Question about 2003 Chevrolet TrailBlazer

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Have o3 trailblazer,blower only works on level 5

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Blower motor resistor may be bad

Posted on Feb 02, 2010

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Posted on Jan 02, 2017

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1 Answer

Heater setting not working correctly, wont work all the time


Blower motor relay , resistor , control module . any one of these could be the culprit . You have to test to determine which one is at fault ! Do you have a DVOM - digital volt ohm meter an do you know how to use it ? Heater Blower Motor Troubleshooting Blower Motor Problems Auto Repair Help

Jan 12, 2016 | 2003 Chevrolet TrailBlazer

1 Answer

Blower only works on level 1, 2 and 3


You need to check the wiring connector for the resistor pack, sometimes the connections overheat and melt the plastic.

Apr 13, 2013 | 2004 Chevrolet TrailBlazer

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I have a 2003 trailblazer my fan clutch also clicks when idiling or in park. It has been replaced under warranty once and continued doing the clicking...My question is that now the levels to blow out the...


Let it click. The new ones don't last long either. I've replaced mine twice 6months it's clicking again but lasts about 12-24 months before it needs replacing

Jun 18, 2011 | 2003 Chevrolet TrailBlazer

1 Answer

My heater works on all levels except #5, what's wrong?


If you have manual controls for your blower, meaning a knob that you turn from 1 through 5, replace your blower motor resistor module. Very easy job and a common problem.

Feb 02, 2011 | 2006 Chevrolet Trailblazer

1 Answer

2002 trailblazer heater fan won't work on numbers 1,2 and 3 but does work on 4 and 5 . what could the problem be?


Replace your blower motor resistor module. Located under the glove box on the bottom of the blower.

Dec 01, 2010 | 2002 Chevrolet TrailBlazer

1 Answer

2005 Trailblazer EXT. Blower speed control not working...


Problem with blower motor is the blower motor resistor. They are usually located next to the blower motor, a couple of screws and a couple of plugs and your done. Autozone sells them for around $30 each. Wipers you may want to check for relays under the hood in the fuse block. There may be 2 relays 1 for low and 1 for high. I have switched relays from other working accesories and got wipers to work. Sometimes bad connection.

Mar 19, 2010 | 2002 Chevrolet TrailBlazer

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