2005 Trailblazer Blower only works on 5 - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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  #1  
Old 02-05-2017, 01:42 PM
ChevyTB2005 ChevyTB2005 is offline
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2005 Chevy TrailBlazer LS
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2005 Trailblazer Blower only works on 5

Hello! I have a 2005 Trailblazer 4.2L and the blower motor will only work on setting 5. I have already tried replacing the blower motor resistor, and the climate control module in the center console/dash. What else could be causing this odd behavior?

Thanks.
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  #2  
Old 02-05-2017, 07:10 PM
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LMMJ LMMJ is offline
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check fuse in underhood fuse block
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Old 02-05-2017, 08:28 PM
ChevyTB2005 ChevyTB2005 is offline
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Originally Posted by LMMJ View Post
check fuse in underhood fuse block
Yes, that was one of the first things I checked unless there is a separate fuse somewhere? Again the blower motor works on setting 5, but none of the other settings so that tells me 12V is getting to the switch and to the motor. Any other ideas? I;m sure someone out there has had this issue, but I couldn't find anything besides "replace the resistor", or "replace the climate control module" It's also a manual climate control btw. Thanks
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Old 02-06-2017, 03:53 PM
ChevyTB2005 ChevyTB2005 is offline
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Any other ideas?
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Old 02-10-2017, 02:52 AM
TopOx TopOx is offline
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Power input with a volt meter at the motor could be motor has excessive resistance that the lower voltage from the blower motor resistor isn't enough to turn the motor unless it has full power

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Old 02-21-2017, 05:03 PM
ChevyTB2005 ChevyTB2005 is offline
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Originally Posted by TopOx View Post
Power input with a volt meter at the motor could be motor has excessive resistance that the lower voltage from the blower motor resistor isn't enough to turn the motor unless it has full power

Sent from my XT1650 using Tapatalk

Ok, I measured the voltage at the terminal going into the blower motor. While unplugged with the car on it's setting 0, 0 volts, settings 1-4, 9 volts, and setting 5, 13.9 volts. When the blower motor is plugged in, settings 1-4 measure 0.09 volts. Setting 5 measures about 13.5 volts and another anomaly is when the blower is switched off from setting 5, the ABS and brake light flash for a moment. Interesting, no?

I don't have another blower motor to test with, but I've been through 3 resistors all with the same effect and 2 climate control modules. Thanks.
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Old 02-21-2017, 05:51 PM
rockp2 rockp2 is offline
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I am looking at the wiring diagram for an 02 TB, but I believe the circuit is the same or close enough for your truck. When the blower is switched to the highest setting power comes from the 40a Blower Fuse in the UBEC. However, for all other settings blower motor power comes from the 30a "HVAC" in the Rear Fuse Block located under the left rear seat (there's more than one fuse for HVAC there, but you want the one named "HVAC" specifically).

If that does not help, let me know if your truck is the long or short wheel base and whether or not it has rear entertainment and I'll take a look at the correct diagram (for an '02) to try and help you further diagnose the circuit.

If your interested in seeing your exact wiring diagram you can get a subscription to alldatadiy.com for less than $20 (I think). This is an electronic version of the shop manual used at the dealerships.
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Old 02-21-2017, 06:12 PM
ChevyTB2005 ChevyTB2005 is offline
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Quote:
Originally Posted by rockp2 View Post
I am looking at the wiring diagram for an 02 TB, but I believe the circuit is the same or close enough for your truck. When the blower is switched to the highest setting power comes from the 40a Blower Fuse in the UBEC. However, for all other settings blower motor power comes from the 30a "HVAC" in the Rear Fuse Block located under the left rear seat (there's more than one fuse for HVAC there, but you want the one named "HVAC" specifically).

If that does not help, let me know if your truck is the long or short wheel base and whether or not it has rear entertainment and I'll take a look at the correct diagram (for an '02) to try and help you further diagnose the circuit.

If your interested in seeing your exact wiring diagram you can get a subscription to alldatadiy.com for less than $20 (I think). This is an electronic version of the shop manual used at the dealerships.

I shall look tonight or tomorrow morning and let you know. Thanks
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  #9  
Old 03-20-2017, 11:50 PM
ChevyTB2005 ChevyTB2005 is offline
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2005 Chevy TrailBlazer LS
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Problem solved!

The solution? The ignition switch. Why? Very bad engineering on GM's part.

Got fed up with this thing after replacing the switch (climate control module), the blower motor resistor, then the blower motor itself. Took it to an auto/electrical shop and they traced the problem to the ignition switch. Why does the blower motor run through the ignition switch? You got me, very bad engineering. Just like my 02 Impala. The turn signals randomly stop working, the reason? The turn signals go through the hazard light switch and if that messes up, it takes the turn signals with it. Total cost was roughly $350

Now onto figuring out why it's missing at idle.
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