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If the the sales sticker on our trucks said "If you ever have to disconnect the battery, you will need to re-calibrate your climate control. If you fail to do that, you will likely cause permanent damage to a device deep behind the dash.", none of us would've bought these vehicles.
But...strangely...that's the symptom we all have.
OK....rant off.
Supposedly when the AC system loses power (battery change)....the actuators that control air flow thru the AC system need to re-calibrate themselves. They do this by "hunting" the range of their movement. Move to one extreme until they can't any further....remember this position. Then move to the other extreme and repeat the process. I think sometimes that happens ok, but if for some reason it doesn't...the system will remember a bad limit and keep trying to have the actuator reach that unattainable position. Do that for a long period of time, you do permanent damage to that actuator. Now....when that actuator needs to be replaced, you have a $400-$500 service bill which involves removing the whole dash.
There are procedures involving pulling the fuses or discharging the computer and then re-applying power and letting the AC system figure it out...I just don't get why that doesn't work right in the first place.
I have been reading e-mails, but not seeing my issue as bad as mine.
It started in the winter 2 years ago, on & off all season & now for the last year it is continually blowing out wrong air. I would turn on the heat, and it would blow hot air for like 30 seconds, then it would turn to ICE COLD air coming out, then the summer after that( last summer) when i turn on the a/c it blows out HOT HOT air( could burn my hand if i kept it up to the vent). now like i said, when it first started, it was on & off, but now for the last yr it hasnt stopped 1 time! also, in the summer because it sooooo hot outside, i have to put the vents on defrost so the hot air will blow out up there & not on me, but even with the whole system off, it is still blowing HOT HOT air on me. I have to keep my ALL my front vents closed & it still blows it on my feet continually while i am driving.
any input would be great!
You might want to replace the AC fuse and see if that helps. My fuses were all fine but, I took them out and put them back in and the problem went away, so far. Someone commented here and said that sometimes you have to reset the heating and cooling system by replacing or just unplugging and re-inserting the fuses. Anyway, it seemed to work in my case. I had also unhooked and re connected my battery, since replacing the old battery seemed to trigger the problem in the first place. Best of luck to you. That's an unbearable problem to have.
Let me know how you come out.
I've concluded this loyal GMC / CHEV owner for 40 yrs is going to start a new loyality to FORD.
Hundreds of questions yet not a single solution....My misery started with a dead battery. Charged it up and yes hot air only on drivers side when A/C is on, pass. cold.
2005 Avalanche, 21,000 miles like new but only able to drive in northern ALASKA where the heat is on 24/7 365 days a year...who needs A/C up there... :mad:
Temp. set at 60 degrees yet hot air...
I would think after disconnecting battery, I'd have to re-program my power set settings.
Power settings were still remembered by computer so I guess I'll try the local dealer see if they can flash the unit back to factory settings? This all started by a dead battery...nuts
Try disconnecting battery 10 minutes, remove HAVC A/C Heater Fuses.
From what I've read, disconnecting power causes the computer to default back to factory setting.
Its worked for many but not me.....my avalanche is off to dealership tomorrow unfortunately $$$$$$$ :lemon:
Good luck...
Try:
Start vehicle
Immediately turn A/C off but climate system on.
Turn vehicle OFF.
Disconnect ( - ) negative battery cable
Disconnect HVAC ( 10 amp fuse ) and both A/C fuses if youy have 2
Wait 10 minutes.
Start for minute, turn vehicle OFF.
Install HVAC fuse only
Start and run climate control settings taking time to listen for defrost, vent, floor cycles to work properly. See if heat is still coming out on low temp setting.
If no heat, push recycle button you use when A/C is on sucking only cabin air...
No heat hopefully...
I spent about 5-8 minutes driving around the block doing this.
Not sure if the vehicle needs to be out of park or driving to make this way work??
( I guess with parking brake on, in neutral might work also )
What I've read, you need to re-calibrate the climate system with A/C off. Making sure all the settings are functional.
Turn vehicle OFF
Install A/C fuses.
Start car A/C OFF......
Keep A/C off
Run climate settings again on cold detecting any heat ??
Hopefully not...
Push A/C button ON
Hopefully this will solve your problem.
After 2 days of reading comments, this combination worked for me.
This should be a recall issue...
Good luck
I hate the fact that the Government owns 'GM' and all of the crap that goes along with it. They should have just been allowed to fail, filed for bankruptcy, restructured and stayed out of this Government's debt. My last two GM trucks had over 230K miles on them and never had a major problem until they had over 150K miles on them. Then it was a Transmission both times.
I won't be leaving GM until they pry the keys of my bloody, lifeless hand. I say, reconnect your battery a couple of times if necessary and be glad the biggest problem you have is a Heat issue. Think of our less fortunate Brothers and Sisters, in their Fords and Dodges, sitting on the side of the road in 115 degree heat and no way to drive out of it.
Disconnecting the battery cables does not fix the problem.
Myself, I'll be buying FORD 350 next...I called GM, they never returned my call....
I'd call Obama but he is always on vacation....
Mybe if I drove it to Arizona border, left keys in it, illegals could drive in style..
just a thought
I am lead to believe that since your vehicle has dual climate controls, you MUST have TWO mixer doors, one for the drivers side and one for the passenger side. It seems to me that the mixer door for the driver's side needs to be be replaced........I hope this works.
Keep kool.....
Bill from NJ
Replacing mixer doors at a cost of $1,400 would not solve the problem.
Owners need to re-program the climate control system which I did successfully.
Disconnect A/C & HVAC fuses.
Start and run for about 30 seconds, turn off.
Install HVAC Fuse only. ( A/C fuses leave disconnected )
Start and while driving turn on climate cold setting and run through the different controls, foot, vent, defrost etc. making sure the system is working properly several times.
Turn vehicle off...
Start and re-do sequence several times.
Turn vehicle off.
Install A/C Fuse
Start while driving turn climate control on with A/C...
These steps resolved the problem, re-calibrating climate control systems memory.
Again, this should be a recall issue and thousands of loyal GMC customers are being charged $1,400 or more from dealers.
thanks
Thanks to all,
Dan
read a few posts back the steps I wrote to clear control system.
if that does not work, you might have a faulty HVAC door that needs replaced.
if you can't find my post few days back, I'll list them again.
GMC misery :mad:
Hope that helps! It worked for me but, not for others. But, it's all I got.
Best regards.
For a few owners, disconnecting battery for 30 min. reconnect resolved the issue. The majority of us, it doesn't.
Further discussion with a GM mechanic, climate control system needs to be reprogrammed. Read back a few posts you'll see what worked for many of us that I posted.
Disconnecting the battery, computer climate control still keeps memory.
If you have power seats memory button for driver 1 & 2, you'll find seat memory is not lost when battery disconnected, same issue with climate control.
This should be a recall issue.
Entire dash needs to be removed.
I'd sell the rig...
I have a 95 yukon with the same issue. Did you ever figure out a fix?
It worked for me and several others, simply disconnecting battery for 30 minutes did for others.
If your issue started after a dead battery, you need to re-calibate climate control systems memory.
If issue just happen suddenly without battery problems, it more than likely the electronic door inside vent needs replaced. $$$$$
I forget what that part is called.
Did you fix it yourself? I've read the entire dash needs to be removed.. :mad:
Go back few postings and see if it helps you.
Harley
Owners need to re-program the climate control system which I did successfully.
Disconnect A/C & HVAC fuses.
Start and run for about 30 seconds, turn off.
Install HVAC Fuse only. ( A/C fuses leave disconnected )
Start and while driving turn on climate cold setting and run through the different controls, foot, vent, defrost etc. making sure the system is working properly several times.
Turn vehicle off...
Start and re-do sequence several times.
Turn vehicle off.
Install A/C Fuse
Start while driving turn climate control on with A/C...
These steps resolved the problem, re-calibrating climate control systems memory.
Again, this should be a recall issue and thousands of loyal GMC customers are being charged $1,400 or more from dealers.
Thanks Again
I also know little about working on new cars but refused to pay $1400 to dealership knowing this issue started because of a dead battery. Dealership knows hundreds of thousands of customers are dealing with this issue and you'd think they suggest the steps to correct I listed FIRST...no, they want $1400 for doing nothing.