Question about 2002 GMC Sierra 2500HD

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Cannot getr air to come throw the dash vents

Every thing works but dash vents, floor defroster

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  • GMC Master
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Usually a faulty blend door under the dash. The blend doors direct air thru the heater core and the vents.

Posted on Jan 12, 2013

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

dgjtex
  • 405 Answers

SOURCE: 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.

Posted on Dec 22, 2008

  • 46 Answers

SOURCE: defrost vent door wont open

sounds like you have a vaccum leak or a blockage in the blend door area of the HVAC system most of the doors are controlled by vacuum if not by vacuum on of the servo motors that control the blend door is not functuning properly. Hopr this is helpfull

Posted on Jan 17, 2009

  • 13 Answers

SOURCE: 97 Sierra no heat on passanger defrost or floor

I assume you have the dual climate control feature on your truck. it sounds like you have door problems. The heating system has several doors inside the box and duct work that divert the air from defrost to face and feet...i'm not 100% sure if the ones in your truck are electronic or vaccum, but i think they are electronic. From time to time the actuators that control the door go out, as every electric motor does. You need to find the ones that have quit and replace them. It is possible that the arm(s) on the actuator(s) have broken loose from the doors and are working but not pushing or pulling the doors properly...if might help to remove the front seats...just to help save your back....working under the dash is hard on your body....and it take a good half day to remove the dash, so working under it is actually less work.

Posted on Mar 13, 2009

  • 5 Answers

SOURCE: dash vents not working

It may be the actuator not working properly. Should be above the accelerator pedal to the right.

Keeme

Posted on May 20, 2009

  • 1 Answer

SOURCE: Dash vents will not blow air. Defroster and floor vents blow fine.

Is it a new vehicle? I had a new vehicle that had the same problem. Answer was that the holes weren't punched out of the vent.

Posted on May 23, 2009

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1 Answer

I have a 1975 k5 blazer and it blows cold air it worked fine last year but now it only blows cold air even on the defrost setting what can the problem be and how can I fix it?


A vent flap actuator probably needs to be replaced. It's what moves your vent flaps from heat to A/C or to plain "vent air" when you change settings.

The discussion in the link includes vent flap actuators. Unfortunately, they also include the infamous no low speed fan problem too.

Cannot get any air from dash vents while defrost and floor vents work fine...

Your particular actuator will be a different one than they found.
They're all a absolute pain to get at because they can be well buried in the dash. I would start looking under the dash on the passenger side, that's where most of the air control is. Cannot get any air from dash vents while defrost and floor vents work fine...

Nov 14, 2016 | Cars & Trucks

1 Answer

Why is hvac air coming from all three locations (vent/floor/defrost) regardless of switch setting?


Check air box if it won't change air flow some thing is wrong there inside the car

Jul 14, 2014 | 2000 Buick Regal LS

1 Answer

How to repair


i'd think that the vent adjuster knob/slider is not working correctly strip out the heater panel around the control knobs and check the vent direction is working properly either stiff operation so a little wd40 on the cable would probably do the trick or some thing causing the vent itself to not move

May 01, 2014 | 2004 Ford Crown Victoria

1 Answer

My ac throws air threw the front vents sometimes


The default position is the defrosters. It takes vac to move the blend doors to the floor and dash vents. You may have a leak somewhere in the system or another blend door that is sticking. Could also be a problem with the selector but I doubt it.

Jun 25, 2012 | 1993 Buick LeSabre

1 Answer

Ac vents not working


There is a blend door acuator which moves when u change your settings. Its a electric motor. Down under dash, Will need a mech and a heating and cooling diagram to find where the motor is,

Jun 13, 2012 | 2007 Ford Sport Trac Limited

1 Answer

1992 chevy g20 van ... AC blows through the lower ducts but not the mail cabin vents. What do I look for to fix this?


Behind the dash, when you throw the lever to change which vents you want air to come through, it can sometimes "slip" over little plastic gears/levers which flip the ductwork to different vents such as floor to the dash vents or defrost. look up from under the dash to see if the vent control switch is actually moving anything underthere.

Jul 02, 2010 | 1992 Chevrolet G20

1 Answer

What is a blender/ it is suposed to a part of the heater area


The "blender" would refer to the blend actuators that change the flow of air from floor to vent to defrost or combinations. Properly working blend doors will allow you to direct air to the dash vents, the floor, the defroster, the floor and defroster or the floor and dash vents. If it is not working the heater will still work but you will hae no control oer where the air flows.

Dec 19, 2009 | 1999 Jeep Grand Cherokee

2 Answers

No dashboard heat output


The climate control was poorly designed on these cars.

There is only heat on the floor and defrost settings, due to the layout of the ductwork.

Oct 22, 2008 | 1989 Ford Festiva

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