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04 gmc sierra 1500 climate control panel
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Alfonz
New User
May 23, 2010, 5:39 PM
Post #1 of 5
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04 gmc sierra 1500 climate control panel
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2004 GMC Sierra 1500 Z71
engine is a 5.3 w/71k miles
I have recently experenced a problem with the climate control panel position selector control. No matter where I set the selector the air only comes from the windshield defroster vents. This holds true in both the heat or A/C modes. Has anyone experenced this, if what do I do?
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Hammer Time
Ultimate Carjunky
/ Moderator
May 23, 2010, 6:01 PM
Post #2 of 5
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Re: 04 gmc sierra 1500 climate control panel
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The mode selection is done through a series of air doors that are operated by vacuum. When there is either a partial or total loss of vacuum, the system will default to either defrost or on some vehicles, heat. Acceleration can also have an effect on the doors for the same reason.
Look under the hood for a small black plastic hose coming through the firewall. Follow it to the vacuum source looking for any breaks, cracks or leaks. Also follow any other lines that branch off because they may go to a vacuum reservoir (storage tank) and a leak there will cause the same problem. Using a vacuum gauge to determine if you have full vacuum at any given point is the best way to find it. You can cut into the line anywhere and splice it back together with a piece of vacuum hose. Find the broken line, you found your problem.
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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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Hammer Time
Ultimate Carjunky
/ Moderator
May 24, 2010, 2:26 AM
Post #3 of 5
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Re: 04 gmc sierra 1500 climate control panel
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It has been brought to my attention that this vehicle uses an electric actuator rather than the vacuum type. The mechanism can jam or break while performing a self test which occurs after the battery has been disconnected.
Here's what the actuator looks like
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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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89formularoth
New User
Jul 9, 2010, 6:53 PM
Post #4 of 5
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Re: 04 gmc sierra 1500 climate control panel
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Do you know the part number for the electric actuator by any chance?
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 9, 2010, 6:55 PM
Post #5 of 5
(6213 views)
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Re: 04 gmc sierra 1500 climate control panel
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No, but I'm sure the parts department can tell you in an instant
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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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