GMC Yukon AC and Heat Questions

shaffer17 · December 2009

I recently prurchased an 04 Yukon. I was having trouble getting the rear heater to blow hot air, then when trying it today, plenty of hot air is coming out but I can't turn it off. Any ideas?

mgdriver73 · December 2009

Anyone know how to fix/troubleshoot rear only blowing cold air? Front works fine.

druth · December 2009

Have the same problem with 2003 Yukon. Any replies ?

clemmdog · January 2010

So, I read through this whole thread. I am having the same problem with one side of the car blowing the right temperature and the other side blowing the wrong temperature. I plan on trying to reset the control module later this week. But my question is this...

In looking at the car's manual, I see a left side and right side Air Temperature Door. It seems to me that this is likely the problem. Unless the control module is not sending the right information, which I suppose is a possibility. But for those who have my problem, does the simple reset work or does the problem return?

holyfield · January 2010

I am having problems in the morning warming up my truck. No matter how long I leave it running with the heater blowing full blast it still will not blow hot. Once I am on the road it eventually starts to blow hot and will get cool again will sitting at red lights. ????? Whats up!!!!

rsht · January 2010

I am guessing its your thermostat stuck in the open position...

yukon03 · January 2010

Greetings! I wanted to know if you fixed your rear heater issue on your Tahoe! My 03 Yukon does the same thing and when I took it to my local GMC dealer they told me it needed a rear AC control module and an actuator and would cost $600 to fox. Forget that! I went to my local Barely Used Auto parts salvage yard and picked up the parts for $50 but that did not fix the issue. Wondering what you found out with yours. Your input will be greatly appreciated!

drintn · January 2010

Hello,
I am at my wits end!! Where to begin? This 2004 GMC Yukon problem is only on drivers side front. It has dual (slide) controls. Last summer the AC would suddenly stop blowing. Each time I would stop, turn off the ignition and re start the vehicle. Problem solved every time(5 or 6). I do recall a slight "ticking" sound when this was going on. Then it stopped. Then, while using the heater, only cold air comes out of the front drivers side vents. I did some research and changed the drivers side air door actuator. I took off (+) battery terminal, unplugged actuator(#604-106), replaced actuator, plugged it in, put (+) battery terminal back on, turned on key(without starting) waited 60 or so seconds, started and....... STILL BLOWS COLD AIR!!!!!!!

thechadly · February 2010

i have been getting heating issues with my cimate control. the heat only works on full heat or 90 degrees. if i drop to 89 it turns cold. does anyone have some suggestions to fix this?

thechadly · February 2010

i see all of the post for resets. i do not know how these are done. it seems to be an electronic issue but who knows.

pocok · February 2010

You need to change the inside temperature sensor (aspirator) Parts# 025903301
You can find in the headliner above the driver head where the little vent is

thechadly · February 2010

wow, i bet you are right, i unplugged it a while ago because it was making an awful buzzing noise. i thought it was for the on star? so how do i stop the buszzing.

pocok · February 2010

"> only one way change it, just $45 and Your heating gona be work with no buzzing.
After You change the aspirator disconect the battery for a few minute. Reconect the battery, turn on the ignition and wait min 40sec without touch any button on the heater control. After 40sec You can start the engine and adjust the temperature

drintn · February 2010

any chance you could help me with my 2004 yukon problem....i am runnin out of ideas

2004 GMC Yukon problem is only on drivers side front. It has dual (slide) controls. Last summer the AC would suddenly stop blowing. Each time I would stop, turn off the ignition and re start the vehicle. Problem solved every time(5 or 6). I do recall a slight "ticking" sound when this was going on. Then it stopped. Then, while using the heater, only cold air comes out of the front drivers side vents. I did some research and changed the drivers side air door actuator. I took off (+) battery terminal, unplugged actuator(#604-106), replaced actuator, plugged it in, put (+) battery terminal back on, turned on key(without starting) waited 60 or so seconds, started and....... STILL BLOWS COLD AIR!!!!!!!

pocok · February 2010

you have 3 actuator, right side temperature door actuator, left side temperature door actuator, mode door actuator. Witch one you allredy replaced, where is located. driver side under the dash, right side under the dash or top of the dash under the dash cover

yukon03 · February 2010

I have replaced the module and the actuator and still have no heat in the rear of the vehicle. Any ideas?

pocok · February 2010

when the engine is hot check the auxiliary heater hoses temperature. If is OK inspect the air temperature door, open and close when you change the temperature
If not move out the actuator and check the door moving fee with hand. If is OK probably the auxiliary inside temperature sensor the problem

drintn · March 2010

I replaced the drivers side actuator under the dash.

pocok · March 2010

this actuator control the air direction. The driver temperature door actuator located right side under the dash behind the center console. You need to check this actuator

drintn · March 2010

thank you, i will look for that one and change it out.

rosco1025 · March 2010

We just bought a 2004 Yukon XL and are having some problems with the with the front heater. the fan will blow if we turn the key to the aux. position but will not blow once you start the engine. The rear heater works fine, and there is a sound coming out of what looks like a little speaker just about my head on the driver side. I have read on this forum that it is a sensor. could fixing the problem with the blower fan be just as simple as replacing the sensor or do I have bigger problems?

thechadly · March 2010

I have an 05 denali that i lost the brake lights and cruise control. The 3rd brak light works but not the taillights. I changed the bulbs and all fuses associated with the cruise and braklights. SO far no luck. someone told me the signal change stem may be the issue. Can anyone help? Thanks

my9ranch · March 2010

Ac blows great just today started only blowing out top vents like it's trying to defrost
all other functions work fine heat / ac. Fan high/low every thing fine except changing were you want air to come out. Any ideas

bandaidgooz · March 2010

This works!!! Thank you for saving me a couple of hundred $$$$$!

brewer005 · May 2010

First time posting....

My rear A/C is working fine, however, my front vents will only blow out cold air if I'm driving down the road/highway. If I come to a stop, the airflow is dead. Not sure if it is my blower, or possibly the blower resistor board (based on my research on these forums).

Any thoughts? Easily fixed, cost, etc...

Thanks.

fouss · May 2010

my truck blows cold air at driver side vent and hot air on pasenger side dash vents.any ideas which actuator it might be?

sacerio · May 2010

ac is turned on but no cold air. comp. is on but nothing. hot air works. evaporator is cold.I think its the actuator but dont know what it looks like or were its located.2004 yukon xl.

bmkbmk26 · May 2010

I have a 2005 Yukon SLT and the fan will not shut off until at least 1-2 hours after we shut the car off. It is draining the battery consistently.
Any ideas would be helpful.
Thank you

gmcustsvc · May 2010

Hello Bmkbmk26,
I am from GM Customer Service. I apologize that you have had an issue with your vehicle. Can you please email me more information about your concern so I can look into your situation further? You can find my email by clicking on my name. Thank you,
Mariah GM Customer Service

pipespinner · May 2010

i have been looking over these posts to help answer my problem. on my 2005 Denali the air conditioner vents will not blow to the passengers. they split between the defrost and the floor. the fans and the temps works fine. the problem seems to be with the vent doors are not changing. i have read to pull the fuse and also disconnect the battery. are these the correct recommendations for my problem? i hope someone can help with this problem

thank you,

todd_walter · May 2010

I have an '04 with this dual-zone problem and the procedure was to pull the fuse(s) (they are at two locations, the drivers door fuse panel and the panel on the transmission hump, I yanked them both to be sure.) I then keyed to the "run" position (did not start) and then keyed off. Replacing the fuses I started up the truck and the PLC cycled the actuators to find their limits. Happens at least once a year! :mad:

msliman · June 2010

I am experiencing a parasitis loss. I checked it with my multimeter and It was either 7.0 amps. or 0.7 amps, not sure because i blew the fuse in my meter when I was checkign somethign else. When parked overnight the battery dies. I replaced the battery, and checked the alrernator (ok). After re-connecting the battery the front A/C did not work, and would only blow heat. The rear A/C works fine all along. Then I parked it for a few minuites. I started it back up and now the driver A/C is full cold, but the passenger side is Full Heat. Somethign is hanging open when I turn it off and draining my battery. I suspect the dual climate control module, or a door actuator. Has anyone else experienced this? How can I be sure what it is? Help.

loretta7 · June 2010

This happened with my 2003 Yukon XL. I took it to an A/C mechanic and would you believe it was simply 2 O rings that needed to be replaced ! Both were where the compresser and the freon pipe connect. I took him less than 20 min to replace each one and add back the freon that had leaked out bc of the worn O rings. I think one was where he connected to add freon and the other was at the switch connection to the compresser. If that's not it, it could be a bad switch. I found out that it regulates the compresser and if it gets stuck on "off", the compresser won't kick back on. Replacing that costs around $50. Good luck

loretta7 · June 2010

A/C condensation is not draining to the outside. Instead the rear carpet gets soaked. I was told the drains are clogged. How do I access them and unclog them?

msliman · June 2010

What you are saying makes sense, but the A/C was working on one side, and not on the other. This also does not answer the question of my battery draining overnight. I took it in to a reputable ASE shop and of course it is working perfectly. The battery is not losing any juice overnight now. He did offer that he has seen this before, and the problem will no doubt resurface. When it does I should take it back in while it is still acting up.

Thanks for the comments

svigil · June 2010

I have a problem with my 2004 Yukon XL Denali  The Drivers side AC will blow hot air while the others are blowing cold. I was told it is the Actuator however there are 3 (Air Inlet, Mode, and Temperature) will this fix the problem or is it something different?

alabamayukon · June 2010

2004 GMC Yukon - I realize that the speedometer cluster was recalled which I didn't find out about until I had passed the 80,000 mile mark. That I can bear. Recently the seat heater control on the driver's side has started cycling (making a clicking noise near the dash fuse box) from high to medium to low and continues to do this for several minutes. Next came the traction control sensor indicator in the menu telling me that (although I hadn't touched it) it had been turned off. Saturday, I got into my truck and the battery was dead. Jump started it and it was dead again the next morning. Jumped it again and the air conditioning control panel was completely dead - and... in this Alabama 100 degree weather, heated air is blowing out of the vents. With no way to control it or turn it off... I am in misery. Any suggestions would greatly be appreciated.

alabamayukon · June 2010

Ok guys... this chick just disconnected the negative battery cable and then reconnected it. The air conditioner digital panel is now working, but the air is only blowing through the defrost...but it's COLD!!! Thank goodness! Not sure how to fix this now that it's locked in one position... any comments?

msann5533 · June 2010

rear air no blowing 2003 yukon xl
I am having a problem with my rear a/c in a 2003 yukon xl. NO air is blowing out of it, hot nor cold. The front air blows fine.

Does anyone have a suggestion? thanks

bulldog26 · June 2010

GMC Yukon front air conditioning works great but it has no air coming out of the rear vents at all. any help appreciated.

gmcustsvc · June 2010

Hello Bulldog26,
Have you had anyone diagnose the problem with your vehicle? How long has the concern been present? Thank you,
Mariah GM Customer Service

bcrawfo2 · June 2010

My 2004 Yukon Denali has almost always had the hot on passenger side...cool on driver's side. I took it in and they "reprogrammed" it back in 2006. The problem still occurred. Figured they'd keep reprogramming every time, so I just lived with it.
I could either just restart the car or turn the heat all the way up...then back down.
I recently started reading about this problem and did the relearn (pull the fuse under the hood) and now I have hot air coming out of the defrost all the time. I've tried relearning a few times (by the way).
Where do I go from here? I wouldn't think all my actuators went bad. Does that mean it's one of the control modules?
I've put a call into the dealer and explained my case. I stated that I know I'm out of warranty, but it's a well known problem that I did report. I mostly don't want to pay for them to guess at things. Willing to pay to get it fixed...only if they fix it...and just what's wrong.

Thanks for any thoughts.
Scott

gingerb048 · July 2010

AC/Heater control position has no effect. Constant defrost. Thank goodness the AC works in defrost at least. Is it a vacume line or faulty switch? Thanks for the help!!!

bcrawfo2 · July 2010

After a long weekend and a 6 hour car ride the AC switch to blowing out the dash vents again.
I'm still amazed that GM won't admit something is wrong here.

ilmk123 · July 2010

The one you are looking for is under the dash ,right behind the consol and the start of the hump. You will need a 6mm or 7 mm. The mode actuator is located on the drivers side right above the gas pedal. Check out this link and it will help you. I have mine torn apart right now for the 3rd one........Scott
http://www.tahoeyukonforum.com/forum/showthread.php?t=15787&highlight=Blend+Door- +Actuator

bcrawfo2 · July 2010

Thanks for the pictures. I wanted to try this but read a lot of the forums talking about taking the whole dash apart. I messed with this part one day investigating and couldn't get to that back screw out. I didn't try TOO hard.
Strange question...
Can I remove the actuator and move the door by hand....drive for a few days (knowing that side will be stuck on cold) then wait for the replacement part?

ilmk123 · July 2010

Yes that screw is a PITA. and yes you can. But at highway speeds tha door can change directions and start blowing hot air. I learned that one that hard way tonight. I heard if you get these at the dealer they are costly. You can get them on e-bay or parts store. Search that thread on how to calibrate them. You can e-mail me at ilmk123@mchsi.com.....Scott

tidester · July 2010

You can e-mail me ...

Let's keep the discussion here so everyone can benefit. We ask that people not post email addresses in messages posted to our Forums. Thanks!

tidester, host
SUVs and Smart Shopper

bcrawfo2 · July 2010

Thanks everyone....
Wow...that was a PITA.
Even getting the hush panel off was tough. That screw nearest the actuator...man. Who builds these things?
The screws on the actuators seem to be 5.5mm, not 6. I was killing myself on the back with a 6mm. My socket set doesn't have a 5.5, but luckily a 7/32 if memory is right worked.

I have my actuator out (52402588). Does anyone have a favorite cheap place to order, the right part?
I saw another post (dang if I can't find the link) that said some of the replacement parts were mis-labelled and were for the wrong side. This would allow the door to swing once and then get stuck.

Scott

bcrawfo2 · July 2010

Passenger side...I want this
http://www.amazon.com/Dorman-Solutions-Door-Actuator-604-100/dp/B000IZ4OX6 (it says Aux)
not
http://www.amazon.com/Dorman-604-106-Air-Door-Actuator/dp/B001C6Q7US (it says upper)

Right???

GMC Yukon AC and Heat Questions

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