Question about 2004 Chevrolet TrailBlazer

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My 2004 trailblazer when I press the button for vents to blow cold air , will not blow out vents only floor or dash.

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  • Chevrolet Master
  • 1,250 Answers

Usually door for HVAC will act like this when there a faulty code. it is a default mode when BCM see a problem
have code retrieve
hope it helps

Posted on Mar 29, 2014

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6 Suggested Answers

6ya6ya
  • 2 Answers

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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

  • 20 Answers

SOURCE: Heat wont blow through heater or defroster vents

common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.

Posted on Feb 23, 2009

  • 169 Answers

SOURCE: my 2002 trailblazer is making a clicking noise in the a/c

more likely a broken door in hvac case.with car running work controls and watch actuaters operate to locate good luck maybee a little challange

Posted on Aug 30, 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

c17hydro
  • 2984 Answers

SOURCE: location and removal of the air vent actuator

Removal & Installation

  1. Remove the floor air outlet duct extension from the floor duct.
  2. Remove the center console, if equipped.
  3. Remove the screws from the center console duct, if equipped.
  4. Remove the center console duct, if equipped.
  5. Disconnect the electrical connection at the mode actuator.
  6. Remove the mode actuator mounting screws from the HVAC module.
  7. Remove the mode actuator as an assembly with the actuator cam.

98d9332.gif
Mode actuator location

To install:
  1. Install the mode actuator as an assembly with the actuator cam.
  2. Line up the heater/defroster valve lever with the mode actuator cam slot.
  3. Line up the A/C valve lever with the mode actuator cam.
  4. Install the mode actuator mounting screw to the HVAC module and tighten to 14 inch lbs. (1.6 Nm).
  5. Connect the electrical connection at the mode actuator.
  6. Install the center console duct, if equipped.
  7. Install the screws to the center console duct, if equipped, and tighten to 14 inch lbs. (1.6 Nm).
  8. Install the center console, if equipped.
  9. Install the floor air outlet duct extension to the floor air duct.
  10. Calibrate the HVAC module actuators.

Posted on Apr 18, 2010

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9_9_2012_12_22_41_am.jpg

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this vehicle has electronic acuators that move the doors and do not use vacuum. the mode door actuator is bad causing this problem. there is a defrost acuator that works the defrost position and a mode door that works floor/vent operation. the defrost moves and diverts airflow up defrost vwents this is why you can still have defrost and floor.

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The heater / a/c vents are controlled by vacuum,or electronic devices. What is happening in your Trailblazer is the Vent Doors are either stuck in a open or closed position thus only having air flow to the floor vents only..The actual vent door is located in the heater box next to the blower motor.

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My 2002 trailblazer is making a clicking noise in the a/c


more likely a broken door in hvac case.with car running work controls and watch actuaters operate to locate good luck maybee a little challange

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Hope I was avle to help, glad you up and going.

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they are often operated by vacuum... look under the dash for any stray vacuum hoses...

Robert

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