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He blower motor cuts off at the max (5) setting?

Tiny
ECUELLO
  • MEMBER
  • 2005 CHEVROLET TRAILBLAZER
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 64,000 MILES
I recently replaced the blower motor resistor and the resistor connecter due to the blower not working at all. Now the blower motor cuts off at the max (5) setting. I back probed the blower motor connection and I have voltage and it switches all the way up to 4. As soon as I set it to 5, the voltage drops and the blower motor cuts out. I also replaced the heater/ac control module thinking that was the only possible solution but it still cuts out. Both Contol modules (old one & new one)cut out on the max setting. I have also tried 3 different resistors and still have the same problem. Any direction given will be greatly appreciated.
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Tuesday, December 8th, 2009 AT 6:27 PM

9 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Try checking the 40 amp fuse at the under hood fuse panel, here is the fuse location and a guide to help check it.

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Here is the blower motor wiring diagrams so you can see how the system works. Check out the diagrams (Below). Please let us know what happens.
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Tuesday, December 8th, 2009 AT 6:33 PM
Tiny
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By HVAC control module do you mean the actual unit that you can select speeds? The manual says that the blower motor relay is on the blower motor housing; can't find it. Help!
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Tuesday, December 8th, 2009 AT 9:18 PM
Tiny
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By HVAC control module do you mean the actual unit that you can select speeds? The manual says that the blower motor relay is on the blower motor housing; can't find it. Help!
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Tuesday, December 8th, 2009 AT 9:24 PM
Tiny
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Blower Motor Resistor Assembly Below right side of dash, near blower motor-sorry no pic's
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Tuesday, December 8th, 2009 AT 9:24 PM
Tiny
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By HVAC control module do you mean the actual unit that you can select speeds? The manual says that the blower motor relay is on the blower motor housing; can't find it. Help!

Already replaced blower motor resistor three different times thinking that they were defective.
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Tuesday, December 8th, 2009 AT 9:26 PM
Tiny
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Already replaced blower motor resistor three different times thinking that they were defective. Can anybody tell me where to locate the blower motor relay?
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Wednesday, December 9th, 2009 AT 10:48 AM
Tiny
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Try this: so much of auto references misdirections

Check in the underhood fuse block -see below Itme NO.1 for location of relay


https://www.2carpros.com/forum/automotive_pictures/12900_relay_1.gif

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Wednesday, December 9th, 2009 AT 10:57 AM
Tiny
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Replaced relay; checked all fuses, blower motor still cuts out when max speed is selected.

Is there a procedure for recalibrating the HVAC control module?

What other trouble shooting can I do?
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Wednesday, December 9th, 2009 AT 3:37 PM
Tiny
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Did you check the wiring from the diagrams above? You must have a broken wire.
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Wednesday, December 9th, 2009 AT 3:54 PM

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