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Chevy Suburban and Tahoe AC and Heater Problems



  • whiteelephant said: I'm very frustrated, and by Texas Lemon Laws these people have 3 attempts to fix the same problem. This is now their 3rd attempt.
    Make sure you document your three attempts to get the vehicle fixed. Keep all your service repair orders...and make notations about what they said concerning GMs comments that "this is a common problem but we don't know how to fix it". Make note of the the names of the dealer/GM people involved. To tell you that this is a common problem and they can't fix it is absurd. I would start working the dealer right now for a swap into a brand new '08. Let the dealer worry about the fix. If they won't do that then you should would start the Lemon Law proceedings immediately.
  • Hi, I have a 05 Suburban LT and just recently the blower motor for the front heater keeps running after the ignition is off. I opened the hood and pulled the fuse which temporarily fixed the problem, but now every second or third time I run the heater it happens again. I don't understand how it is getting direct power after the ignition is off and the keys are in my pocket.
    Anyone with a suggestion...please reply.
    Thanks from ice cold Ontario Canada.
  • As I was registering for this forum to comment, my dealer called and told me that I definitly had a short in the resistor control module causing the "mind of it's own" . They replaced it and fixed a leak in my front axe. Both under warrantee, thank God I bought the extended warrantee at the time of purchase last Feb. Good luck with yours.
  • I have the same problem with my 2001 Tahoe as well, thanks for the information. Did you install the flapper valve yourself and if you did how much work was involved?
  • 1999 Chevrolet C-1500 Suburban ... Can anyone tell me wher the Cabin Air Filters are located ? Thank You
  • My '04 z71 Tahoe's air conditioning periodically shuts itself off. The a/c will be nice and cold; without warning, very warm, humid air starts coming through the vents. I've had it into the dealer many times, but of course, it never happens for them. What could the problem be?
  • I have a 95 suburban. All the settings on the heating control work accept for the defroster. I can turn the dial to that setting but nothing happens, and in Michigan, that is not a good thing. Any ideas as to what is wrong and how to fix it?
  • In my 1500LT the fully automatic air con switches from blowing cold to hot or hot to cold only when the temperature selection is turned up above 90 degrees (or to 89 degrees or lower). On fully automatic the system will keep blowing hot (90 degrees or above indicated) or cold (89 degrees or below) AND NOT STOP.....

    Can anyone suggest where I start trying to cure this.

    I was thinking either of the aspirator (cabin temperature sensor in the roof lining) or the thermistor sensor in the footwell) - but which should I try first.

    As a related question can anyone suggest a decent scanner to connect to the vehicles electronic systems - and would they show the sensor readings?

    Any help greatfully received as I am over in England and there is just 1 authorised dealer for these vehicles.

    cheers and ta-ta from Julian
  • I have a 2003 Suburban I purchased about a year ago. About 3 weeks ago my battery went dead, I found out at that time that the heater fan is stuck on even when the car is turned off and the keys are out the fan still blows on low. I now have to remove the negative cable to the battery every night to avoid waking up to a dead battery. Has anyone else experienced this problem? If yes, how did you resolve the issue? What part caused the problem?
  • I had the same problem with my 03 Tahoe Z71. I had to replace the blower module, the blower circuit had failed.
    Parts: $117.48
  • denkatdenkat Posts: 2
    Thanks whorider for the response, it was indeed the blower module, $133.10 for the part $98 for the labor. That was a bummer, I'm just glad it's fixed. Thanks again.
  • The background of the problem is that I had absolutely NO control of my rear climate control. The blower motor always stayed on. even ran the battery dead. I replaced the ballast resistor and the fan ceased to run 24/7. I then had no control of which vent the air was coming out. I replaced the rear temperature sensor (little speaker looking device), and now I can control the transfer between the floor vents and the celing vents.

    Now the problem is I cannot get ANY heat. Is there something I'm missing?
  • I have a 04' AC works fine on drivers and pass' side drivers side blows cold no matter where the temp control is set. I can change it from floor to dash to defrost but it is always cold air. the passengers side get nice and toasty. Does this sound like an actuator?
  • okctahoeokctahoe Posts: 4
    First my speedometer stuck and went out in 2005. About the same time my stereo stopped working and also my a/c would blow out the defrost when it was positioned on face.

    I took it to the dealer and they replaced the dash panel where the speed controls are but the other two issues had sub-sided at the time. When they messed up again and I took it back...again they were unable to find anything.

    Now that the car is out of warranty the control is completly stuck on matter what you do that is the only place it will blow out. My husband got a geniune AC Delco replacement, brand new and installed it and it is still not working....Anyone know what to do? I am about fed up with GM!
  • They found a bad ground between the sensor in ceiling and climate control. They fixed the ground and it works. I could bet you have the same problem.

    Good luck
  • okctahoeokctahoe Posts: 4
    My husband replaced the control panel with a brand new ac delco part and it still won't blow anywhere but out the defrost and on your feet.

    I complained to GM twice about this when it was still under warranty but it started working again before they had the chance to check it. It was always sproadic until now it has been stuck like this for over a month. And of course out of warranty. Anyone have any suggestions.

    I already had my instrument panel replaced and my stereo sproaically goes off and on as well. I think the entire dash has issues in the GM SUV's personally from eveyrthing I have read on here. PLEASE HELP!
  • Somehow something got stuck in the fan motor inside the dash. How do I access the fan?
  • rockman59rockman59 Posts: 250
    okctahoe said: I already had my instrument panel replaced and my stereo sproaically goes off and on as well
    I assume the instrument panel was replaced under warranty therefore you have proof that the stereo problem could be related to the replacement, likewise the AC problem which the dealer failed to repair when the vehicle was under warranty. I would go back to your dealer and demand that they fix the stereo and AC as a warranty item.
  • jjejje Posts: 1
    I have a 2002 Chevy Tahoe. I have noticed that some of the back lights on my dash board switches have went out, but everything still works. ex.. defroster button. Recently when I try turning on the AC it will blink a couple of times then turn back off, most of the time it is when I idle. Sometimes once I get going or at times even as soon as I crank the truck it will turn on itself and work fine. When it is on it blows cold and works fine. Could this be electrical or the AC itself??
  • 96gmcburb96gmcburb Posts: 2
    Hello, Nice Place ya got going here!

    I just bought a 1996 Suburban 4x4 5.7L

    The front AC works, but the blower will not work on the "HIGH" setting If i toggle the switch back & forth i can hear a clicking under the passenger dash area when its clicked into high.

    the rear AC does NOT work, however when i use the switch i can hear the same clicking noise thru all speeds ( Lo - High) when i toggle the switch.

    So, I have a Several questions:

    (1) Is This usually a blower motor issue--- or a switch issue ( Both front and Back)

    (2) From the clicking sound, is there a blower motor in the back on the passenger side as well?

    (3) Are these Jobs easy to access and fix from inside the cabin?

    Thanks for your time!
  • alawinalawin Posts: 6
    I have a 2001 suburban. The ac switch seems to work, light comes on when depressed, goes off when pushed. However, the compressor seems to run all of the time regardless of the switch setting. Any ideas? is this normal. I do not have the vent controller set on defrost.

  • kiawahkiawah Posts: 3,666
    Had a 97 sub (replaced now with an 07), so can help a little.

    In regards to (2), the rear unit has it's own set of circuitry, blower, ductwork and sensors. You can find it along the right rear. The bulk of it is in the far back, but ductwork and sensor runs all the way up to the 2nd door on the right. Access it from the far back.

    I still have my factory service manuals, so can look up something for you if you have a specific question.
  • kiawahkiawah Posts: 3,666
    There is a set of high and low freon pressure switches, which control relays, which controls the operations of the a/c compressor clutch.
  • alawinalawin Posts: 6
    Thanks for the response. However, I fiddled around some more and found something interesting. The compressor stays on continually (regardless of ac switch position) only when I have the recirculate air selected. The ac switch functions normally when I have the fresh air selected.
  • alawinalawin Posts: 6
    I can hear a click when I hit the window button from either the driver's door or the affected door. I would normally think this was a motor that needs to be replaced. However, there was a brief period when the window started working, it functioned normally for about two weeks then quit never to work again. I can still here it picking the motor when the switch is depressed. I dont want to waste the money on a motor if I have a short. Any ideas? thanks.
  • hand3hand3 Posts: 1
    I have a 2002 5.3 liter tahoe. For the past year the rear a/c, heater, and blower ... for no reason will stop working. Then later on ... after the vehicle has been parked and resterted ... the overhead selector switches, for the rear a/c, would begin operating the system again. Then after a few more months, only the front overhead a/c controls would operate the rear a/c, heat, and blower. But as I said earilier, for no apparent reason, the rear blower would stop blowing. Now nether the front or rear, overhead controls will operate the rear a/c, heat. or fan. it's hard to believe that both switch panels are defective. The front passenger a/c, heat, and blower works fine. Any help would be appreciated.
  • jweast99jweast99 Posts: 1
    I have a 2001 Suburban. The air conditioner works fine, unless the car is wet (after rain or car wash) the light on the dashboard won't light and the A/C won't work. This happens whether the car is idling or moving. Once the vehicle dries off the A/C starts working again. Not sure what is causing this. Any ideas?
  • camocavcamocav Posts: 7
    It seems when I'm stopped at a light, sign, or wherever, but in gear, I get a load vibration under/behind the firewall. A GMC deal informed me of a Tech bulletin as the HVAC/exhaust was part of the problem, but a $130.00 for clamps and $80.00 for labor(my GM extended warranty wouldn't cover it either). would do the trick. I checked the exhaust system and it was NOT vibrating, so that was out. As fo the HVAC, ?? So, I read a post by Arrie on adding a can of oil treatment to their Tahoe's AC system due to compressor noise. I'll see how it works, hopeffully it does as the vibration is load at times. Anyone else have issues like this?? :confuse:
  • 96gmcburb96gmcburb Posts: 2
    Well yeah would you look up what the parts are called?

    i know blower , but there is a black electrical box that seems to be the area the ticking is coming from it is in the back up and towards the third seat under the side cover .....what is it called?

    Thank you ,

  • kiawahkiawah Posts: 3,666
    Well I'm looking in the manual, and I don't see the break out of it, but I know it's here in this manual somewhere....since I had to get into it a couple of times when I owned it. Here's what I remember, so this is all from memory..

    There is the blower motor, with a resistor bank in that housing, which is what drops the blower speed to lower voltages and slower blower output. The resistor bank is cooled by the air flowing thru the blower motor. There are a couple of relays, which switch the resistor in and out, slowing the speed. Further up, as I recall about half way, is a plenum mixing door which is basically adjusting the temperature by adjusiting how much air goes across the heater/ac coils. Also as I recall, all the way up in the plenum output by the 2nd seat door, is a sensor which is what it determines to monitor the output temperature of the air.

    I had a situation once where the blower was running all the time, turns out it had a bad relay (in the back controlling the blower motor). That was replaced by the dealer under warranty, I don't remember if there was a TSB on it or not.

    If you hear clicking back there, it is most likely the relay controls.
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