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Chevy Suburban and Tahoe AC and Heater Problems

358 messages,  Last post on Apr 18, 2013 at 11:37 AM

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What is this discussion about? Chevrolet Suburban, Chevrolet Tahoe, Chevrolet Tahoe Limited/Z71, SUV

    

Messages Page 8 of 37

#65 of 358 tahoe climate control problem by hand3

May 29, 2008 (5:15 am)

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.

#66 of 358 A/C Problems only when wet by jweast99

May 30, 2008 (2:08 pm)

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?

#67 of 358 2004 Suburban w/vibration when stopped w/AC on by camocav

Jun 01, 2008 (3:22 pm)

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??

#68 of 358 Re: 96 Suburban Front and Rear Air Issue [kiawah] by 96gmcburb

Jun 02, 2008 (7:21 pm)

Replying to: kiawah (May 10, 2008 6:41 am)
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 ,
 
96gmcburb

#69 of 358 Re: 96 Suburban Front and Rear Air Issue [96gmcburb] by kiawah

Jun 04, 2008 (2:07 pm)

Replying to: 96gmcburb (Jun 02, 2008 7:21 pm)
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.

#71 of 358 2002 chevy tahoe rear air not working?? by dwalton1

Jun 09, 2008 (1:11 pm)

rear air not working at all front works great .I checked fuses under hood and dash .Just need some help

#72 of 358 Re: tahoe climate control problem [hand3] by calipag

Jun 19, 2008 (4:25 pm)

Replying to: hand3 (May 29, 2008 5:15 am)
I am having the same problem, did you ever figure out what was wrong?
 
Thanks

#73 of 358 Re: 2002 chevy tahoe rear air not working?? [dwalton1] by domabros

Jun 20, 2008 (5:02 pm)

Replying to: dwalton1 (Jun 09, 2008 1:11 pm)
Front air is ice cold on my 99 suburban,rear air not.Vent door selectors are both working in rear,one for heat or a\c,one for floor or ceiling.Any suggestions?

#74 of 358 2007 Tahoe AC blower problem by nflguy

Jun 23, 2008 (2:29 pm)

I have a 2007 tahoe LT3 that I bought in October 2007.
 
In Dec 2007 the readout on the dash (where you can view the odometer or the tire pressure etc) went haywire. Instead of the usual stuff it displayed some random numbers and was stuck on that screen. 20 minutes later it suddenly started working fine. I brought to dealership and they said nothing was wrong.
 
My XM radio will go out briefly now and then and I don't live anywehere near tunnels, mountains etc. I could be in the middle of a parkinglot and suddenly lose reception. This is weird becuase XM is sattelite.
 
Now for the bigger issue:
 
Around March I noticed that the blower speed seemed to fluctuate without me touching a thing. I would set the fan speed to a middle setting and then while driving it would go up and down. I called the dealer and they told me to turn on the max air/recirulator button that would fix the problem.
 
It didn't fix the problem so i dropped my tahoe off at the dealer. They kept it overnight and told me everything was fine. They said that if the fan speed was having problems there would be a code and they didn't find any codes...
 
Now it's late June, 2008
 
My fan speed fluctuates wildly while driving(i never use the auto function).
 
The Max air/air recirculator button will turn off on it's own!!!!
 
I called another dealership and they said it could be a problem with a blower resistor or the control head BUT the only way they can replace those items is if the onboard computer shows codes indicating those items need to be replaced.
 
ANY help ior suggestions would be greatly appreciated.
 
You can also email me at jjdavis49sbcglobal.net

Messages Page 8 of 37

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