Question about 2003 Chevrolet Trailblazer Ext

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My 2003 Trailblazer Heat\AC will not blow air, comes on randomly while driving and can be controlled okay but is out again the next morning

The fan on my hvac will not blow when on. I can be driving down the road and it will come to life and I can control it and everything. I tried a reset i found which was press the rear and front defrost and the mode button all at once then turn off the defrosts and turn off the mode. not sure I did it right. Found the control module in the glove box and unplugged to try and reset but no go. Help Please! Thanks!!

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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emissionwiz
  • 77202 Answers

SOURCE: HVAC duct

This is caused by a loose of vacuum to the mode control switch, the vacuum line runs through the firewall on the passenger side near the kick pad trim.

Posted on Nov 05, 2008

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  • 1118 Answers

SOURCE: 1995 Suburban HVAC - no defrost or vent only floor mode

I have a 1500 chevy picup that did the same thing the control panel (blower, temp, and selector) is what was the problem with mine replaced that and fixed it. Very easy to chg.front of dash pops off control panel pops out 1 plug ( yours may have 2 plugs)
pop back in and your done.

Posted on May 28, 2009

  • 4 Answers

SOURCE: where is the fuse for the rear window defroster on

Hi there. I assume you don't have a owner's manual, or know where the fuse box is...

Posted on Sep 28, 2009

  • 63 Answers

SOURCE: 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.

Posted on Jan 22, 2010

  • 251 Answers

SOURCE: 2003 Trailblazer rear defrost connection loose

On this year vehicle the flapper should be vacuum controlled. You may want to look at the vacuum lines going to and from the vacuum canister in the engine compartment. If it will change from floor to dash but not defrost then you may have a failed vacuum line or diaphragm in the dash from the selector.

Posted on Jun 07, 2011

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