Question about 2000 Pontiac Grand Prix

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Engine temp heats up when at idle, returns to normal temp when at high speed. Thermostat?

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Sounds like the fan thermostat is not working. If the fan doesn't come on then it will overheat when there is no airflow. When you drive it the air flows through it just fine.

Posted on Aug 22, 2010

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Engine idles at 1000 RPMs.At 60 MPH 2000 RPM's.Is this normal?


the 4.0L engine?
is this engine cold or hot.
why is 2000 rpm wrong for 60mph., (depends on engine and axle size and what gear you were in , then)

the idle speed for hot is too high
did you scan the PCM yet?
if hot , idle is high, is the thermostat holding water temp 180f or above. ? if not that is the problem.

Aug 23, 2016 | 1996 Jeep Grand Cherokee

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High idle and no reading on temp gauge


check that there is coolant or fluid in the radiator as a coolant temp sender cannot read air as it is a vital part of the injection system for the ecu to know if the engine is cold and if sender relays no reading it is telling the ecu that it needs to ritchen the fuel mixture (possibally the reason for the fast idle) to get the engine up to normal operating temp as soon as possible.it you live in a really cold climate a thermostat that is jamed in the open position will cause it a long time to reach a warm reading. hopefully it is just the sensor wire off the coolant temp sender and by replacing it will return ever thing to normal

Mar 01, 2014 | Isuzu Pickup Cars & Trucks

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How do i flush the heater core on the 2007 ford tarus


you may have air in coolant system you should have a bleeding point somewhere and good idea to change pressure cab too.
Just becarefull engine coolant and heating system is a pressurized system that works on high temp. can cause a serious injuries!!Safety.
you need to run the car on idle with heat on at high speed and open and close the bleeding valve with proper size and long reach tool
till no air bubbles comeout make sure you run the car enough that thermostat opened and engine run on normal operation temp. for a while.good luck.

Dec 06, 2012 | Cars & Trucks

1 Answer

My 1998 Jeep Cherokee Sport 6 cyl. acts like it wants to stall. I recently had a thermostat sensor replaced and that seemed to fix the problem. However two months later, the problem has returned. A


I'm assuming you mean a coolant temp sensor. The sensor tells the computer what the coolant temp is.
Normally when a sensor fails the check engine light comes on to warn the driver. Normally but not always.
One thing that could affect both problems you describe is the idle air control valve. If the valve fails or sticks, the engine can stall or have a high idle speed. The computer controls idle speed by how much air is allowed into the throttle body.
The throttle body could also be very dirty.

Sep 16, 2012 | 1998 Jeep Cherokee

1 Answer

Speedometer and Odometer not working at times, matches with engine heat cycle


Your vehicle speed sensor is mounted in the transaxle housing which is also subject to heating and cooling. The wiring harness to and from the speed sensor is also subjected to engine heating and cooling. Anybody that knows anything about electrical circuits can tell you that an electrical circuit's worst enemy is heat. You need to diagnose the vehicle speed sensor circuits like the code is TELLING you to do.

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1 Answer

My 2000 pontiac grand prix, the Engine temp heats up when at idle, returns to normal temp when at high speed and now it is almost at the overheating level whether i'm ideling or driving, Is it the...


The initial problem points to the radiator fan(s) not running at any road speed. Check the fan(s) for noise-free turning by hand. Check fan fuse and relay (swap with similar relay). Turn on the air conditioner which should immediately turn on the fan(s). Overheating while driving could very well be the thermostat--you will need to drain the cooling system before replacing the unit. Blow out the radiator core with compressed air from the engine side to remove bugs and other debris first. Hope this helps!

Oct 02, 2010 | 2000 Pontiac Grand Prix

1 Answer

At high speed engine temperature is Ok, at low speed or idle it warms up to over half way and the coolant level warning light comes on. There is plenty of coolant, an new water pump and a new thermostat....


is cooling fan coming on?? the coolant level light pertains to a sensor that is in radiator side tank that is notorious for going bad you may have two seperate problems normal temp at high speed tells me the wind passing across radiator is keeping cool when stopped or in traffic as temp increases pcm commands fan to come on if it does,nt you will heat up

Mar 19, 2010 | 2000 Oldsmobile Silhouette

1 Answer

Thermostat problem? 99 GMC savanna cargo 2500 5.0 liter


jt\\it could be the water pump or the thermostat giving you problems

Jan 22, 2009 | 1999 GMC Suburban

1 Answer

High idle at start, using tremendous amount of fuel


How high is the idle speed? I know Tundras, especially the V8s have a high idle speed in order to heat up the engine because it runs better at a higher temp and also because the heat wont blow until the engine is warm

Jul 22, 2008 | 2004 Toyota Tundra

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