Question about 2006 Chevrolet Trailblazer

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Trailblazer vents wont change from defrost ,to your feet,to your face etc. 2004 just had air compressor replaced if that matters.

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System uses vacuum to operate the doors. Defaults to defrost when vacuum fails. Vacuum line from engine intake manifold is probably off or perhaps leaking--may have been disturbed during the other repair work. look for small loose vacuum line in engine compartment.

Posted on Aug 27, 2010

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99 wrangler air (no AC) only comes out of defrost vents, no matter what selection the knob is on (ie.vent, feet, feet/vent, etc)..what causes this?


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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

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Sep 25, 2009 | 2004 Chevrolet TrailBlazer

1 Answer

A/C problems with blower and position selector


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1 Answer

The Air flows through only the defrost and feet vents


Inside the ventilation system there is gates that open and close to direct the air flow. These are operated on vacuum on most vehicles. The hose for that perticular gate may have disconnected somehow or has a hole in it. I suggest you take the heater controls out and see if there is a plug with a series of colored hoses on it. it so you'll have to trace each of them to see which one is the problem. Now you may be able to get some help from you local dealers mechanic who just may know the color code for that gate. (which would be a bonus) Good Luck

May 28, 2009 | 2004 Oldsmobile Alero

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Air conditioner makes noise which increases as you rev the engine and slows as you take foot off the gas.also, the front vents (by the windshield) also noisy when you switch to them,opposed to having the...


YOU SEEM TO HAVE A LOOSE OR BAD AC COMPRESSOR DRIVE BELT. WHEN YOU SWITCH THE TO THE VENTS CLOSE TO THE WINDSHIELD IT TURN THE AC COMPRESSOR CLUTCH ON, IT ACTIVATES THE DEFROST. TRY POURING SOME WATER ON THE AC BELT AND SEE IF NOISE GOES AWAY. THE BELT MAY NEED ADJUSTMENT OR MAY NEED TO BE REPLACED. GOOD LUCK

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Front defrost not working 2004 Pacifica


I did not have defroster or venting to the feet. All I had was vent. I brought it to the shop they replaced the mode door actuator which flips the doors inside to make it flow to the defrost or vent etc; This cost me $210.00. They had to take the dash apart plus disengage the air bag under the steering wheel to get to the actuator.

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