Question about 2005 Chevrolet Avalanche

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Air will not blow through defrost or floor. the air will only blow through the a/c vents.

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  • 284 Answers

You need to check the space between your heater core and your a/c condensor. Dirt and dust plug these up alot. It could also be your heater control switch itself, not allowing the heater door to switch over. If you don't hear a vaccuum sound when you change from vent to heater or defrosr, your switch/control is bad.

Posted on Jan 16, 2013

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: There is no air flow

You need part GM Part number 89018675 or ACDelco 15-73596. The Mode Selector Actuator. What happens is the part is a CHEAP part POORLY designed and when it goes to turn the flaps inside the HVAC unit its the plastic gear slips instead of turning the flap!!!

Just to forward you you might want a deal to install this art for you unless your good at fixing your own vehicle, because you need SMALL sockets and a lot of patience to get this part in!!!

The part is ALMOST directly above the steering shaft for your steering wheel, so theres a lot you got to remove before you will even see them!!!

I only recommend you to have a dealer put this part in for you, unless you have your own service manual!!

Because there is 5 of these darn things and if you pick the wrong one you will have to do it all over again!!!

3 on the Drivers side and 2 on the Passengers side!!

But replacing this part SHOULD solve all your problems!! AS it did for me and i was having the same issues as you have described!!


Posted on Jul 22, 2008

  • 599 Answers

SOURCE: A/C Blows out at feet or through defroster, not through dash

the ac blend door is out of adjustment or the the actuator is not working look behind the glove box and watch the arm move

Posted on Jul 24, 2009

morse008
  • 1111 Answers

SOURCE: 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

Posted on Sep 08, 2009

  • 432 Answers

SOURCE: All Air Conditioning blows our the defrost vents

Some thing you could look at would be this. The control is usually fed by a vacuum line or small hose thats is connected to your intake manifold.
With a cold engine,look for a skinny vacuum hose that runs from the intake toward the fire wall . It should be going inside the cab and connecting to the A/C vent control.Some times the hose becomes disconnected or splits or cracks due to heat under the hood.
Thats usually the trouble.
I hope this helps you.

Posted on Oct 06, 2009

  • 31 Answers

SOURCE: Heater blows out dash vents only. Will not blow

Sounds like the switch that closes and opens the door for the changing of air flow is bad.

Posted on Feb 17, 2010

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