Question about 2004 Chevrolet Silverado 1500 Crew Cab

1 Answer

My 2004 silverado crewcab battery went dead and was replaced. The Air conditioning system now only blows through the defrost vents and the dial to change the airflow does not work. Can this be reset?

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  • Jeffrey Turcotte
    Jeffrey Turcotte Sep 17, 2011

    try pulling the hvac fuse and waiting a while before reinstalling. Then turn the ignition on and see if the system will go thru calibration. If not, you will need a scan tool to make it calibrate.

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Turn the key on and make sure the blower motor is working. It doesn't matter what speed. Turn the key off. Pull the hvac1 fuse out of the under hood fuse box. Wait five minutes. Reinstall the fuse. Turn the key on, do not start the engine or touch the heater controls. You should hear the heat swiping through the different modes. After a couple of minutes it should stop. Turn the key off then start the vehicle. It may take several tries but eventually it should recalibrate.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Posted on Sep 17, 2011

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1 Answer

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...


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...

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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.

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02 SILVERADO. AIR ONLY BLOWS OUT DEFROST VENTS. REPLACED CONTROL PANEL. NO LUCK


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
8) Restart truck and it should work fine

(Found solution on another forum from user "ccurran")

May 15, 2011 | 2001 Chevrolet Silverado 1500

1 Answer

2004 Silverado 2500HD a/c is blowing out the defrost and will not switch to dash vents? When I turn the truck off and back on it will blow from floor vents, then dash vents, then blow out defrost vents....


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.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

Sep 26, 2010 | 2004 Chevrolet Silverado 1500 Crew Cab

1 Answer

Blowes air throught defrost vents only


its a problem with the switching mechanism. you have to look up under the dash to see if you can see where the switching mechanism is. if you can not see it from there youll have to remove complete center dash

Apr 04, 2010 | 2004 Jeep Grand Cherokee

1 Answer

04 silverado a/c, htr. controls. Only blows through defrost vents


sounds like your door blend actuator which is under the dash and a pain in the **** to replace

Feb 20, 2010 | 2004 Chevrolet Silverado 1500 Crew Cab

1 Answer

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Typically, you have a vacuum issue, air flow system is designed to FAIL in the defrost mode, so no vacuum, doors are spring loaded to blow out defrost ports.

Sep 25, 2009 | 2004 Chevrolet TrailBlazer

1 Answer

Drivers side AC goes hot, passenger side still blows cold


You have a vent control actuator motor stuck,or gone out.

Aug 10, 2009 | 2007 Chevrolet Silverado 1500HD

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