coolant level in the recovery tank, and adjust as required.

Bleed the system using the bleeder screw on top of the t-stat housing until no more air comes out.

Fix the t-stat gasket. Its easy and inexpensive to do.

After all that, if it still overheats, let us know.
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Old 12-14-2011, 11:49 PM   #10
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Originally Posted by 2kg4u View Post
A bad t-stat gasket can cause your car to overheat in one of two ways. It could cause sufficient coolant loss to cause a problem, and it could introduce air to the coolant system.

Check the coolant level in the recovery tank, and adjust as required.

Bleed the system using the bleeder screw on top of the t-stat housing until no more air comes out.

Fix the t-stat gasket. Its easy and inexpensive to do.

After all that, if it still overheats, let us know.
so ill get another tstat and install it. after installation i should bleed the air out? how do i bleed the air out?
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