Question about 2003 Chevrolet TrailBlazer
The blower motor relay is stuck on,It is most likely a module on this model,it is right next to the blower motor.
Posted on Feb 04, 2010
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Posted on Jan 02, 2017
The switch , relay, or motor are shorted out .
First locate relay and remove it to turn the blower off.
If you want to do the diagnosis yourself ...remove the switch first and see if the motor stops. if it does you've found the culprit. If not move onto relay if the relay removal kills the motor thats good news. if it doesn't then this thing gets B+ right from the battery at HIGH SPEED. Your gonna need Shop Manual
to show you where this thing connects to the battery.
So either the switch, relay, motor , or resistors ( in your case where battery connects to the motor are your problems.
Unlessyour really good with electrical items pull the relay and bring it to a repair shop.
Posted on Mar 31, 2010
Testimonial: "Good info I thought it was a relay but couldn't find it . pulled the ones from behind the glove box no effect. A new blower motor was installed 3mon "
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