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Old September 13th, 2011, 07:52 PM   #1
Flexin' XJ
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Default 2003 Sierra HVAC Inop

So my battery died today and I was lucky to make it home. I went and got a new battery, installed it no problem. Started right up.

Went to go get dinner and it was blowing warm air. Looked, temp was set to full cold. It was also blowing out the dash vents when it was set to floor. I changed the temp to full hot, waited and changed it back. Temp didn't change. Tried to engage the A/C and the indicator light would not come on. Will not change mode either.

Did the HVAC control get fried when the battery went out? When I started it leaving work, it cranked very slowly and then started. The dash lights were going out and the radio reset but it started.

Any ideas?
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Old September 14th, 2011, 06:41 AM   #2
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Anything?
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Old September 14th, 2011, 08:15 AM   #3
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1 PIT3504D: Various HVAC Concerns And DTCs - keywords B0229 B0263 B0268 B0408 B0414 B0418 B0424 B3770 blow blower cold hot mode temperature warm - (Apr 2, 2008)


Subject: Various HVAC Concerns And DTCs


Models: 2003-2006 Cadillac Escalade, Escalade ESV, Escalade EXT

2003-2006 Chevrolet Avalanche, Suburban, Tahoe

2003-2007 Chevrolet Silverado Classic

2003-2007 GMC Sierra Classic

2003-2006 GMC Yukon and Yukon Denali Models

2003-2007 Hummer H2




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This PI is being updated to specify location. Please discard PIT3504C.


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The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
Some customers may comment on various HVAC concerns including temperature doors defaulting to full hot position or unable to obtain defrost position. Upon inspection, technicians may find DTCs B0414, B0424, B3770, B0418, B0408, B0263, B0268, and/or B0229 are set.

Recommendation/Instructions:
Check the Right I/P junction block connectors C4, C5, and C8 (Document ID # 1562972) for poor terminal tension, backed out terminals or connectors not fully seated.

2 PIT4427: Repeat HVAC Actuator Replacements - keywords door cool heat mode temperature - (Jun 15, 2007)


Subject: Repeat HVAC Actuator Replacements


Models: 2003-2007 HUMMER H2, SUT

1999-2007 Chevrolet Silverado Classic

1999 -2007 GMC Serria Classic

2002-2006 Cadillac Escalade, ESV, EXT

2000-2006 Chevrolet Avalanche, Suburban, Tahoe

2000-2006 GMC Yukon, Yukon Denali, Yukon XL, Yukon Denali XL

2002-2007 Chevrolet Trailblazer Models

2002-2007 GMC Envoy Models

2004-2007 Buick Rainier

2005-2007 Saab 9-7X

1998-2004 Chevrolet S/T Classic Blazer and S10 Pickup

1998-2004 GMC S/T Classic Jimmy and Sonoma

1998-2007 Oldsmobile Bravada

2003-2006 Chevrolet SSR




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This PI Being Updated To Add Additional Model Years. Please Discard PI02080.


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The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
A replacement HVAC actuators is inoperative or that has worked one time and quit. The HVAC control head learns the stopping points based on how far the HVAC DOOR travels. If the actuator reachs the mechanical stops on the back of the actuator it will be outside of the range that the HVAC control head can learn. If the actuator was not mounted to the HVAC case prior to plugging in its connector, the actuator will go out of range and be inoperative.

Recommendation/Instructions:
Always attach the HVAC actuator to the case before installing the electrical connector.

If an actuator is out of range it may be possible to bring it back into range by following the procedure below:

•Turn ON the ignition, with the engine OFF.
•Connect a 3 amp fused jumper wire between the actuator control circuit and the 5 volt reference circuit of the actuator connector.
•Remove the jumper wire and actuator connector when the actuator is at the center position.
•If the actuator doesn't move in step 2. Try installing the jumper wire from control circuit and the ground circuit of the actuator.
•With the actuator in the center position, install the actuator to the hvac case and secure the mounting screws and then connect the actuator connector.
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Old September 14th, 2011, 08:26 AM   #4
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I've had luck "re-learning" them by running the blend door through it's full temp. range slowly a few times with the key on.
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Old September 14th, 2011, 11:52 AM   #5
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find someone with a scanner and do a complete relearn on air doors, temp doors, if this doesn't fix it.... $$$ to repair and tons of work
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Old September 14th, 2011, 12:04 PM   #6
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Have you tried checking all the fuses, the underhood & dash fuse panel
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Old September 14th, 2011, 12:07 PM   #7
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theres a fuse under the hood you pull to reset the hvac.Usually clears it up.But cant remember wich fuse if i get time later today ill look it up.
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Old September 14th, 2011, 08:20 PM   #8
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I searched the interwebz yesterday and found a couple things. Nothing fixed it.

Quote:
Originally Posted by joescamaro67 View Post
theres a fuse under the hood you pull to reset the hvac.Usually clears it up.But cant remember wich fuse if i get time later today ill look it up.
This fixed it somehow. There was a fuse labeled HVAC/?????. Pulled that, it was good. Put it back in and checked operation but still didn't work. Chekced the inside fuse panel. There was a fuse there labeled HVAC. Pulled that, also good. Checked operation and still inop.

Pulled both fuses and noticed the controls still lit up and the blower still worked. Pulled the blower fuse just because. Replaced all the fuses, checked operation again and this time it was working. Must have just needed to keep the fuse out for a certain amount of time for it to reset.

Thanks to everybody.
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Old September 14th, 2011, 08:36 PM   #9
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Yup thats the one
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Old September 16th, 2011, 05:37 AM   #10
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I've had this happen on my 2500HD after disconnecting the battery. It happens every time I disconnect the battery. It usually clears itself in a couple minutes.
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Old September 16th, 2011, 06:28 AM   #11
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Quote:
Originally Posted by Bow_Extreme View Post
I've had this happen on my 2500HD after disconnecting the battery. It happens every time I disconnect the battery. It usually clears itself in a couple minutes.
Hmm. When I worked at the Chevy dealer I had never had this issue with a vehicle. I also have never had to disconnect my battery before so this is all a new thing for me. It lasted a day or so.
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