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Blower will not blow on speed 5 on my 03 Trailblazer?

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Blower control modular

Posted on Feb 01, 2010

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Why did my 02 trailblazer stop blowing ac through all the vents when, switched to heat it still doesn't blow air through the vents? I have no air flow what's wrong?? :(


First check all the fuses. There should be one for Blower or Heater. If all fuses are good, It is likely a bad blower motor or a switch to turn on the blower motor. Try all fan speeds in non auto mode and see if you get any activity. If you get activity on some fan speeds then it is the switch or sometimes called the blower motor resistor. If no activity, its time for a new blower motor. They are under the dash usually on the passenger side, shouldnt be too hard to pull out.

Aug 11, 2013 | 2006 Chevrolet Trailblazer

1 Answer

How do i install the blower motor in my 06 trailblazer?


if the blower motor is blowing on command and at the speeds you set it to then it is fine. What i have seen go bad is the blend door actuator. Its a little motor which activates a flap that changes cold to hot air. thats of course assuming that your hvac system uses an actuator. Most late model stuff has gone that route. the sctuator might be a real pain to get to as it will be located below the dash attached to the hvac system

Mar 01, 2013 | 2006 Chevrolet Trailblazer

1 Answer

The air on my 2003 trailblazer only blows when on 4 or 5


Check out the link below, your blower motor resistor pack is probably defective.

Blower Resistor Replace link
http://www.sparkys-answers.com/2009/01/2002-gmc-envoy-no-low-blower-speeds.html

Jul 27, 2011 | 2003 Chevrolet TrailBlazer

1 Answer

Heater/air condition will not blow on 3 and 5. Is the knob wore out and how do you change it/fix it.


this is more likely a blower motor resistor problem. The resistor controls fan speed, if faulty one or more or all speeds will not work. This blower motor resistor is located near the blower, It should be mounted upwards into the blower motor box, and have several wires connecting both units together (blower and resistor). hopefully this help'd

Oct 26, 2010 | 2005 Chevrolet Trailblazer Ext

1 Answer

02 Trailblazer Rear Blower Doesn't Always Blow.


More then likely the brushes are sticking in the blower motor.

Apr 19, 2017 | 2002 Chevrolet TrailBlazer

1 Answer

A/c fan not working on all speeds


Easy fix,there is a small electronic computer control that the blower motor runs through...can be mounted on the blower motor or under dash near floorboard,,,some of the circuits blow out and goes to failsafe mode and blows on one speed only...go to parts store and tell them whats happening and they should be able to tell you where its located...its a small elctronic circuit board,and should be under 50 bucks...hope this helps...Lee

Jul 30, 2009 | 2002 Chevrolet TrailBlazer

1 Answer

Blower motor problems/ac problems


List of possibilities :
blower motor
resistors
switch(On/OFF)

May 18, 2009 | 2006 Chevrolet Trailblazer

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