How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask ZZDaryl Your Own Question
ZZDaryl, Chevy Technician
Category: Chevy
Satisfied Customers: 12549
Experience:  28 year experience, Master Mechanic
Type Your Chevy Question Here...
ZZDaryl is online now
A new question is answered every 9 seconds

Chevrolet Trailblazer: I have a 2004 Chevy Trailblazer and

This answer was rated:

I have a 2004 Chevy Trailblazer and I can not get the blower motor to work. I have changed out the resistor, fan and the connector with no luck. I checked my grounds and there good, I have no blown fuses so now I'm lost of what to do next, can you help.
Hello and thank you for trusting me with your question. My name is XXXXX XXXXX I will do my best to help you with your problem. Can you do electrical testing?
Customer: replied 3 years ago.

I took it to a shop and they said everything tested good

I do not know how everything can test good and the blower still does not work so it appears they do not know what they are doing or at the very least they missed something. So I am suspecting you can not do testing?
Customer: replied 3 years ago.

I have a meter but not one of those light sticks.

Ok is this a auto system or is everything all manual?
Customer: replied 3 years ago.


Ok great, can you unplug the blower motor and test to see if there is voltage on the purple wire with the blower switch set to HI. Let me know the results. If there is voltage plug the blower back in and then back probe the connector and see if there is still voltage on the purple wire.
Customer: replied 3 years ago.

No voltage on the wire

Ok at the blower resister unplug it and check the Red wire for voltage.
Customer: replied 3 years ago.

I have voltage on the red wire


Ok now with the blower on high, see if the orange wire to the resister has voltage, with the resister unplugged.
Customer: replied 3 years ago.

It has voltage on it

Ok plug the resister back in and see if the orange wire still is showing voltage, also I am wonder how much voltage these are showing?
Customer: replied 3 years ago.

I'm reading 12V-12.4V somewhere in there every time. That is crazy though, when plugged in nothing. I unplug it and get 12V again.

Ok great, we are getting close, there is a fuse under the left rear seat, fuse 44 HVAC fuse can you check the voltage on at? with everything plugged in.
Customer: replied 3 years ago.

It didn't read any voltage.

Ok, this whole situation with it having power when disconnected and no voltage when connected is a bad connection issue/bad circuit issue, that fuse gets its power from the ignition switch so I am thinking the ignition switch is bad or the connection at the ignition switch has a bad connection. To be 100% sure you need to check the orange wire to the ignition switch and see if it has voltage on it, if it does not disconnect the ignition switch and look at the connections to see if they look corroded at all, if they do not the switch is most likely bad. If the orange wire at the ignition switch does have power i would be suspecting a issue with the orange wire near that rear fuse box or within the fuse box itself. Let me know if you have more questions on this I am always willing to help, Thanks.
ZZDaryl and 3 other Chevy Specialists are ready to help you
Its getting late here so I need to go to bed, if you still need help I will be back on tomorrow so please feel free to ask, thanks.
ZZDaryl and 3 other Chevy Specialists are ready to help you
Customer: replied 3 years ago.

You were right, it was the wire under the rear fuse box. Think I will go have a nice chat with that shop tomorrow. Thanks again for the help, I just wish I would have used this site in the first place.

Great, I am glad you found the problem, thanks for the rating.