Question about 2003 Chevrolet Trailblazer Ext
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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Posted on Jan 02, 2017
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
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
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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