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Jeep Grand Cherokee A/C Heating Ventilation

1456810

Comments

  • lovmyjeeplovmyjeep Member Posts: 3
    try fliping your hoses
  • mark243mark243 Member Posts: 5
    Tried that. Installed water pump, thermastat, flushed heater core and did a lot of praying. I now get heat once engine gets up to temp and then goes cold as I drive it. So...had carbon test done on radiator gases. It seems like there may be a slight head gasket leak. Hard to say but when I run engine with cap off radiator, there is a very small bubble every now and then. So my only guess is a small leak....no other symptoms of a head gasket leak though.
  • bsloverbslover Member Posts: 1
    if you find some thing out please let me know i have the same problem email me @wildchilddrivindirt7@yahoo.com
  • steverstever Guest Posts: 52,454
    If you "watch" this discussion, then you can set your preferences to receive an email alert whenever something new is posted. And your email address won't get harvested by the spammers.

    Sending info around by email doesn't help anyone else and defeats the purpose of having a forum, so please don't ask for "private" help via email. Thanks.
  • imykimyk Member Posts: 1
    I have no heat coming out off passenger side just cold air. Driver side is fine. Also the seat heater doesn't work on the driver side.
  • cminchcminch Member Posts: 2
    hi, it seems i need to replace the blend doors on my g cherokee, would anyone know where i can get instructions on removing the dash??
    many thanks
  • roverendroverend Member Posts: 1
    I've just had these problems myself.
    the following link is brilliant although it is designed towards their product for fixing the problems. the videos show how to remove the dash.
    http://www.heatertreater.net/Jeep%20Page.htm
    the ac and heating problems are caused by the blend doors which there are 2 on climate models.
    these problems are caused by a design fault. the spindles which the blend doors and circ doors are connected to have plastic pegs to limit their movement and because the system self calibrates in ignition cycles and learns the limits by where the motors stop.
    after a period of time the self calibration tests break the plastic peg and the stresses are transferred to the connection between the spindle and the door which eventually breaks completely.
    if it is the drivers side which has the problem this can be accessed through the glove box.
    i have managed to repair mine by drilling the spindle and inserting a 3mm metal pin and then with a small amount of epoxy on the end of the spindal reinserting it into the blend door. this will only work if most of the blend door end piece is intact.
    for the passenger side blend door and problems with the recirc door the unit has to come out.
  • se_jonse_jon Member Posts: 1
    I had this problem (actually several) myself and wanted to share what I did to fix. First I had the cold air on passenger side, eventually both driver and passenger. I bought the heatertreater kit ($120) and it went pretty easy and actually worked. The next problem I discovered was "no air flow". It was the broken recirc door. I couldn't really find any good ideas without removing the dash which is way too much for my skil level. It was apparent that the recirc door had broken and fallen over the fan blocking airflow. From the glove compartment, on the right side (opposite from where the blend door repair was), you'll see a rounding in the plastic housing. Above that is the outside air intake (mesh) into the passender compartment. Using the same roto tool that was used in the blend door repair, I removed the mesh and extended the opening downward so that I could get my hand in. Then I removed the broken door and covered the entire opening with aluminum covered tape purchased at a HVAC supply store. Airflow restored and the entire heating system works for $120! (two months now-really cold here in NJ) I need to point that I no longer have dual controls and no longer have use of the outside air recirculate function, but the heat works-relatively easy repair. I have some pictures but I cant figure out how to insert them here."> Hope this helps some cold friends out there. My regards
    <img src="
  • sp8ballsp8ball Member Posts: 3
    Update.....I bought a wiring kit sold by jeep dealers specifically to repair the wiring harness connector that plugs into the blower motor resistor. All went well for a while and within a few weeks the plastic connector was melting again. Since the fan functions at all various speeds and not just on high I'm guessing the reistor is ok but the fan itself must be drawing too much current. I decided to inspect the fan as it was suggested that leaves, etc. may have fallen in there creating extra resistance. I removed the fan and it was clean so I decided to remove it to see if I could find anything wrong with it. Seemed to check out out ok but I noticed when I spun it by hand it would only complete 2 1/2 revolutions. I also noticed a brown dirty dust or more like rust powder falling out of the motor vents. Given the number of miles and age I figured the fan motor must be wering out. Looked at a new one and when I spun the fan it would itself only complete about 3 revolutions. Wondered if it was my problem after all but decided while I had everying apart I'd go ahead and put in a new fan. After replacing the fan all seems to be good. Knock on wood, it's going on 2 weeks now and the wiring harness connector isn't getting hot.

    I also found references for my codes and was told it's more than likey that my blend doors are going to crap out soon.
  • alaskanjalaskanj Member Posts: 2
    I have no heat in my cab, I thought the heater core was plugged so I back flushed the core with the heater on, coolant and air came out the supply side. indicating it was clear. I hooked everything back up and and once again I have hot coolant going to the core and no hot coolant coming out of the return side to the engine. Can anybody help with this problem. Does anyone know if there is a valve anywhere thru the heater core system?
  • alaskanjalaskanj Member Posts: 2
    Does anyone know if the heater cores are directional? are there any valves in the system?
  • jukeboxtangojukeboxtango Member Posts: 2
    i have a grand jeep cherokee ltd 1997
    my heater has started to blow cold air only,even when i select high temperature.my coolant level is fine and the air blows throgh whatever vent i choose on the heater controls.
    my tempeature in the engine remains constant and both my radiator hoses get hot when the engine reaches temperature.
    what do you think is wrong ?
    do i need to flush the heater core ?
    will this help?
    is there a cheap fix ?
    is the thermostat ok you think ?
    please help me
    thanks in advance
  • rdebartolomeisrdebartolomeis Member Posts: 1
    cAN ANYONE TELL ME WHERE THE BLEND AND RECIRC DOORS ARE LOCATED OM A 98 LAREDO tHANKS
  • blendorblendor Member Posts: 23
    Hello Jukeboxtango:

    Before you start changing parts.

    The 97 Jeep GC Limited has the Automatic Temperature Control system.
    This system has an onboard diagnostic function for your HVAC system.

    You can check the fault codes for the HVAC system to give you a starting point for finding out where your heating troubles are.

    To read the fault codes:
    1. Turn on the ignition switch.
    2. Turn on the ATC system.
    3. Simultaneously hold down the AC and the Re-Circ buttons.
    4. Hold them in and turn the temperature control knob to the right (CW) one click.
    5. Then release the AC and Re-Circ buttons. The &#147;00&#148; will show on the display.
    6. Now press either the AC or the Recirc button and the &#147;stickman&#148; will appear, indicating the fault code mode.
    If there are any codes in memory, the fault codes from 1 to 64 will appear.
  • narya77narya77 Member Posts: 4
    Hi,

    There is no air flow in my 2002 Grand Charokee 4.7L. When I click the AC button it lights up, I do hear a noise as if something has started but there is no air flow. I don't get air flow even when I do outside air. The mechanic is asking $600 just to find the problem.
    Is it a broken recirculation door or a broken blend door or something else? Please help.
  • blendorblendor Member Posts: 23
    Hello Narya77:

    Without knowing which Jeep GC model you have, if you have the AZC Automatic Zone Control HVAC system, I would recommend that you check the AZC fault codes.

    To read the fault codes:
    1. Turn on the ignition switch.
    2. Turn on the AZC system. The temperature settings should be displayed for both sides.
    3. Simultaneously hold down the AC and the Re-Circ buttons.
    4. Then turn the driver&#146;s side temperature (Left) control knob to the right (CW) one click.
    5. Then release the AC and Re-Circ buttons.

    If there are no fault codes, the &#147;00&#148; display value will remain in the window.
    If there are any codes, each will be displayed for one second in ascending numerical sequence (note: no effort is made to display faults in the order they occurred). The left side set temperature display will be blanked and the right side set temperature display will indicate current and historical codes (8 historical max) presently active.
    Once all codes have been displayed, the system will repeat the fault code numbers. This will continue until the left side set temperature control is moved at least one detent position in either direction, by pressing both the A/C and Recirc buttons at the same time, or the ignition is turned off.

    Record all of the fault codes and post them.

    Also describe any symptoms you are having with your heating system.
    Like - Are you getting a good air flow thru your vent outlets?
    Like can you hear the blower working, but no air flow?
    Can you direct the air flow to the different outlet vents &#150; defrost, floor or dash??
    Are you getting heat on both sides.

    Post your results, I&#146;ll try to interpret them for you.
  • narya77narya77 Member Posts: 4
    HI Blendor,

    Thanks for your reply. Sorry I was out of town and could not see your reply.
    I did as you had suggested and I am getting error code 52.

    As far as symptoms are concerned. I hear the blower working. I feel no air when setting is at floor or direct (dash). However I feel air when it is in defrost mode. There also I don't think it is coming 100% but it is there.

    There is no heating or cooling from either side as there is no air flown on either side.

    Thanks for your help and I look forward to your reply.
  • shelley91935shelley91935 Member Posts: 2
    I had a 2000 Jeep GC with the "A/C not blowing out of center ducts" in 2004. When I went to the dealership they "Removed battery tray and repaired vacuum leak" this also had to be done again in approx 2009.
  • narya77narya77 Member Posts: 4
    Tx Blendor! I have ordered the fix you have suggested. I will update you with results. Thanks for your help!
  • daniellouisdaniellouis Member Posts: 1
    edited April 2010
    I have a JEEP GRAND CHEROKEE 5.2L , 1998

    The heating is in trouble : whatever temp I request, it blows hot air, without possibility to lower the temperature.

    I have done the skech to get the errors messages from the HVAC system ; the fault codes give N° 23 and 38

    What will be the further research of the default ?

    Thank you
  • blendorblendor Member Posts: 23
    Hello Daniellouis:

    The fault code #23 - Door travel range to small -- is a blend door actuator drive circuit problem.
    The #38 &#150; Circuit was open -- is a blend door feedback circuit

    It looks like you may have an actuator motor problem or the coupler that connects the actuator motor to the blend door could be broken.

    Remove the actuator motor on the bottom of the HVAC box to examine the coupler.
    While the actuator motor is off try turning the shaft of the blend door to see if the air flow temperature will change.
  • elidonelidon Member Posts: 1
    I live in FL & my GC blows warm, pretty soon hot air. I took it to the dealer and they said that I need to replace the compresor and in order to do that, they need to take the whole panel out and it was going to be around $1000. I really don't trust them, but, I am a girl clueless in what to do, but I would like to learn so if I can fix it, I will, or if I take it to someone they will fix it w/o riping me out. Can you give me some ideas and suggestions in what to look for. Thank you very much.
  • tom5571tom5571 Member Posts: 7
    Beware!!!!!!!!! First off the compressor is under the hood attached as an accessory to the engine and driven by a belt. This problem could be a couple of problems 1) a compressor failure, which will require a system flush and compressor replacement. 2) the clutch on the compressor may have failed, which can be replaced. 3) it could be as simple as low freon, caused by worn seals in the system,replacement seals cost about $5.00 plus the cost of recharging the freon. Do your self a favor and stop at a local auto parts store and ask questions.
  • narya77narya77 Member Posts: 4
    Hi Blendor,

    I got the kit u suggested. However, I am not able to fix the problem as the recric door is not comeing up. Do you have a video of how to use this kit and fix the problem.

    Thanks!
  • scootertramp40scootertramp40 Member Posts: 2
    hi guys i have a 1999 grand cherokee limited and i have no heat/ac air flow at all all the atz lights work and i got the following codes ,16,42,52,54, i did notice one day after i had shut off the vehical it sounded like the vent flaps had open and close like 5 minutes after i had shut the ignition off and had been sitting there.i do not hear the blower motor but i do hear a low level buzz like an actuator motor trying to move .can you guys help?
  • blendorblendor Member Posts: 23
    Hello ScotterTramp40:

    16 = Right temperature door not responding
    42 = One of four motor drivers had drive 9A9 shorted to ground
    52 = AI (Recirc) door travel range too large
    54 = Left temperature door travel too large

    The codes show you are having problems with a blend door, a blend door actuator motor, and the recirculation door.

    But the main problem sounds like you are having trouble with the blower.
    No air flow and if you can NOT hear the blower motor when it is set on HI, that is a symptom of a bad blower motor, blower motor control module or the blower wheel assembly.
  • tiredofmyjeeptiredofmyjeep Member Posts: 1
    I have a 1996 Jeep Grand Cherokee I call the money pit. We had to get the transmission fixed a couple months after we got it, We had the water in the passenger floorboard and changes a heater core (that was fun), found a hole without a plug on firewall, and finally figured it must be the drain plug on a/c. That was very interesting to find. We fixed it when we located it but not by the means mentioned here. (ours was much more difficult) Funny thing is the previous owner must have thought it was something else because there was lots of stop leak in the radiator over fill thing. That was fun to attempt to clean. Wish I would have been here sooner. Water pump has also been changed.

    Problem now is the A/C blows hot air. The heat works decently but not on floor setting. When you are driving and accelerate it just switches itself to the windshield vents until you let off on the strain you seem to be putting it in. If you turn it to vent it is hot too. Can anyone help solve my problem? I do not have the dual control that has been mentioned.

    Help .... this thing is breaking me but its paid for and that is why I keep it.
  • blendorblendor Member Posts: 23
    Hello Tiredofmyjeep:

    Your symptom of the air flow changing locations on acceleration, sounds like a mode door problem.

    Your AC blowing hot air, could be from a minor leak in the AC system that would only require a recharging - to a sensor in the transmission.

    Some repair manuals will give a few tests to do on your own, but if they are not the problem, you could be wasting your time or changing parts unnecessarily.

    To diagnose the AC you need the proper equipment for testing the system.
  • tuggajbtuggajb Member Posts: 646
    sounds as if you have a vacuum leak there is a hose that goes under your battery to the front of the jeep to a canister check that I would change it as is getting old and dont cost that much for hose
  • 2005jeannie2005jeannie Member Posts: 1
    Unit was blowing cool to warm air. Last night added 14oz can of freon. Today, 95 degrees outside, a/c blows barely cool air. Tonight tried to add more freon,with the charging & measuring kit. This gauge registers in warning zone 70-80 as I try to add the freon. Compressor kicks on, runs for a few seconds to almost 45 seconds, then shuts down. Engine has been running for several minutes now and the a/c is blowing warm air, no cool air what so ever. What do I do now?
  • kmckenziekmckenzie Member Posts: 3
    - Radiator fan has stopped working. Jeep will overheat if sitting still, but is just fine when moving. Any ideas?

    - A/C is only blowing out of defrost vents no matter what the dial is set at

    Any help on these would be much appreciated.
  • woodogwoodog Member Posts: 3
    edited June 2010
    My 1999 Grand Cherokee Limited overheats only when the A/C is on. I replaced the thermostat before actually analyzing the problem, but have determined it is only when A/C is on. Any ideas?
  • tuggajbtuggajb Member Posts: 646
    ose electric fan come on when you turn on ac
  • socaldonsocaldon Member Posts: 4
    Mine is doing a similar thing - air is nice and cold until I drive up an incline (I suppose the engine is under strain so this is the same symptom as yours). The air just switches itself to the windshield vents until the road levels out. I did have problems with the vacuum tube but managed to fix that - only have the problem on hills now.

    I haven't got a cure as yet but am working on it - will report back if i find the answer.
  • woodogwoodog Member Posts: 3
    The fan comes on when it starts to overheat, but I don't believe it does simply by turning on the A/C - I'll have to check that.
  • tuggajbtuggajb Member Posts: 646
    needs to come on when you start ac
  • tuggajbtuggajb Member Posts: 646
    sounds as if the vacuum hose under the battery is cracked leads to a reservoir behind the front bumper
  • jeepdixiev8jeepdixiev8 Member Posts: 2
    "When you are driving and accelerate it just switches itself to the windshield vents"

    I found that after time it will stay on just vent.

    I fix the problem on my 94 GC by bypassing one of the levers that controls the flap for the diction that blows at you, found behind the steering weal, made a sml bracket to space it so it was fully open. Started the jeep up to find out that it fixed the whole problem.
    Also replaced the one way valve on the block 4.99 part.

    Cant believe it was that easy.
  • woodogwoodog Member Posts: 3
    Double checked and fan turns on when car is started and stays on when the A/C is turned on.
  • socaldonsocaldon Member Posts: 4
    That sounds encouraging - thanks for the tip. Whereabouts is the lever located exactly? Does the dash have to be removed or can I access it from under the steering wheel?
  • barryzbarryz Member Posts: 43
    Very common problem, probably the fan relay, I learned that when mine broke. I believe it is probably located on a 2001 the same as my 1999. It is not in the relay box under hod, it is its own separate relay, which is very hard to do, below the passenger side headlight(take it out), there may be a whole cut where you can access it, or you can cut one. the by the book way is to take bumper off. I took mine to a good mechanic who charged less than dealer. He had to order the relay from dealer, there is no aftermarket. All told parts and labor i spent just under $200. the part i believe is around 80, if you do yourself, remember no shortcuts, the relay must mount tight to make a good ground or it will blow. If you know the method of turning key on and off a certain number of times to get a code, it will give the code that represents fan relay-by the way if this is the problem, you will have a check engine light on, do you? Also check your under hood fuse box first, there are i believe 2 fuses related to this system.
  • kmckenziekmckenzie Member Posts: 3
    The check engine light is on. When I had it check the code read for an emissions leak. I never took it any further. I did check the fuses under the hood and both are fine. I'll probably take it to my mechanic. Thanks for the help
  • tom5571tom5571 Member Posts: 7
    My 2000 GC had the same problem, relay is located on the passenger side front wheel well. I removed the headlight assembly, located the relay mounted on the wheel well secured by 2 screws and drilled a 1/2 in hole and used a 1/4 ratchet and socket to take the relay out. Be advised you also need to take the battery out as well.
  • rumraisinrumraisin Member Posts: 1
    I just charged up my A/C recently. The temp here in town is around 90 degrees and humid, while running my air all of a sudden my car over heated, brown coolant was pouring out. When it cooled down and checked it their was not actually a lot of coolant missing, it took about a half of a 1gallon jug of water to refill the reservoir. When i drove it home I ran the A/C turned the heat on, and no temp change of around 190 on the gauge.. I had the sensor in the front bumper replace a year ago.
  • jeepdixiev8jeepdixiev8 Member Posts: 2
    You have do some acrobatics to get to it o and watch out for the light under the dash it a hot, only one Philips head screw is all that hold it in place. look for the green vac hose under the dash underneath the steering column.
  • willscowillsco Member Posts: 1
    Hi - we have (UK Model) 1996 Jeep Grand Cherokee with heater blower which wont turn off. I have found by trial and error that by removing the large 40amp fuse from the fuse and relay unit under the bonnet - left hand side of engine bay (fuse was on lower row - 2nd in from left as you look at it from front of car) I am guessing that on the '96 model there is a relay module somewhere which has probably failed closed circuit - I have unplugged and plugged back in all the relays in that unit - but to no avail... can anybody advise where heater blower relay is on 96 UK model? Many thanks
  • rghill95746rghill95746 Member Posts: 1
    I have a 2002 GC Limited. I have replaced the resistor for the blower motor. I have checked to see that the blend doors are operating (and they are). I cannot feel any air through the dash, floor, and very little through the defrost. I do have AZC. I have tried almost everything (with the exception of a stick of dynomite,lol). Any suggestions. I have run the diagnostic and found codes 54, and 52. I did try to reset the door limits but still nothing. HELP?
  • topat46topat46 Member Posts: 20
    You have a blend door problem. Code 52 and 54 usually means the doors are broken. I experienced the same on my 2004 GC Lmt and made the repair from behind the glove box. Look on E-bay for the kit. It is better than paying $1200 plus to the dealer. Click on the attached. It is the fault codes.

    http://www.wjjeeps.com/climate.htm
  • blendorblendor Member Posts: 23
    Hello rghill95746:

    If you do not get any air flow thru your HVAC system but you can still hear the blower motor working.
    That is a sign the door has completely broken and has fallen down blocking the air flow into the HVAC box.

    A short descriptions about the recirculation door. It blocks off one of two vent openings.
    One vent opening takes air from inside of the vehicle and the other vent opening takes air from the outside of the vehicle. (The exterior grille area at the bottom of the windshield)

    Since you have the fault code #52, I recommend that you check the recirculation door manually.
    If you lower the glove box and look to the top right side of the glove box opening. You will see a grill Or grid like area. That is the recirculation door housing. If you look inside the recirculation door housing you should see a gray colored foam door up against the grid area or back against the exterior air intake opening.
    A flash light would be helpful.
    If you do not see the gray foam recirc door, it has broken off and fallen down blocking the air flow thru the blower.
    You can lift the fallen recirculation door up off the blower and the air flow will be restored.

    1. To lower the glove box. There are two plastic tab stops sticking up past the top back wall of the glove box that hit against rubber stops. Fold these rubber pieces to the side (They are attached only on one side so as to act as a hinge point)
    2. Remove the dampener arm on the right side of the glove box by sliding the end up and out of the key slot. The glove box should be hanging down at this point.

    Again if you can hear the blower working, but you do not get any air flow thru your HVAC system.
    That is a sign the recirculation door has completely broken and has fallen down blocking the air flow into the HVAC box.
  • kfleischhauerkfleischhauer Member Posts: 1
    I have recharged my ac and then also replaced the pressure switch. After replacing the switch the ac blew super cool for about a week. Not it is back to blowing hot air. Any suggestions on what it might be?
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