Question about 1999 Jeep Grand Cherokee

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Radiator fan will not come on my 1999 jeep over heats when standing still

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  • eondrus Apr 17, 2009

    I check all fuses

  • Curt Downs May 11, 2010

    6 or 8 cyl. engine?

  • Mike Butler
    Mike Butler May 11, 2010

    Have you checked all fuses & rad fan relay for power & proper operation? Possibility of temperature sensor faulty also, but confirm other things first.

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Jeeps had a problem with the fan relays and fans on those models. The relay is mounted inside the engine compartment behind the passenger headlight. Try removing the relay and jumping it out. If the fans come on when the relay is jumped, you can try replacing the relay to see if that fixes the problem. If the fans don't come on, check the wiring from the relay to the fans. You can disconnect the fan connector and jump power and ground directly to that to eliminate bad wiring. If it still doesn't turn on the fan needs to be replaced.

Posted on Apr 17, 2009

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I had to have my fan replaced as well. I had the water pump replaced as well while it was apart...it will go to if you haven't changed it, if the car is around 80 + thousand.

Posted on Apr 17, 2009

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1 Answer

99 jgc 6cyl changed all but radiator still heats in town


sounds like sludge build up in the radiator, have it flushed, however that might cause leaks that the sludge is currently plugging up, so be prepared to replace the radiator

Sep 08, 2012 | 1999 Jeep Grand Cherokee

2 Answers

Which cooling fan is the primary on a 99 jeep grand cherokee ???


The main cooling fan on this 1999 jeep cherokee, the main fan all depends.

These jeeps come with diffrent fan set ups. Here are a few, the first may be a fan driven off the motor by a fan belt and a another fan which is electric. the primary fan used for cooling is the fan that runs off the engine with a belt. the other electric fan is more the air conditioning system, this fan is used for cooling the condensor mainly. the engine driven fan is for the cooling system.


Another system fan set-up on these jeeps would be the motor driven fan by belt with another electric fan in front off it, the diffrence between the first and this one is that the first fan system is side by side and this one is set-up one in front of the other but the concept is the same, the fan driven by the engine is mainly for the cooling of the engine coolant and the electric fan is for air conditioning cooling.

In both set-ups the electric fans also help the cooling system but are mainly used for the help in cooling when the a/c is turnned on, the a/c condensor builds up heat the same as the radiator does, one fan is unable to cool both the radiator and the condensor, this is why some cars have two fans.

Good day, hope this is helpful,

Mar 18, 2012 | Cars & Trucks

1 Answer

1999 Jeep Cherokee Sport wont shift into overdrive P1491


P1491 - Radiator Fan Control Relay Circuit Open Or Shorted

When monitored: with the ignition key on, battery voltage greater than 10.0 volts and
the pcm requests the radiator fan to be turned on.
Set condition: an open or shorted circuit is detected in the radiator fan relay control
circuit.

Possible causes
radiator fan ctrl rly circuit wire harn intermittent defect
radiator fan ctrl rly circuit wire harn observable defect
radiator fan relay ground circuit open
rad fan relay control circuit open
radiator fan relay control circuit short to ground
rad fan control relay defective
pcm defective

Check ot and keep us updared.

Oct 15, 2011 | 1999 Jeep Cherokee

1 Answer

Jeep Grand Cherokee running hot. I've changed the


Check your radiator for external and internal obstructions (leaves, bugs etc on the a/c condenser or leaves between the condenser and radiator, rust or calcium deposits inside the radiator core all cause loss of heat transfer)
Also make sure that the system is full and that the electric fan and the clutch fan are operating properly. (electric fan should come on just above normal operating temp and clutch fan should not be "freewheeling" above temp either)
Note: If you need to have the radiator flushed, do it separately from the engine. especially the inline 6 and 4 engines rust up inside and if the system is flushed with the radiator connected, the debris will pack up inside it and actually can worsen the condition.

Apr 23, 2010 | 1999 Jeep Cherokee

1 Answer

Location for radiator fan control relay circuit for 1999 Grand Cherokke Laredo.


This relay is a common problem for Chrysler vehicles. Located in the passenger side bumper area (Jeeps). Test the fan first.

Hope helped (remember rated ths help) Good luck.

Nov 04, 2009 | 1999 Jeep Grand Cherokee

3 Answers

My 1999 Saturn does the exact same thing


The radiator fan is not spinning. Car overheats when idling with no air flowing through the radiator fins.

When you are driving, there is enough air flowing through the radiator fins to keep the Saturn cool.

1. Check the radiator fan (cooling fan) fuse.
2. Check the radiator fan electrical connector. It may have vibrated loose.
3. *sigh* .. replace fan motor....

If you need instructions on how to replace fan motor , please comment.
Just don't let the fan scrape against the radiator when you are removing / rfeplacing the motor.

Hope this helps ... and it's just a fuse.




Sep 15, 2009 | 1999 Saturn SL

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

1 Answer

We can not remove the radiator


You will need to Remove the Top Panels that Cover the Fan Shroud. Remove the Fan Shroud which is attached to the Radiator and then locate all of the Mounting screws for the Radiator.

Jan 22, 2009 | 1999 Jeep Cherokee

2 Answers

1999 jeep wrangler very little heat


next time you go up a hill see if the heat is still blowing

Nov 30, 2008 | 1998 Jeep Wrangler

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