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Jeep Grand Cherokee A/C Heating Ventilation



  • I have the carpet pulled back most of the way right now to dry it out. Have not seen the drain but maybe need to go a little farther back with the carpet. Will look in the morning and also at the web sites. Many thanks.
  • wschillerwschiller Posts: 2

    I have a 1998 with the same problem. The drain exit port is not visable on the engine side of of the firewall because it terminates behind a frame gusset. If you look at the A/C unit under the dashboard, you will see how the A/C enclosure slopes down and towards the inside of the firewall. This is under the the Evaporator Housing. Coming down from the sloping housing you will see a 1-1/2" is wide black plastic duct that terminates in a flat circular shape. This is the drain exit port through the firewall. I drilled a 1/8" hole in the center of the circular shape after which I was able to clear the blockage with a 1/8" piece of electrical wire. I then resealed the hole with a machine screw.

    Good Luck.

  • compressor will engage in defrost mode.but will not engage in normal a/c mode. Any ideas ??
  • tuggajbtuggajb Posts: 646
    ac on off button switch probb bad
  • 95zjtom95zjtom Posts: 8
    We had this problem on my wife's 95 GCLtd about six or seven years ago. I took it to a Jeep dealer and they found a technical service bulletin that told them the drainage area gets clogged with leaf and other organic debri. The tsb said to drive a 1/4 or so hole in the plastic air conditioning box just above the passengers feet. This box is rounded and the hole should be drilled about in the middle. Have a coffee can or something ready as you most likely will see water pouring out once the hole is made. After the water stops running out. take a can of compressed air or an air blaster tip attached to an air compressor and blow air into the hole. This will blast out the debri that has collected in that compartment from the engine cowling area. If you get the hole in the middle, you can actually poke a wire or thin wood dowel all the way through the other side. When you think you have the debri cleaned out, plug the hole with one of the plastic plugs that are used to hold plastic body parts on. Seal around the plug with silcone gasket cement.

    I have done this same thing on my 95 GCLtd with success also. I have since installed drain tubes on both Jeeps so I don't have to go back each year and clean out the air conditioning box. If you want details on how to do this let me know.
  • I for one, would greatly appreciate any details. Our 95 GCL has been in the shop 3 or 4 times over 3 years to the tune of about $1500 and still no permanent fix. We do have a mechanically minded friend who could do this for us though if we had the specifics. Many thanks
  • jaf6jaf6 Posts: 1
    I have a 2001 grand cherokee loredo and no matter what i turn the controls to it only blows out the defroster any ideas thanks.
  • Sparry
    I have an 04 GC with the same problem. Under warrenty the dealer replaces condensor, evaporator and who knows what else. A/C worked for awhile and quit again.
    How did you fix yours. Thanks Steve
  • I have a 96 Grand Cherokee Laredo with the v8 and the other day we discovered a leak in the passenger floor boards and discovered that the a/c is not leaking the condensation off under the jeep like it normally would except it is coming in the floor some where I did what every body has said to do including the a/c shop in town by drilling a small hole in the duct work down under the dash so we did and nothing happend we noticed later it leaked outside the jeep like it should thought we had it fixed but no i was wrong it is still coming inside what do you recomend????
  • blendorblendor Posts: 23
    There are a few things that could be the problem.
    1. The mode control switch could have failed at the defroster position.
    2. The mode door actuator motor has failed.
    3. The mode door could be broken.
    4. The defrost door actuator motor has failed in the open position causing most of the air flow to be directed to the defroster vents.
    5. The defrost door could be broken.
  • 95zjtom95zjtom Posts: 8
    Sorry about the delay in replying to your request for more information on how I fixed the irritating air conditioning condensate water flooding the right side floor on both of our 95 Grand Cherokee Limiteds. We first noticed this problem with my wife's GCLtd about seven years ago but the water came out the air vent to the right side passenger's floor. On my 95 GCLtd the water came out onto the front passenger floor.

    My remedy is first to obtain the "plumbing" parts listed below. I bought these at the Home Depot but any good hardware/home supply will have what is needed. I will include pictures which should help illustrate the fix.

    One plastic elbow with a hose connector (hose barb) on one end and threads on
    the other side. One plastic elbow with a hose connectors (hose barb) on both ends. Approximately one foot of plastic tubing. One the Jeep illustrated I used clear tubing but on my wife's Jeep I used black reinforced (as in fuel line) tubing.
    The important thing is to puchase the correct size tubing to fit the hose connector end of both elbows. As for the threaded end of elbow used at the air conditioning duct - you will need a thread tap of the correct size. You should also have availalbe some RTV silcone gasket cement or another brand of silcone sealer (as in 3M).

    For installation, drill the correct size hole in the center of the round water collection point in the air conditioning duct and use the thread tap to cut threads for the elbow. Drill a second hole in the floor just large enough to insert the one end of the second elbow. I drilled it in the flatter floor area and just through the first layer of sheet metal. This hole will let the water drain out onto the ground from this new location.

    Screw the threaded end of the first elbow into the hole you created in the ductwork. Push one end of the tubing onto the hose barb end of this elbow and the other end onto the hose barb end of the second elbow. Insert the other end of this elbow into the hole drilled into the floor. I then used the silicone sealer around the elbow threads in the air conditioning ductwork. There is no pressure so if you got good thread cut into the ductwork you may not need the silicone sealer. I had some on hand so I sealed it up (see the blue stuff I smeared around the elbow).

    As I mentioned, this fix is working great for us and I no longer have to clear out the hole in the firewall of the debris. As was mentioned by some posts, it does help if you do not have to park under trees. I have used a hose to flush out some of the debris but holding the end of the water hose over the cowling and letting it flow. I have also sprayed a hard stream of water into the holes in the firewall behind both front tires. I do agree that Chrysler/Jeep did not get the design right so the debris will flush out by itself but are other manufacturers better in this design?

    <img src="c:\acfix1.jpg"

    <img src="c:\acfix2.jpg"
  • tidestertidester Posts: 10,110
    The pictures you tried to post don't show up because, fortunately, we aren't able to read files directly off of your computer! :)

    The easiest way to post pictures is to place them in your own personal carspace and link to them here. You can find your carspace by typing "" followed by your username (no quotes!) into your browser's address bar.

    tidester, host
    SUVs and Smart Shopper
  • 95zjtom95zjtom Posts: 8
    I thought I was including the pictures correctly - but I was not.. The pictures showed up when I previewed my post but I have since been enlightened. I neeed to upload the pictures to my CarSpace. I have done that and I will attempt to add the pictures to this reply. .html#pic .html#pic
  • 95zjtom95zjtom Posts: 8
    Thanks - that makes sense why the preview showed the pictures. I had my wife this morning get on the forum as a guest to verify the pictures did not show up.

    Since then I added pictures to my CarSpace album and created a reply the post I made last night with the url for each picture. This should work better.

  • awiggieawiggie Posts: 1
    Hi. I have an 05' Grand Cherokee and am having issues with the blower settings working for my heat and a/c. I called the dealer and was told that it was the blower motor resistor. Replaced it last Tuesday and was working great and now only when it wants to on all settings and only on hi all of the time. Not sure if I should replace the part again, maybe defective??, cheap part only $5.00 but a pain to put in. Any info and/or advice would be a great help. Thank you! :)
  • gwd601gwd601 Posts: 8
    I'm about to "do battle" w/ my 01 GCL regarding stuck blend doors. Same problems as others have experianced, heat on drivers side and cold on the passenger side, except when the blend door behind the glove box sticks or slips or whatever they do, then there is no heat at all except insde the box it'self. Anyone have any suggestions besides removing the entire plentum box and replaceing all of the componets?
  • gwd601gwd601 Posts: 8
    I have an 01 GC limited and have been into the driver's heated seat problem. I learned from the dealer that the correct way is to replace the leather covering of the seat because the elements are sown in when it is made. $1200 plus labor. I took my seat aprt and found the bad element and cut it out of the circuit (by-passed) That was a year ago. So far so good! gwd601
  • tuggajbtuggajb Posts: 646
    look on ebay for jeep blend doors repair some one has a kit with instructions cost bout 150 or so
  • gwd601gwd601 Posts: 8
  • I have a 2000 Limited 4x4 (Quadratrac). My issue is the heat works fine for about an hour but then blows cool/cold air after that. Any suggestions?

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