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big ig

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big ig Enthusiast

big ig

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I have a 04 Yukon with dual climate control and I am having problems with it blowing hot air out of the passenger vents. I've read about recalibrating the air blend actuators using the fuse out- key on and cycling the driver door. I have performed this procedure many times and it has worked for a little while then back to the hot air. I have replaced the lower blend door actuator and now I think I need to replace the upper. Does anyone have a procedure on how to get to the actuator and replace it?

Chris Senior Enthusiast

Chris

Posted
Posted

step one take truck to dealer. step 2 hand keys over. step 3 lower pants and bend over counter. it pretty much involves removing the dash. so your gonna pay a lot

big ig Enthusiast

big ig

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step one take truck to dealer. step 2 hand keys over. step 3 lower pants and bend over counter. it pretty much involves removing the dash. so your gonna pay a lot

 

Dang, not the answer i was hoping for. I can fix it, my dad has awesome set of tools. haha

jrrod2004 Senior Enthusiast

jrrod2004

Posted
Posted
step one take truck to dealer. step 2 hand keys over. step 3 lower pants and bend over counter. it pretty much involves removing the dash. so your gonna pay a lot

 

Dang, not the answer i was hoping for. I can fix it, my dad has awesome set of tools. haha

 

 

 

 

email? have some pdf files that can help out but it is definitely a day or day and a half job....

2016 Sierra Owner Senior Enthusiast

2016 Sierra Owner

Posted
Posted

Yeah after looking at that 2nd page. I hope your dads awesome set of tools includeds a majic wand. LOL Believe me I am not looking foward to the day mine decide to go out. Seems kind of an issue with the auto HVAC system.

big ig Enthusiast

big ig

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I had this issue once, so far it has not come back yet....I think i just the battery terminal off for a 1/2 hour...

 

 

I'll have to give the battery terminal thing again. This is weird problem because it is so intermittent. It doesn't seem like a mechanical failure,it seems more like a computer/controller problem.

Anyway, I called the dealership today to get a price on replacing the upper air blend door actuator. They said the book time is 3.5 hours at $85/hr and the part was close to $300. $600 total for the repair. WOW is all I could say to the guy. I tried to quiz him a little bit but he was pretty tight lipped. I guess giving out service information is not something they like to do, can't blame him I guess.

berteras Enthusiast

berteras

Posted
Posted

I bought a brand new Sierra last year and everything I drove it over 1.5 -2 hours this would happen (which was 3 times) including 2 times in one week. When it would do this, my floor board would get soaking wet. To make a long story short, the truck is now gone. Every time it went out I took it to the dealership and had it fixed, it was under warranty so I have no idea what it cost to fix but all I can say is good luck.

  • 8 months later...
offermnn New Member

offermnn

Posted
Posted
I have a 04 Yukon with dual climate control and I am having problems with it blowing hot air out of the passenger vents. I've read about recalibrating the air blend actuators using the fuse out- key on and cycling the driver door. I have performed this procedure many times and it has worked for a little while then back to the hot air. I have replaced the lower blend door actuator and now I think I need to replace the upper. Does anyone have a procedure on how to get to the actuator and replace it?

 

 

Just got done fixing the similar problem couple days ago on my wife's 04 yukon xl. Posting this in case somebody else runs into the same problem. Had an error code for 02 sensor, fixed the problem, disconnected the battery to clear the CEL/MIL, had it off 15 min, came back out started it up, o2 sensor code cleared, took it for a drive, and only had air coming out the defrost vents, no matter which HVAC function chosen, all air come out defrost vents. Friend of a friend has a friend who works for GM, and indicated this was a common problem for both sierras/yukons, etc after disconnecting the battery and it loses the memory/setting, whether hot air comes through the dash or the defrost, or only through the defrost. It has to reprogram itself, and if the problem isn't fixed soon, the actuator, over time, will go bad.

 

Fix: Turn the ignition to run (without starting the vehicle), then cycle from on to off 3x, then pull the HVAC fuse. Mine was listed as "HVAC 1", located at driver's side dash, by the door, though the guy originally indicated it was HVAC 2 or HVAC B. After pulling the fuse, wait at least 60 sec, cycle from on to off 3 more times, then reinsert the fuse. Leave the ignition in on, and wait about 5 min. After about 3 min, the air switched from defrost to the dash, then turn the key to off (Do not start it). I did not turn the key off (as that wasn't part of the fix originally), but rather started it up, and air switched from the dash to defrost again. Drove it around thinking that it was still recalibrating/programming itself. Later in the evening, turned it to run, air came out dash, and all functions/selections worked, floor, dash, defrost, started it up, and again air switched from dash to defrost, then to dash, then to defrost over ~45 sec. Shut it down, waited a minute, turned to run, confirmed all modes worked, turned ignition off, waited a minute, started back up, everything works as it should now. Been running fine for the last two days. Only thing i can think of for the delay, is that i didn't turn the car off before starting it up the first two times.

hope the info helps someone down the road.

Think i'll buy something to hold the memory while taking the battery off, to avoid this crap in the future...don't mind reprogramming radio stations, but this kind of stuff is irritating.

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