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Old January 1st, 2007, 06:07 PM   #1
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Default Chevy techs heat A/C questions on a 1994 suburban

I have this problem that has been going on for quite a while and seems to be getting worse. The Hot/Cold adjustment is intermittently sticking on full hot or cold. If you move the heat adjustment back and forth, eventually it will change. I also think I heard like a flap inside the dash, flop/thump/clunk when turning on the system. It has the electric buttons for the controls, no levers.

I also noticed someting new in the last few weeks. The Modes seem to be slow to change, or not fully change. example, its on full defrost, but air is coming out the dash vents.

So what should I be looking for? I think it is an all electric system(no vacuum) correct?? It seems like the actuator for the hot cold is stripped out, catching once in a while.

Thanks in advance,
Fred
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Old January 1st, 2007, 06:09 PM   #2
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blend door motor, just a guess
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Old January 1st, 2007, 06:24 PM   #3
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the doors seem to get stuck more readly when older. the one thing that can contribute is mold in the A/C condensor. it acts like glue when laying on the seals and things. if you can get it operate freely try spraying some Lysol or other antibactieral spray into the intake duct out under the edge of the hood. it may pull enough into the duct while running to help free the doors. under dealership conditions we would pull the entire duct work and clean. then reinstall at what ever cost it incures.
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Old January 1st, 2007, 06:39 PM   #4
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Thanks Yetti. To pull the duct work would that involve removing the dash, discharge a/c, and remove HVAC box? I'm not familliar with the Chevy stuff. I've only changed blower motors on them.
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Old January 1st, 2007, 06:53 PM   #5
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some of the stuff you can get to easy. the quickest way into most systems is through the blower opening. if you can open up the system that way you may be able to use a small mirror to see whats jamming your system. I have found everything from pills to pencils stuffed in the duct work. my old dodge has mice living in the ducts and I just open the duct up and shove in the shop vac to clean them out.
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Old January 1st, 2007, 07:10 PM   #6
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I was trying to remember more ways into that system. if you pull out the glove box tray you can get at the upper duct where it blows at the glass if I remember right. its like 1 or 2 screws and you can lift it up enough to see if anything is stuck down in it. just becarful not to break anything. with the glove box out you should beable to see your mode door accuators move also.
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Old January 2nd, 2007, 06:14 PM   #7
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after thinking more about this today I remembered that most of the panels in the dash "snap" in place and can be removed with a couple screws here and there. one of the other ways into the dash was by removing the radios divorced cassette deck in the center of the dash. the duct work from the blower goes right behind it.
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