Question about 2004 Chevrolet TrailBlazer

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Air Conditioning A/C blows out the feet vents, but does not blow at all from the dash vents

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  • DBig2000 Aug 22, 2008

    the air conditioner on my 2003 trailblazer blows out of the floor vents when the switch is set to blow out of the vents on the dash. What could be causing this problem?

  • latindrill Aug 31, 2008

    The A/C on my 2004 trailblazer blows out of the floor vents when the switch is set to blow out of the vents on the dash. This happened after it was taken to have the transmission rebuild. How can I fix it this problem?

  • Anonymous Mar 24, 2014

    noise coming from under the dash board when the air condition or heater is on



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The control arm that controls where the air should blow is under the dash you may have to move it manually

Posted on Aug 31, 2008


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Posted on Jan 02, 2017

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i suspect the vents are controlled by vacuum and are not opening due to a vacuum leak.


Posted on Sep 01, 2008


vacuum leak or your control valve is defective

Posted on Jul 24, 2008

  • 59 Answers

SOURCE: no air flow to dash vents and feet vents

99% of the time when they do that it is the control head. that is the thing you adjust all your temp settings on. have to purchase from dealer. have last eight digits of vin # when ordering.

Posted on Dec 10, 2008

  • 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

  • 12 Answers

SOURCE: air conditioning not blowing thru the vents

There is a black vacuum hose in back of the glove box toward the top connected to a gray hose about 1/8 thick.You need to check to see if there is vacumm there.If yes then you need to take the bolts off to be able to tip the dash back enough to see all the vacuum hoses.Make sure they are all connected.It was alot of bolts but its is the best way.I had a hose off going to one of the acuator doors.Glued it back on and works great

Posted on Jul 17, 2011

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i suspect the vents are controlled by vacuum and are not opening due to a vacuum leak.


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