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Cold feet I have a 2002 GMC Sierra SLE pickup. The floor vents have stopped opening up so there is no air going to the floor. I had a 1999 Chevy pickup that did the same thing. With both trucks the a/c indicator light went out then the recirculate air light went out. After these things happened, the floor vents stopped working when the knob was turned. With this happening, do you think it is the whole climate control assembly or a motor to the floor vent has gone out. With both trucks having the same symptoms, I am leaning toward the control. Please help before I have to spend a lot of cash eliminating faults.
What would the chances be that the same sequence of events happened on two different vehicles. I looked the best that I could under there and didn't see anything out of the ordinary.
What would the chances be that the same sequence of events happened on two different vehicles. I looked the best that I could under there and didn't see anything out of the ordinary.
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Make sure no one has kicked the vacuum hoses off on the passenger side under the dash . look under there and see if all hoses are still connected properly ..
if there is no apparent vacuum lines off under dash on passenger side then I recommend get on ebay to buy your control. I buy there instead of through GM its usually alot cheaper for sure. thanks if there is no apparent vacuum lines off under dash on passenger side then I recommend get on ebay to buy your control. I buy there instead of through GM its usually alot cheaper for sure. thanks
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Some of these pickups would develop an air leak between the air inlet section of the HVAC box and the cowl or firewall area. This leak would allow cold air to seep into the cab [usually by the passengers feet] in the winter and hot air in the summer. The other rarer cause I've seen is the recirculation door actuator motor sometimes won't hold the recirculation door closed which can also cause a leak. Sorry but I don't have a procedure to fix either of these for you as the ones I saw were still under warranty and went back to the dealers. Hope this helps narrow it down and good luck!
either a vacumn pipe is broken or the ends split so its not passing a vacumn to open the flaps,where they are and how to get to them i cant help because i have never worked on one as they are not here in spain.check the engine end first though .Look for some small rubber pipes running from the inlet manifold
Here is a TSB (Technical Service Bulletin) for your vehicle for loss of temp control. File In Section: 01 - HVAC Bulletin No.: 01-01-39-007 TECHNICAL Subject: Loss Of HVAC System Mode and/or Temperature Control
(Reroute Wiring Harness)
Models
1999-2002 Chevrolet and GMC C/K Pickup Models (Silverado and Sierra) 1999-2002 Chevrolet and GMC C/K Utility Models (Avalanche, Suburban, Tahoe, Yukon, Yukon XL, Denali) 2001 GMC Sierra C3
2002 GMC Sierra Denali
2002 Cadillac Escalade, Escalade EXT
Some customers may comment that they cannot control the HVAC system modes and/or the temperature. These concerns may be intermittent.
Cause
There may be poor terminal contact and/or bent terminals in connectors C206 (RPO C68 automatic HVAC controls) or C296 (RPO C60 manual HVAC controls). Excessive tension on the wires due to the wiring harness being miss routed in the instrument panel carrier may cause these conditions.
If the warranty campaign is over i am sure they can or may have in the system on how to correct the problem.
Good luck and hope this helps, keep me posted if you need help on to the repair procedure.
none of the above, the vent door is stuck inthe open position most probable cause is vacum leak look closer to your fire wall and you will see a very thin vacum hose going into the vehice which seems to be unpluged!!
What would the chances be that the same sequence of events happened on two different vehicles. I looked the best that I could under there and didn't see anything out of the ordinary.
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