Question about 2004 Chevrolet Silverado

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I have a 2004 Silverado HD with dual climate control. The vents for the floor and defrost work fine but only one dash vent(drivers side next to radio) blow any air out. Any suggestions are greatly appreciated.

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There is an actuator located at the bottom of the dash .. just remove it and turn that little shaft with a pair of pliers gently one direction or the other and see if that's the problem if so replace that actuator,, ((((((( be shure to unplug the actuator before starting the truck )))) and disconnect your battery when u install the new actuator .... so the climate control can relearn its position for accurate door travel...

Posted on Nov 09, 2014

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Posted on Jan 02, 2017

  • 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

longbow243
  • 103 Answers

SOURCE: 2005 tahoe dual climate control, driver side blows HOT air.

You will need to replace the drivers side temp actuator. It is available at your local dealership.

Posted on Sep 01, 2009

  • 192 Answers

SOURCE: 2004 silverado with dual manual temperature

could be your controller or temp mix door

1. Gain access to the air temperature motor for circuit testing. There are 5 wires at the motor.

2. The Brown wire is ignition power.

3. The Yellow wire is a ground at all times, through the control head.

4. The Light Blue/Black wire carries a 5-volt reference from the control head to the temperature motor.

5. The Light Blue wire is the feedback circuit to the control head and should measure between about 1 volt (cold) and 4 volts (hot). This feedback circuit operates similarly to a Throttle Position Sensor (TPS).

6. The Dark Blue wire is the motor control circuit sent from the control head.

7. When the control head sends out 5 volts on this wire, the motor moves towards hot.

8. When the control head sends out 0 volts, the motor moves towards cold.

9. When the temperature motor reaches the correct position (as measured by the feedback voltage on the Light Blue wire), the control head sends out 2.5 volts. This voltage signals the temperature motor to STOP and hold its present position.

10. Check for correct operation of these voltages.

11. In some cases, the air temperature door doesn't fit correctly in the plenum and will cause the air temperature motor to travel too far. This will cause the control head to become confused and operate erratically.

Posted on Oct 28, 2009

airjer995
  • 5332 Answers

SOURCE: 2004 Silverado 2500HD a/c is

Sounds like it is going through the recalibration process. We run into this issue when replacing the batteries on these. In the underhood fuse block there is a HVAC fuse. Pull it, wait 30 seconds, put it back in, and turn the key to the run position. You should hear the vents moving around. wait for about a minute or so, do not touch anything. If the self test/calibration passes everything will return to normal. If after several attempts you can not get it to return to normal than there is a problem with the HVAC system that will need to be resolved.

Posted on Sep 26, 2010

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1 Answer

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Check the actuator motor on the heater it directs the air into the vents. There is probably two of them be sure to check both. The motor makes the vents move and again directs the air where you want. Hope this helps.

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I had a similar issue on an 05 silverado. Air would only blow out of defrost vents. But this worked for me:

1) Unplug HVAC fuse for 10-30 seconds
2) Start truck
3) A/C comes out defrost - wait about 10 to 15 secs
4) A/C then starts coming out the floor vents for about 5 seconds
5) A/C then starts coming out the dash vents.
6) While the A/C is coming out the dash vents, turn A/C OFF (otherwise it cycles back to defrost for good).
7) Turn truck OFF
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1 Answer

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1 Answer

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