Question about 1999 Chevrolet Silverado 1500

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1996 GMC pickup the defroster will not switch from floor position to defroster at the dash and the air condition will not work at all

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Some of the older one ran off vacum need to check that or maybe the heater door at the bottom

Posted on Oct 01, 2009

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I have a 06 Jeep Commander and the blower is working and blowing heat it will not switch to defrost, floor, front, on the switch?


Sounds like a vacume leak Probably need to pull trim on dash and listen for a rush of air but first listen under hood

Apr 18, 2013 | 2006 Jeep Commander

1 Answer

The blower on my a/c on 2002 chevy trailblazer only blows from the floor vents and the defroster vents but not the dashboard vents how can this be fixed. Also, it only works on 5


It sounds like you have two problems. First a question though; Is your heating and air conditioning control on the dash automatic (has two knobs that rotate and a display screen in the middle), or manual (has two levers that move up and down for driver/passenger temp and a separate fan knob and mode knob).

In response to the vents being stuck on defrost and floor, from experience i can say that the most likely cause is the mode actuator has failed. If your battery has recently gone dead, that could have brought the problem to the surface. When the battery has gone dead, the heating and air conditioning controls relearn all the positions of the actuators behind the dash when the vehicle has been re-started. If there is a position sensor failing (which happens quite often) in one of the actuators, the heating and air conditioning controls won't be able to learn the correct position of the actuator and (in your case) defaults to the defrost/floor position.

The only way to fix that would be to replace the actuator. I would like to know what type of heating and air conditioning controls you have (manual or automatic) before i say anything on the blower only working on 5.

Aug 05, 2011 | 2002 Chevrolet TrailBlazer

1 Answer

2001 gmc sierra pickup - heater will not change from defrost position will not devert air to floor or dash


make sure the vacuum supply that comes from the engine through the firewall by the evaporator has vacuum and is not broken or leaking vaccum

Dec 14, 2010 | 2001 GMC Sierra Crew Cab

1 Answer

A/C not blowing thru vents just defroster and floor


It is a vent door actuator motor on top of the blower box,the dash has to be removed and set in the seats to replace the actuator motor.Cost for the part is about 50.00 dollars

May 23, 2010 | 2002 GMC Yukon XL

2 Answers

1996 chevy blazer my air on heater will not blow


the idea of the switch is run on vacuum and is not making contact with the switch it self either worn contacts in the switch itself **** as an obstruction as well or the vent door is stuck in just that position either behind the glove box or the ash tray are the vacuum lines one of them may be pinched off or the door needs a bit of help until you can free it up

Sep 08, 2009 | 1996 Chevrolet Blazer

1 Answer

No air flow out of face vents.


no, should be a acuator motor that does that

Jun 29, 2009 | 1996 GMC Sonoma

1 Answer

A/c flow


A: Cable has come off door on defroster.

B: Fuse is blown on that part of wiring. May or may not be listed under A/C; could also be under heater.

C: I believe 96 models still had some inline fuses in the wires. Wouldn't hurt to check.

May 24, 2009 | 1996 GMC Jimmy

1 Answer

2000 gmc 2500 pickup heater fan works good but not a lot of air


http://www.fixya.com/cars/t1386554-91_ford Please read this post, I hope it will help you.

Dec 22, 2008 | 1998 GMC Sierra

4 Answers

Vacuum leak


i would say its in the dash unfortunately you will have to pull it out to inspect.

May 25, 2008 | 1996 Chevrolet Blazer

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