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Jeep Grand Cherokee A/C Heating Ventilation

lgmigoyalgmigoya Posts: 3
My 2002 JGC started having temperature control problems, cold on driver /hot on passanger , gotit fix at the dealer US$300 , six months later it will cool but will not heat either sides, went to the dealer, their estimate is now us $1,100, they claim they have to replace booth temperature selectors and some valve or damper on the back. Does any budy have a cheaper solution???
All started to happen just after warranties had expired


  • I have a 03 GJC and have checked the relay for the cooling fan and have also unplugged the connection to the fan. The fan continues to run at a high speed when reconnected. What is the cause of this and how do I fix it? The fan has drained the battery dry.
  • tidestertidester Posts: 10,059
    You should check out the Jeep Grand Cherokee: Problems & Solutions discussion.

    tidester, host
  • Cooling fan relay stuck in closed position. Replace relay or 1st tap on relay to see if it opens so fan stops.
  • lynndeelynndee Posts: 1
    im having the same problem with my 99 jeep grand cheroke. the fan continued to run when the engine had been off for a long time. the fan actually ran all night and drained the battery. is this somehting i can fix? :cry:
  • This is something you can fix! First you would want to check the coolant temperature gauge, probably on the front of your engine block, connected with a sensor. Look on to see what that looks like. Easy fix if that is it. About $40. If that doesn't work the infamous relay placed on my 03 behind the front passenger headlamp on the wheel well. Possible to fix if you have a couple of hours and the willingness to pull the headlamp and bumper 60% off. That peice is $70 but defintely beats paying the mechanic if you are mechanically inclined.
  • Replace the radiator fan is under the passenger side headlamp. They call it a 'relay' but it is actually an electronic solid-state device...looks like an old-style ignition module. Remove the pass side headlamp and cut a hole in the black plastic "reinforcement panel" under the headlamp and you will see the relay. I know it sounds unprofessional to cut a hole, but it does not hurt anything, and it is SO MUCH EASIER than removing the bumper!!! The relay is held down with 2 small not lose them!!! The relay needs to be tight to the body so it does not overheat and fail prematurely.
  • Good luck, friend. You have to pull the dash and then pull the whole a/c-heater case, then open up the case to replace the evaporator. This is an easy but time-consuming job for an experienced Jeep dealer technician. You better be good to try this at home.
  • Quadring,

    I only have one word for your "shade-tree" unprofessional idea of cutting a hole in the plastic headlamp housing....


    Saved me a full day of labor, I am sure. I used a Dremel with the funky drill bit used to cut circles in dryway.
    Turned an "all dayer" into a 15 minute job.

    And to the engineer that thought it was a good idea to mount the relay there in the first place.... Get back to Springfield, they miss you at the nuclear power plant. D'oh!
  • Is the relay be in the same spot for a 99 cherokee sport? I don't have an owner's manual
  • I've seen similar posts about something like this before, but is there a way to tell if it is in fact the radiator relay that's faulty? would anyone have the part number for the fan relay?
  • I am on my second Cherokee and have 112000 miles on it. In general, I am happy with it, except for one thing. For about the last year, if it's hot and I put on the AC, some vents blow AC, some blow heat, and if it's cold - same thing. I went to my dealer and they can't "recreate the problem". I can't believe that, especially after I heard from a used car dealer (who has no ax to grind) that this is a "known" problem with the Grand Cherokee limited. Any suggestions?


  • tst58tst58 Posts: 5
    I just had the condensor, heater core, and evaporator replaced in my 2002 Grand cherokee. There is are hissing sound coming from under the passenger side of the dash. It occurs even when the air conditioner is not running. My mechanic said that a new type of equalization valve was part of the new install. Why is the 5 second hiss every 30 seconds repeatedly occuring? Has anyone else had this problem and I am looking for a solution.
  • jcharjchar Posts: 2
    I am trying to troubleshoot a radiator fan problem:

    1. Jeep overheating because radiator cooling fan will not come on. Disconnected the fan plug and jumped two wires directly to the battery but fan still won't turn? Wires are black and blue solid. Blue should be positive? Black negative? Shouldn't fan run when directly jumped to batter? Please help!

  • Even if you hooked it up backwards the fan would run backwards. So, yes, the fan should run when connected directly to the battery.

    Does it overheat when driving at highway speeds? If not, then it probably is the fan. If it does, then you may have other problems.
  • jcharjchar Posts: 2
    Only overheats when stopped. Normal temp when moving w/airflow. Thanks! Will visit local salvage yard in hopes of finding a used one..thanks!

  • 1999 jeep grand cherokee ac,power window and compass/temperature display all suddenly stop working. is there a fuse or relay that controls all of these? where can I locate it or them. i searched everywhere without success. can i reset the computer by disconnecting the battery if that's the solution? i had the battery replaced by sam's club on sunday. could that be the problem?
  • Please tell me how to get the fan to stop running after car is off. Is this a simple problem? :confuse:
  • steverstever Posts: 52,683
    How long is it running? Radiator fans these days switch on when the temp is high enough, so they may keep running after you shut the car off.

    If the fan keeps running and running (does it run your battery down?), then you have probably have a switch or relay problem.
  • thanks for responding...and yes the fan ran all night last night... and the battery is dead this morning. I don't have the car manual...where is this switch and what is the best way to repair it.

    Steve :cry:
  • Bad relay swithh or fuse that is located in the fuse box under the hood....cost to replace was about $8.50 and took all of 3 mins. :)
  • I had the same problem occur last week. Nothing has changed on the vehical recently. Have you had any luck figuring out what it is?
  • I have a 99 Cherokee and have had to replace two of the power window controllers. Four of my relatives own Cherokees and Grand Cherokees and all of them have experienced power window failures. Why doesn't Chrysler fix this? Also the factory fog lights failed and the dealer wanted $200 dollars to fix them. I found replacement switches on Ebay and bought two of them. Fixed it myself for less than thirty dollars. Why does Chrysler have such cheap parts? I have never had a factory fog light switch fail even in my Ford Escort ZX. Chrysler needs to update their electrical parts. Also, I had a short that kept the dome lights on constantly even when the Jeep was turned off and the key removed. There is no fuse for just the interior lights! The only way to turn them off was to pull the fuse that also controlled the speedometer and guages. I spent $300 dollars for the dealer to determine it was a wire running between the headliner and roof of the vehicle. Why would a wire that is protected fail unless they are also using cheap wire? I asked the dealer about all these issues and the response was these things happen. Not with most vehicles. Chryslers purchase of Jeep may be ruining the vehicle.
  • 2 days ago, while at work, my battery had run down. I couldn't understand why because I had purchased a new battery about 3 years ago. The same heavy duty battery that Law enforcement uses for all of their electronics. Anyway, I jumped stated the vehicle and when connecting the cables to the other vehicle, right away the fan turned on, while the car was off. The next day my jeep turned on, but the radiator fan does not turn on. It is overheating my vehicle if I have the A/C or Heater on while driving. Please help. :cry:
  • Everytime that I turn on the heater I get a bad smell like old wet shoes. what could be the problem.
  • lgrifflgriff Posts: 1
    I went to get in my car and when i turned the car on and my heater came on and then went off and i can not get it to come back on "Help" SOON !!!!
  • tuggajbtuggajb Posts: 646
    body control module ???
  • My 1988 Cherokee heater when warmed up only blows out warm air, not hot. The thermostat has been change, but this has not changed the problem. The blower works fine. The problem is no hot air.
  • I have a 2001 Jeep Cherokee (100,000 miles) with an a/c compressor clutch that continually engages & disengages. I've spent hundreds of $$$ having the system flushed, recharged, checked for leaks, belts, wiring, etc. Engages/disengages in both the heater and a/c modes. 10 seconds off, 5 seconds on...repeatidly, non stop. Repair man says "live with it". This can't be normal.
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