Overheating issues

Asked by May 18, 2017 at 06:02 PM about the 1999 Jeep Grand Cherokee Laredo 4WD

Question type: Maintenance & Repair

I have a 99 grand Cherokee Laredo and I'm
at my wits end with overheating issues
jeep runs great on the highway but as soon
as I hit traffic it starts to over heat as soon
as traffic lets up and I start moving again
temp goes back down I have already
replaced the thermostat and water pump
flushed radiator it's self and threw engine
block and still the same problems I pulled
the thermostat out and ran it it's fine until I
hit traffic and temp starts to rise again I'm
at my wits end with this issue help please I
read the overheating issues posted by
others and I have done most of what they
said already

8 Answers


Flushing a radiator may not always clear the passages. Radiators are known to burn engines and transmissions, so if it's suspect, update it. It sounds like a small head gasket leak could do it also. Buy a kit from any parts store that sits on top of the coolant reservoir and had a liquid that changes colors if combustion gasses are present in the cooling system.

I have already changed the fan last year cause it burnt out and replaced the radiator 2 years ago what is the name of the kit you are talking about


Head gasket test kit


Block tester kit


Brian is correct. But also note: the forward movement of the vehicle is cooling the engine/radiator because the fan isn't. That means the fan is not running for whatever reason. That could be a bad fan or a bad fan control switch. Open the hood with motor running. When the temperature guage says 210 degrees F, the fan should be running. Listen and look with a flashlight. Don't touch blades.

1 of 1 people found this helpful.

my 99 is doing the same thing. and i have replaced the fan,radiator, water pump, temp sensor and thermostat, coolant ,hoses ,head gasket and other things. plus, when mine over heats,the ac stops blowing cold. i just now posted a question looking for help. good luck dude!

1 of 1 people found this helpful.

this is my question https://www.cargurus.com/Cars/Discussion-t15886_ds805557

Ok gear heads found out that my fan was running in the wrong direction didn't do the block test cause there wasn't a need for it the easy way to test if the fan is running in the right direction is while car is at temp at 210 take a paper towel and put it right in front of the grill where the radiator is if the paper towel gets sucked in fan is running correctly if it's gets blown away fans running in wrong direction easy fix is switch the to wires around and that fixed my issue a week later I blew the lower hose from water pump to radiator that was a fun fix lol now I'm having a check engine light issue check engine light comes on flashes and goes off and it does it basically when it wants to but this time it stayed on and got multiple misfire codes so I changed coilpack plugs all to mopar specs and reset codes ran for 50miles and still getting the same thing but this time misfire and say I have a bad camshaft sensor so changed plugs and sensor and I'm still getting these codes could I be having a electric shirt some where

Your Answer

Grand Cherokee

Looking for a Used Grand Cherokee in your area?

CarGurus has 72,235 nationwide Grand Cherokee listings starting at $900.


Jeep Grand Cherokee Experts

  • #1
  • #2
    Tom Demyan
  • #3
View All

Related Models For Sale

Used Jeep Cherokee
336 Great Deals out of 55,115 listings starting at $8,495
Used Dodge Durango
262 Great Deals out of 24,898 listings starting at $1,500
Used Ford Explorer
1,072 Great Deals out of 67,954 listings starting at $1,200
Used Toyota 4Runner
352 Great Deals out of 29,570 listings starting at $1,500
Used Jeep Wrangler
389 Great Deals out of 20,649 listings starting at $2,500
Used Chevrolet Tahoe
801 Great Deals out of 40,245 listings starting at $1,799
Used Ford F-150
2,998 Great Deals out of 231,244 listings starting at $1,300
Used Chevrolet Silverado 1500
2,664 Great Deals out of 158,108 listings starting at $1,850
Used BMW X5
396 Great Deals out of 16,752 listings starting at $2,800
Used Honda Accord
790 Great Deals out of 89,574 listings starting at $1,444
Used Ford Mustang
342 Great Deals out of 41,799 listings starting at $1,488

Used Cars For Sale

2018 Jeep Grand Cherokee Laredo 4WD For Sale
4,233 listings starting at $24,690
2017 Jeep Grand Cherokee Laredo 4WD For Sale
25 Great Deals out of 613 listings starting at $21,978
2016 Jeep Grand Cherokee Laredo 4WD For Sale
9 Great Deals out of 477 listings starting at $19,700
2015 Jeep Grand Cherokee Laredo 4WD For Sale
40 Great Deals out of 1,387 listings starting at $15,403
2014 Jeep Grand Cherokee Laredo 4WD For Sale
12 Great Deals out of 599 listings starting at $12,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.