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04 GMC - HEAT OUT AC VENT
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dcraiga
New User
Apr 30, 2013, 2:18 PM
Post #1 of 6
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04 GMC - HEAT OUT AC VENT
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I have a 2004 GMC Sierra 1500. The heat and air both work fine and the controls for heat and air work as designed, BUT, every once in a while, the drivers side vents will go to full heat without my changing settings on the controls. Once it goes to full heat, I can still change vent positions, floor, defrost, etc. but, cannot control the heat setting, it stays hot, UNTIL, I stop and turn the truck off and restart the engine. Then the air coming out on the drivers side will go back to the control setting. This usually only happens once and usually soon after I first start the truck and I am driving. After stopping and restarting the engine, it usually will not repeat on this run. Some have said blend door controls, but, the controls work well when it is not in this undesired heat mode. Anyone else had this and been able to correct the condition?
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Apr 30, 2013, 2:45 PM
Post #2 of 6
(11612 views)
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Re: 04 GMC - HEAT OUT AC VENT
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Just so I/we know this is a regular pick up truck, single A/C system NOT w passenger and driver's side controls? So far if so this is a sign of low charge and perhaps icing of the evaporator. What MIGHT be happening is it ices up just partly so perhaps again as you didn't say the passenger's side gets cool and driver's side shouldn't be real heat just ambient air plus some as there is some heat from engine that does still up the vent temps on plain vent vs what it really is outside.
For this you take pressure first IMO and if off of norms find the leak which does account for the lion's share of A/C problems.
Icing seems strange I know but it can as it evaporates liquid refrigerant in the wrong spots and can be a problem to compressor on many if low it doesn't get the oil to lube the compressor well. Near sure this is a CCOT (clutch cycling orifice tube) set up for a pick up.
#1 is not to just add anything until things are known. Seek help as wrong moves a VERY costly!
T
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Hammer Time
Ultimate Carjunky
/ Moderator
Apr 30, 2013, 3:13 PM
Post #3 of 6
(11590 views)
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Re: 04 GMC - HEAT OUT AC VENT
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Does it have independent left and right temp controls?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Discretesignals
Ultimate Carjunky
/ Moderator
May 1, 2013, 4:33 AM
Post #4 of 6
(11565 views)
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Re: 04 GMC - HEAT OUT AC VENT
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#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.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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dcraiga
New User
May 1, 2013, 4:07 PM
Post #5 of 6
(11552 views)
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Re: 04 GMC - HEAT OUT AC VENT
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This is a regular cab GMC pickup. My controls do have separate driver and passenger side temperature settings. When I stop my vehicle, turn it off and restart the vehicle, the A/C immediately returns to normal and provides cool air to the driver side vents. The driver side is the only side experiencing this condition. It is full heat, when this does happen.
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Discretesignals
Ultimate Carjunky
/ Moderator
May 1, 2013, 4:12 PM
Post #6 of 6
(11546 views)
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Re: 04 GMC - HEAT OUT AC VENT
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Like the PI states, have the HVAC control module scanned for trouble codes and inspect the connectors for terminal tension problems.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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