Blower fan issue 2018 Silverado

Doug Domm · 07-11-2024, 09:55 PM

The blower fan only runs for 3-4 seconds then quits, turn off the AC then turn the AC back on and fan only runs 3-4 seconds again. The fan will run at whatever speed was selected but only for that 3-4 seconds. Does the same thing operating the heater. Zero previous indication of the blower motor not being happy. A local AC tech with many years experience suggested disconnecting the battery for 10 minutes. Tried that and still the same issue. Thanks for any help. Doug

340Cuda · 07-13-2024, 01:47 PM

Just a wild guess, any chance it is on a circuit breaker rather than a fuse?

Good luck!

FED 387 · 07-13-2024, 10:46 PM

look into blower motor resistor--age of battery---cabin air filter ---all things to consider ----maybe blower motor itself ----not out of the realm of possibility---FED 387

Doug Domm · 08-28-2024, 09:43 PM

It was the blower fan resistor. No resistor to be sold separately at any local supplier. I got a used blower fan with the resistor from a totaled 13,000 km truck and solved the problem. Nobody local had a new fan unit in stock either but I found that ultra low mileage used one from an insurance vehicle salvage operation.

07-11-2024, 09:55 PM	#1
Doug Domm Member Join Date: Apr 2006 Location: canada Posts: 248 Likes: 27 Liked 84 Times in 21 Posts	Blower fan issue 2018 Silverado The blower fan only runs for 3-4 seconds then quits, turn off the AC then turn the AC back on and fan only runs 3-4 seconds again. The fan will run at whatever speed was selected but only for that 3-4 seconds. Does the same thing operating the heater. Zero previous indication of the blower motor not being happy. A local AC tech with many years experience suggested disconnecting the battery for 10 minutes. Tried that and still the same issue. Thanks for any help. Doug

07-13-2024, 01:47 PM	#2
340Cuda VIP Member Join Date: Apr 2003 Location: Tulsa, Oklahoma Posts: 1,617 Likes: 3,534 Liked 716 Times in 308 Posts	Re: Blower fan issue 2018 Silverado Just a wild guess, any chance it is on a circuit breaker rather than a fuse? Good luck!

07-13-2024, 10:46 PM	#3
FED 387 VIP Member Join Date: Jun 2006 Posts: 3,374 Likes: 422 Liked 301 Times in 161 Posts	Re: Blower fan issue 2018 Silverado look into blower motor resistor--age of battery---cabin air filter ---all things to consider ----maybe blower motor itself ----not out of the realm of possibility---FED 387

08-28-2024, 09:43 PM	#4
Doug Domm Member Join Date: Apr 2006 Location: canada Posts: 248 Likes: 27 Liked 84 Times in 21 Posts	Re: Blower fan issue 2018 Silverado It was the blower fan resistor. No resistor to be sold separately at any local supplier. I got a used blower fan with the resistor from a totaled 13,000 km truck and solved the problem. Nobody local had a new fan unit in stock either but I found that ultra low mileage used one from an insurance vehicle salvage operation.