Go Back   Tech Support Forum > Automotive Center > Automotive Support

1999 Jeep Grand Cherokee Radiator Fan

This is a discussion on 1999 Jeep Grand Cherokee Radiator Fan within the Automotive Support forums, part of the Tech Support Forum category. Hi, Recently my 1999 Grand Jeep Cherokee Laredo 4WD overheated and the radiator broke. After changing the radiator we found

Closed Thread
Thread Tools Search this Thread
Old 06-07-2007, 09:02 PM   #1
Registered Member
Join Date: Jun 2007
Posts: 2
OS: win xp


Recently my 1999 Grand Jeep Cherokee Laredo 4WD overheated and the radiator broke. After changing the radiator we found out that this was caused by a malfunctioning radiator fan. The mechanic stated it could be the relay so I decided to make the change. Thanks to this website I found the relay under the left front light and was able to replace this. However, the fan still did not work properly although the fan seemed to turn very slowly without cooling down the engine.

I have driven the car to work as the air flow seems to help keep the car cool. However, today the car overheated thanks to traffic and little car movement. Fortunately, the radiator did not break but the upper hose did. I do not know what the problem could be ? What moves the fan? Is it a belt or an electric motor? If it is the motor, how can I check if this works? Could it be the fan itself?

Need Help?!
rocke70 is offline  
Sponsored Links
Old 06-08-2007, 01:55 AM   #2
TSF Gearhead
Join Date: Mar 2007
Location: Brisbane Australia.
Posts: 601
OS: All Systems, mainly Linux

Good Evening rocke70, I am not familiar with that particular vehicle, but generally the system works like this....
There is generally a thermal sensor switch located on the radiator, most often near the bottom, (but it may be in one of the water galleries on your machine) this usually operates in the region of 85 degs C, this then normally would operate the fan relay which in turn operates the electric fan.

The electric fan should really run with pretty decent guts and will be hard on fingers if you are in the way, it usually only needs short runs to drop the temperature.

There is generally a second electric fan associated with the airconditioning system, don't confuse which fan is which, the A/C fan should run most times when the A/C is functioning and is not as powerful as the engine cooling fan.

Most often the thermal switch is the problem when vehicles overheat, (provided that the system and thermostat is otherwise operating properly) I would suggest examining the thermal switch system urgently, it is also possible your fan may have a problem in it's motor and is not operating properly .

I can't explain why you are seeing a mediocre operation with it.

I generally identify which switch / sensor is involved and remove and place it in a saucepan of hot water with a meter lead attached and carefully ensure it is operating before the water boils.
Generally the fan switch / sensor only grounds a current path to operate the fan relay.

I hate seeing aluminium clinder-headed vehicles overheat, generally it starts a chain of nasty events.

Cheers, qldit.
qldit is offline  
Old 06-08-2007, 06:15 PM   #3
Registered Member
Join Date: Jun 2007
Posts: 2
OS: win xp

Good Evening Qldit!

Greatly appreciate your recomendation. I will try to check this and get back to your tomorrow with the results! Thank you!

Cheers Mate!
rocke70 is offline  
Old 06-09-2007, 12:07 AM   #4
Registered Member
Blaine B.'s Avatar
Join Date: Nov 2005
Location: Indiana
Posts: 202
OS: XP & Vista


Jeep dedicated forums. Maybe you'll find help there. I own a Cherokee......good luck!
Blaine B. is offline  
Closed Thread

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Four Door Jeep Wrangler
I bought my first Jeep Wrangler in the fall of 1994. I have never had any desire to replace it, it is still my primary vehicle. Also the fact that I now have two kids made it very unlikely that I'd buy another Jeep Wrangler for it least 20 years. That has all changed with the new four door...
superflysmith Talk Car 3 10-18-2006 05:54 AM
Jeep Cherokee Charging Problems - HELP!!!!
First off, I am not new to auto repair. I rebuild vw beetles in my spair time and have been repairing cars and trucks most of my life. That gbeing said, I have a problem with a jeep that has me dumbfounded. I have a '93 Jeep Cherokee Sport, 2wd, at, etc... About 2 months ago, when ever I...
seiji Automotive Support 8 03-26-2006 01:44 AM
1987 Jeep Cherokee/ I need help
I have a link in my jeep. Everytime I drive my Jeep I have to put water or coolant in the reserve area for the radiator. I can only drive a short distance then the jeep will turn off . I am not sure if it is over heating! It is not linking from the radiator. Can someone help me to let me know if I...
kajuan Automotive Support 1 09-18-2005 06:21 PM
Jeep Cherokee Cooling Fan Doesn't Run (SPLIT)
this post refers to a previous post, but was split apart. the original thread being referred to is here I have a 96 jeep and it overheats. I have read all the post on overheating on here so I joined the group to talk about my problem. I basically have the same problem with one difference. ...
SheliaL Automotive Support 8 08-26-2005 03:43 PM
O1 - Hosts will not go away!
I am working on my relative's computer and they have O1 - Hosts: auto.search.msn.com, O1 - Hosts: search.netscape.com, and O1 - Hosts: ieautosearch that I can not get to go away. I've deleted them from HJT as well as going through SafeMode and they still come...
Domer06ND Resolved HJT Threads 22 05-02-2005 07:52 PM

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is on
Smilies are on
[IMG] code is on
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Post a Question

» Site Navigation
 > FAQ

All times are GMT -7. The time now is 11:44 PM.

vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 2001 - 2015, Tech Support Forum

Windows 7 - Windows XP - Windows Vista - Trojan Removal - Spyware Removal - Virus Removal - Networking - Security - Top Web Hosts


Partially Powered By Products Found At Lampwrights.com