Question about 1999 Jeep Grand Cherokee

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99 cherokee laredo over heating

Checked the fan switch i think its the fan motor beacuse when i drive it cools down but if i idle it over heats any ideas?

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You can test the system by disconnecting the engine temp sensor that turns on the fan, the engine computer will go into failure mode and turn on the cooling fan, if the fan does not run check for voltage at the fan with a 12 volt test lite..

Posted on Sep 08, 2008

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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.

Wiring Diagrams related to the Honda Civic
http://www.wiringdiagrams21.com/category/automotive/honda-automotive/civic

Motor engine cooling fan only runs as engine temperature requires additional cooling.
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Jan 05, 2016 | 2001 Honda Civic

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I have a 2001 Jeep Grand Cheokee and it is overheating when I idol and when I idol the heater is not blowing cold air. It will blow warm air while I am driving down the road. What do you think could be...


Check the cooling fan motor and of course the fluid level. If the temp is changing thru the heater it could just be low on coolant , leaking from ? Two wheel drive have an elecrtic cooling fan only, make sure its spinning up when temp is 3/4. If not its probably the fan motor. Can be checked with a test light .

Feb 11, 2011 | 2001 Jeep Grand Cherokee

1 Answer

Coolant sensor keeps saying bad would that cause it to over heat jeep laredo 97 grand cherokee


Yes, cause that sensor operates the electric cooling fans by the radiator, if those fans or fan don't come on, the radiator can't cool down as quick and causes the engine to run hotter.

Aug 11, 2010 | 1997 Jeep Grand Cherokee

1 Answer

2004 Mitsubishi Outlander AWD, over heats when idle/stopped, cools down when driving. Added antifreeze 2 weeks ago, problem fixed until yesterday when started heating up again during idle, antifreeze...


Sounds like the electric fan is not coming on. Could be the switch screwed into the radiator, a malfunctioning fan relay, a blown fan fuse or the fan motor has gone bad.

Jun 23, 2010 | 2004 Mitsubishi Outlander

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I have 2003 grand cherokee with 140000 miles that overheats at idle. as soon as i start moving again, the temp goes back to normal.


You have two fan's on your truck, 1 is a fan clutch runs with the drive belt, 2 elec fan motor, with test light and engine running at normal temp, just a little bit above 1/2 way on your temp gauge check voltage at elec. cooling fan harness if you have voltage at one of the two wire's and fan don't turn on, bad cooling fan motor, on the fan clutch after you check voltage at elec. fan motor turn engine off, with your hand spin drive belt fan if it spin's freely bad fan clutch, replace it.Also check cooling level.Hope this was very helpful

Jan 21, 2010 | 2006 Jeep Commander

2 Answers

2003 Grand Cherokee Overheating


This might help you as it looks as though you have an electric fan to cool , there should be a sensor on your radiator hoses upper and lower.they are actually switches triggered by the coolant temperature in side the hose. While your Jeep is sitting idle, shut off the AC as it adds to the heat off the engine not to merntion useing more gas. you should make sure both high and low speeds on the coolant fan work. good luck if this does'nt help check out the post, with more, on the 1995 Jeep heating up..

Jun 30, 2009 | 2001 Jeep Grand Cherokee

1 Answer

Over heating when sitting at idle for a short while


It sounds like it may be your electric cooling fan. When the car is sitting idling does the fan behind the radiator ever come on? If not then this is your problem. Your car doesn't overheat when it moving because you're passing air through the radiator with the movement of the car. The problem could be the fan itself, the fan relay, or a temperature sensor.

May 30, 2009 | 1999 Jeep Grand Cherokee

2 Answers

Having problems with fuel delivery seems to stall out at idle after it has been running awhile, i have changed fuel filter and spark plugs. 1994 jeep grand cherokee laredo with 318 v8 engine.


go to an electronics shop supplier and get a can of freeze spray.
it cools to -60f. let the jeep run until it misbehaves ,then cool down the ignition module.if it runs,you know it is bad. you could have either a heat related electronic issue,or something like a frozen egr valve ,or iac motor that keeps leaning and leaning out the mixture.
the catalytic converter could be plugged...usually a sulfur smell is with that and setoff the check engine light.
,the computer controls the idle and the fuel injection.
you may have an issue in the ecm itself. cooling down the ecm will let you know if there is an issue.
even a distributor cap that is cracked can heat up and fail
and the lead wires themselves.

May 07, 2009 | 1994 Jeep Grand Cherokee

2 Answers

2001 jeep grand cherokee laredo overheats when vehicle sits idling. Cools down when i take off and drive down the road...??? Please help. thanks


Many cars have a thermoswitch threaded into the radiator that activates the fans when engine exceedes normal optimum opperating temp. This sensor may have failed , or one of the 2 wires that go to it may have come unpluged or broken

May 07, 2009 | 2001 Jeep Grand Cherokee

6 Answers

2002 jeep cherokee laredo


the only problem that vehicle has is with cooling fans is relay/module or electrical harness to module that burns up located behind and under right front headlamp assy must remove headlamp to access relay/module that is what powers up fan motor module assy.

Jul 24, 2008 | 2002 Jeep Grand Cherokee

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