Rear blower inop
CF Beginner
Joined: Jul 2023
Posts: 1
Likes: 0
Dude, your my hero!
OK, account is established. My reply to the above issue might be moot if the problem has been resolved.
I recently lost my rear blower meaning no flow was coming through the headliner vents. Assuming all of your fuses are good we will proceed to step one...
Step one:
After researching many threads on this issue I pulled back the R-Rear panel to expose the blower and resistor module (many threads suggest to replace the RM as a shotgun but at $200 I ain't gonna do it). My first goal was to establish that the ORANGE WIRE on the resistor module was HOT by using a TEST LIGHT and NOT a voltmeter. (Voltmeters consume very little current and may give a false sense of proper continuity.) My ORANGE WIRE had NO voltage when I probed it with a TEST LIGHT. The ORANGE wire should be HOT with the key off. So this means that the resistor module and blower are most likely good so we move on two step two...
Step two:
I removed the driver side kick panel by the emergency brake lever to expose a few wire connectors. The large 18-20 pin connector with the THICK ORANGE wire is the area of focus. Most of the wires in that connector are 16-18ga but the ORANGE wire is 10-12ga. My connector lugs were BURNED and made momentary contact. GM undersized the lugs so bypassing the connector is necessary.
Step three:
Cut the ORANGE WIRES on both sides of the connector and splice them together with a suitable quick connector or better yet solder them and insulate. THIS SOLVED MY ISSUE OF NO REAR AC BLOWING THROUGH THE ROOF VENTS.
I discovered this fixed by surfing around so I cannot take full credit but if you have basic skills and troubleshooting techniques this should be a simple DIY project that would cost less the $3 versus $350-$500 at a shop.
Time for a beer...
I recently lost my rear blower meaning no flow was coming through the headliner vents. Assuming all of your fuses are good we will proceed to step one...
Step one:
After researching many threads on this issue I pulled back the R-Rear panel to expose the blower and resistor module (many threads suggest to replace the RM as a shotgun but at $200 I ain't gonna do it). My first goal was to establish that the ORANGE WIRE on the resistor module was HOT by using a TEST LIGHT and NOT a voltmeter. (Voltmeters consume very little current and may give a false sense of proper continuity.) My ORANGE WIRE had NO voltage when I probed it with a TEST LIGHT. The ORANGE wire should be HOT with the key off. So this means that the resistor module and blower are most likely good so we move on two step two...
Step two:
I removed the driver side kick panel by the emergency brake lever to expose a few wire connectors. The large 18-20 pin connector with the THICK ORANGE wire is the area of focus. Most of the wires in that connector are 16-18ga but the ORANGE wire is 10-12ga. My connector lugs were BURNED and made momentary contact. GM undersized the lugs so bypassing the connector is necessary.
Step three:
Cut the ORANGE WIRES on both sides of the connector and splice them together with a suitable quick connector or better yet solder them and insulate. THIS SOLVED MY ISSUE OF NO REAR AC BLOWING THROUGH THE ROOF VENTS.
I discovered this fixed by surfing around so I cannot take full credit but if you have basic skills and troubleshooting techniques this should be a simple DIY project that would cost less the $3 versus $350-$500 at a shop.
Time for a beer...
Orange wire burned in two at the pins under dash on driver side. Clip both sides, bypass the plug! Presto!!!!! Working rear fan!!
CF Beginner
Joined: Jul 2023
Posts: 1
Likes: 0
Great discussion here, but my 01 Yukon XL has a slightly different problem that I''m hoping to get some advice on how to troubleshoot; in my case, the orange wire is good battery voltage (even jumped with my power probe to be sure), ground is solid, but I am only getting 1.0 volts from the purple wire, not matter which (front or rear) panel I change rear fan speed at. How can I go about finding the issue with the fan speed control wire without shooting the parts cannon and replacing the control panels unnecessarily.
CF Beginner
Joined: Jun 2025
Posts: 1
Likes: 1
Lifesaver
thank goodness for the internet and you guys taking your valuable time to assist in repairs like this. I just got done replacing compressor, condenser filter dryer and oriface. Front and rear ac worked awesome for one day then the rear blower quit. I was experiencing the weird issue where there was power in back but would handle no load. A quick peek in the driver kick panel and found light brown spots on the white connector. A quick splice around and the blower is working so well I can drown out the kids bitching from the backseat. Thanks again!!!
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