Question about 2004 Jeep Grand Cherokee

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Needle shows overheating when idling. Fan is turning

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  • yadayada
    yadayada May 11, 2010

    trust the gauge always


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  • 39 Answers

1. you thermostat is locked-up.
2. the radiator may be stuffed.

Posted on Apr 28, 2010

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1 Answer

Overheating when I sit idle.

Over heating the engine is a serious concern. With the hood raised you should hear the motorized fan turn on just behind the radiator as the engine requires additional cooling.. If you look in from the rear of the radiator you should see the fan blades.

This electric powered motor operates on a thermostat and when the engine temperature rises this fan should come on. I'm assuming from your description that when driving and air is flowing through the radiator as the car travels the engine is nor overheating.

Check fan motor thermostat, check fan motor and check wiring.

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Motor engine cooling fan only runs as engine temperature requires additional cooling.

Jan 05, 2016 | 2001 Honda Civic

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Car overheats when using ac.

You can try several things. The radiator fan is controlled by a thermal switch and in some cases the A/C maximum air setting. Do you know if the fan is turning on? Some have 2 speeds. The thermostat is a low cost guess.

The engine idle can be affected by overheating. Also turn off the A/C and see if that makes a difference in idle or overheating.

Jun 11, 2015 | Ford Cars & Trucks

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Why is car heating up en it has water and a new thermostat??

check to make sure the cooling fan is working if not this is your problem if its working then have a head gasket test done as this too can cause an overheat problem. also have you bleed all the air out of the system.

Oct 11, 2014 | 2002 Mitsubishi Montero Sport

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Hi my 2000 Honda odyssey temperature gauge rises to red but shows no signs of the car overheating but while driving everything is normal but this only happens while in idle any suggestions? Need help asap

Make sure your cooling fans come on. If overheating at idle it is likely for the fans to have failed. While driving the air rushing through the grill cools the coolant in the radiator which is probably why it's fine while driving. You shouldn't drive the car if overheating as this will cause damage to the engine. Check fan relays, fuses and fans. If you turn the A/C on the fans should come on.

Apr 20, 2014 | Cars & Trucks

1 Answer

01 malibu overheating

hi I have overheated coolant needle wasup tp hot ans light comes on and I took out thermosast out and run idle its okay but driving the temp is rising and the heater have no heat but fan works I have 2009 mabilu

Jan 23, 2013 | 2001 Chevrolet Malibu

2 Answers

2005 focus overheating at speeds greater than 45 mph. Does not overheat at idle. Gauge goes back to normal immediately when speed is reduced. Radiator, thermostat, coolant reservoir and sensor have...


It sounds like there is air in the system, also worth noteing that thermostas can be faulty at any time even when new so might be worth rechecking that, I remoe it and then place the thermostat in a pan of boiling water if you see it open easily then at least you can rule this out. also is the water temp sensor clean, or the part where it sits into the engine is that clean?

Finally the only other thing is air in the system, did you have the system bled through after the new parts where fitted? and the only other thing I can think of is the fan is starting to fail, they can overcharge at higher revs or at higher speeds so then the fan cuts out or slows down thus not creating the correct amount of cool air. you can test this with a amp meter, worth checking all connections also from and to the battery and the fan itself. It is quite common on fords this fan issue.

ohh there is one more thing, there is a heater control module that sits dierctly behind the dash board in the centre, you can see this from the engine bay again in the centre has 2 pipes one in and one out, this is for the cabin heating that feeds to the heater matrix, these alwyas fail and can cause the heated water to stop at the cabin end and return to the engine thus cauing overheating, this is rare that it would do this but it is just another possibility for you.

Hope this helps.

Dan. p.s I would check the fan first!!!

Dec 27, 2010 | Ford Focus Cars & Trucks

1 Answer

2003 trailblazer overheating while @ idle

Check the wiring and connections on the coolant temperature sensor that I believe is on the thermostat housing. If they look good, replace the sensor. It is pretty rare to have an electric cooling fan motor fail but not impossible. They are usually very expensive. Expensive enough that you will want to make sure that is the problem before you replace it. Usually the sensor will fail. **Please rate me on this answer.**

Jun 24, 2010 | 2003 Chevrolet TrailBlazer

1 Answer

Overheating at idle

sounds like a partially plugged radiator. Colder temps will be OK but when weather warms up the problem shows up too...check for leaves etc between the radiator and ac condenser before doing anything else. Stuff on the outside will act the same way as an internal obstruction.

May 06, 2009 | 1995 BMW 5 Series

1 Answer

Thermostate ranges from overheating to just fine while driving.

is the fan working? if the fan isnt working it will overheat when idling, as it wont be sucking cold air through the radiator. a quick way to diagnose that your cooling system is fine is when stuck in traffic, turn your heaters onto hot, if the engine temp gauge shows that the engine is cooling down, the cooling system will be fine 9/10 times.

hope this helps.

Mar 18, 2009 | 1996 Buick Regal Olympic Gold

1 Answer

Overheating engine: termo guage at the middle during idle

The Temp gauge should read in the middle of the gauge at operating temperature. This is normal. The radiator fan should come on after idling (not driving) for 20 minutes. The fan should also come on when you turn on the AC. Are you experiencing overheat problems?
Please reply if you have overheating issues.

Oct 16, 2008 | 1994 Toyota Corolla

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