Question about 2004 Chevrolet TrailBlazer

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I put a new battery in my GMC Trailblazer and the AC fan stopped working. The defrost still works and apparently the floor vent. What's the problem?

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  • 7 Answers

If the switch was on when you installed the new battery, or if you were jumped of by a vehicle with a stronger battery prior discovering you needed a new battery, then you probably created a power surge and fried the points in the switch. Try replacing the switch.

Posted on May 14, 2014

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Posted on Jan 02, 2017

  • 28 Answers

SOURCE: Defroster & floor blowers don't work but front facing vents do

There are what they call mode door's these days they have a electrical motor that turnes the door to different posistions...sounds like yours is become broken. It would depend on your expertise in the ac & heating system area to replace the part. Sometimes easy and most of the times the dash has to be removed.

Posted on Apr 02, 2009

outdoorsman5
  • 631 Answers

SOURCE: ac and heat will not blow threw vents just floor and defrost

Sounds like your selector switch is messed up to select where you want the flow of air to go. When you turn the switch to where you want the air to go does it work on floor and when you turn the switch to vent it doesn't?

Posted on Jul 28, 2009

  • 204 Answers

SOURCE: 03 trailblazer all four dashboard vents do not work

You may have a blocked vent system.

Posted on Feb 03, 2010

  • 2 Answers

SOURCE: ac only blows out floor and defrost vents 95 camaro

Could it be a possibility that your switch is broken to that setting. Try popping off the knob with a screw driver, taking pair of pliers and twisting the knob. Feel for it switching settings.

Posted on Apr 17, 2010

cherrychevys
  • 55 Answers

SOURCE: After having to replace my

You need to perform a hard computer reset. which you basically did when you removed the batter, but this time, disconnect the battery and let it run down, move the a/c switches into the off position, then reconnect the battery after about 10 minutes. turn the key to the on position but do not start the engine. leave it like this for two minutes, you will hear the a/c cycling. after the two minutes are up, start the vehicle and let it run a while, (30 seconds) then turn on the a/c to the cold temp and low fan speed setting, it should cycle and come out the vents. if not you have the common fault code that will have to be reworked by gm. but most times this is the easy cheap and free fix.

Posted on Aug 08, 2010

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1 Answer

AC has barely any pressure unless on high and only getting hot air.


check the cabin air filter if equipped, Make sure that the air is not coming out of the floor vents or defrost. The door that diverts the air maybe stuck, pushing air out defrost/floor vents

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Does the ac unit fans come on? Also if it does come on is it only on bottom floor vents, or defroster only.

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I have a 2003 GMC Envoy. AC blowing cold, just not out front vents


Yep, when you put the new battery in, it blew your actuators, PIA job, but can be done. You can TRY disconnecting battery again, but I'm betting your actuators just blew. Very common problem with our platform, poor design.

May 17, 2017 | 2003 GMC Envoy

1 Answer

AC works fine at first then stops blowing thru dash vents and will only blow thru defrost and floor vents. this is an 02 chevy trailblazer. It this an expensive thing to fix?


It's most likely a vacuum line, look under your hood (close to the cowl panel) for a disconnected, cracked or broken vacuum line.

In some rear cases, it could be the vacuum switch (in dash). Or vacuum diaphragm (under dash).

Hope this helps you ???

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1 Answer

2003 Trailblazer No air from front face vents


first check to see if you have power going to the actuators when you switch the switch to it location if no power replace controller if you have power and no movement from actuators replace actuator. if actuators move remove hvac box and check for broken blend doors.

Jan 22, 2010 | 2003 Chevrolet TrailBlazer

1 Answer

The heater / ac control only works with one or two desired settings.defrost will not work at all (2006 chevy trailblazer)


The actuator motor that controls the defrost,to floor,to vent ,has gone out,this will be a job to take to the shop,the dash will have to be pulled out toward the seats to replace the actuator motor.

Jan 21, 2010 | 2006 Chevrolet Trailblazer

1 Answer

Heater/AC vent option knob produces knocking sound in back right corner. i.e. the knob rotates from vents in front to half front half floor to all floor to half floor half defrost to all defrost. the...


If I am reading correctly you are hearing the vent doors moving to redirect the airflow to the vents you choose. This is normal and can be more noticeable if the blower fan is on, putting air pressure against the doors.

Jan 09, 2010 | 2003 Chevrolet TrailBlazer

1 Answer

Ac and heat will not blow threw vents just floor and defrost


Sounds like your selector switch is messed up to select where you want the flow of air to go. When you turn the switch to where you want the air to go does it work on floor and when you turn the switch to vent it doesn't?

Jul 11, 2009 | 2004 Chevrolet TrailBlazer

1 Answer

2005 trailblazer dash vents not working


CHECK TO SEE IF A VACCUM LINE DISCONECTED SOME HOW. OR YOU CAN CHECK BEHIND GLOVE BOX TO SEE IF VACCUM DOOR IS OPERATERING PROPERLY,NOT SURE IF IT IS THE SAME AS A 2003 S-10 BLAZER.

Oct 26, 2008 | 2003 Chevrolet Blazer

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