A/C Fan shutting off randomly? How to fix on a 2005 Chevy Suburban 

Yep. Fixed it

Did you ever find out the failure point of the blower motor resistor?

I did the permanent fix for it my blower motor turning off and on intermmitently on my 2003 Silverado. I bought an "add a circuit." I bought the 30 amp one. I pulled the 30 amp fuse out in the cab for the heater/AC hvac system and plugged in the add a circuit that has 2, 30 amp fuses in it with a pig tail coming out of it. I connected 8 ft of 14 gauge electrical wire to it with a butt connector. I ran the other end to the blower motor on the passenger side of the cab. I cut the pig tail off of the blower motor(the blower motor just has 2 wires coming out of it. A red and a black wire. I connected it to the red wire. The black wire on the blower motor I connected an eyelet to it and connected it to one of the glove box hinge screws which was a good ground. I cut the 8 ft piece of wire right above the transfer case shifter and installed a toggle switch from walmart. Now I can turn my blower motor off and on with that toggle switch. I only have high fan speed, but I don't care.

I did the permanent fix for it my blower motor turning off and on intermmitently on my 2003 Silverado. I bought an "add a circuit." I bought the 30 amp one. I pulled the 30 amp fuse out in the cab for the heater/AC hvac system and plugged in the add a circuit that has 2, 30 amp fuses in it with a pig tail coming out of it. I connected 8 ft of 14 gauge electrical wire to it with a butt connector. I ran the other end to the blower motor on the passenger side of the cab. I cut the pig tail off of the blower motor(the blower motor just has 2 wires coming out of it. A red and a black wire. I connected it to the red wire. The black wire on the blower motor I connected an eyelet to it and connected it to one of the glove box hinge screws which was a good ground. I cut the 8 ft piece of wire right above the transfer case shifter and installed a toggle switch from walmart. Now I can turn my blower motor off and on with that toggle switch. I only have high fan speed, but I don't care.

UPDATE: I did the permanent fix for it my blower motor turning off and on intermmitently on my 2003 Silverado. I bought an "add a circuit." I bought the 30 amp one. I pulled the 30 amp fuse out in the cab for the heater/AC hvac system and plugged in the add a circuit that has 2, 30 amp fuses in it with a pig tail coming out of it. I connected 8 ft of 14 gauge electrical wire to it with a butt connector. I ran the other end to the blower motor on the passenger side of the cab. I cut the pig tail off of the blower motor(the blower motor just has 2 wires coming out of it. A red and a black wire. I connected it to the red wire. The black wire on the blower motor I connected an eyelet to it and connected it to one of the glove box hinge screws which was a good ground. I cut the 8 ft piece of wire right above the transfer case shifter and installed a toggle switch from walmart. Now I can turn my blower motor off and on with that toggle switch. I only have high fan speed, but I don't care.

I did the permanent fix for it my blower motor turning off and on intermmitently on my 2003 Silverado. I bought an "add a circuit." I bought the 30 amp one. I pulled the 30 amp fuse out in the cab for the heater/AC hvac system and plugged in the add a circuit that has 2, 30 amp fuses in it with a pig tail coming out of it. I connected 8 ft of 14 gauge electrical wire to it with a butt connector. I ran the other end to the blower motor on the passenger side of the cab. I cut the pig tail off of the blower motor(the blower motor just has 2 wires coming out of it. A red and a black wire. I connected it to the red wire. The black wire on the blower motor I connected an eyelet to it and connected it to one of the glove box hinge screws which was a good ground. I cut the 8 ft piece of wire right above the transfer case shifter and installed a toggle switch from walmart. Now I can turn my blower motor off and on with that toggle switch. I only have high fan speed, but I don't care.

What did you end up doing, Steven? I'm just cracking mine open right now

On my 2003 Silverado 2500HD I have to replace the $13 blower motor resistor on e-bay every 6 months. It sucks, but I have just started to look at it as the cost of doing business with that pickup. I have bought the $36 one at NAPA as well and that one only lasts 6 months too. When they go bad they do the same thing as what that guy said. The blower motor just keeps turning off and on and it is really annoying, when your trying to defrost the windshield. I also keep a 200 watt cigarette lighter windshield defroster in my pickup in-case the fan would totally quit working.

I did the permanent fix for it my blower motor turning off and on intermmitently on my 2003 Silverado. I bought an "add a circuit." I bought the 30 amp one. I pulled the 30 amp fuse out in the cab for the heater/AC hvac system and plugged in the add a circuit that has 2, 30 amp fuses in it with a pig tail coming out of it. I connected 8 ft of 14 gauge electrical wire to it with a butt connector. I ran the other end to the blower motor on the passenger side of the cab. I cut the pig tail off of the blower motor(the blower motor just has 2 wires coming out of it. A red and a black wire. I connected it to the red wire. The black wire on the blower motor I connected an eyelet to it and connected it to one of the glove box hinge screws which was a good ground. I cut the 8 ft piece of wire right above the transfer case shifter and installed a toggle switch from walmart. Now I can turn my blower motor off and on with that toggle switch. I only have high fan speed, but I don't care.

I did the permanent fix for it my blower motor turning off and on intermmitently on my 2003 Silverado. I bought an "add a circuit." I bought the 30 amp one. I pulled the 30 amp fuse out in the cab for the heater/AC hvac system and plugged in the add a circuit that has 2, 30 amp fuses in it with a pig tail coming out of it. I connected 8 ft of 14 gauge electrical wire to it with a butt connector. I ran the other end to the blower motor on the passenger side of the cab. I cut the pig tail off of the blower motor(the blower motor just has 2 wires coming out of it. A red and a black wire. I connected it to the red wire. The black wire on the blower motor I connected an eyelet to it and connected it to one of the glove box hinge screws which was a good ground. I cut the 8 ft piece of wire right above the transfer case shifter and installed a toggle switch from walmart. Now I can turn my blower motor off and on with that toggle switch. I only have high fan speed, but I don't care.

I did the permanent fix for it my blower motor turning off and on intermmitently on my 2003 Silverado. I bought an "add a circuit." I bought the 30 amp one. I pulled the 30 amp fuse out in the cab for the heater/AC hvac system and plugged in the add a circuit that has 2, 30 amp fuses in it with a pig tail coming out of it. I connected 8 ft of 14 gauge electrical wire to it with a butt connector. I ran the other end to the blower motor on the passenger side of the cab. I cut the pig tail off of the blower motor(the blower motor just has 2 wires coming out of it. A red and a black wire. I connected it to the red wire. The black wire on the blower motor I connected an eyelet to it and connected it to one of the glove box hinge screws which was a good ground. I cut the 8 ft piece of wire right above the transfer case shifter and installed a toggle switch from walmart. Now I can turn my blower motor off and on with that toggle switch. I only have high fan speed, but I don't care.