Heater blower stopped working with AC Delete - The 1947 - Present Chevrolet & GMC Truck Message Board Network

steves1967 · 12-10-2023, 10:59 PM

My 71 Chevy came with AC. I swapped out the Ac heater box for a non AC heater box from ACdelete.com. Problem now is the heater blower won't turn on. The only brown wire plugged back into the fan, and I have this one plug that isn't connected. Where should I start looking for the problem? I really need the defroster to work!!

**Getter-Done** · 12-10-2023, 11:15 PM

Pictures would help.
Is the heater resistor plugged up?
Did the kit include the resistor ?

Here is a wiring diagram: http://www.chrismeadtattoos.com/wiri...ruckwiring.jpg

**Richard** · 12-12-2023, 10:49 PM

Did you connect the ground wire to blower motor housing when you changed the outer firewall housing?

**HO455** · 12-13-2023, 05:03 PM

Since you had AC and need defroster power you might consider using your old AC blower motor and some of the old AC wiring to give your heat/defroster blower an upgrade. I got about 80% more airflow over my old blower when I was done.

Link is to how I did mine. Starting at post 871 on continuing on to the next page.

http://67-72chevytrucks.com/vboard/s...698377&page=35

And as other folks have said we need more information. What wires have you connected to what would be a good start.

12-10-2023, 10:59 PM	#1
steves1967 Registered User Join Date: Dec 2001 Location: Manteca, Ca USA Posts: 305	Heater blower stopped working with AC Delete My 71 Chevy came with AC. I swapped out the Ac heater box for a non AC heater box from ACdelete.com. Problem now is the heater blower won't turn on. The only brown wire plugged back into the fan, and I have this one plug that isn't connected. Where should I start looking for the problem? I really need the defroster to work!! __________________ '71 Chevy 3/4 Ton Longbed '22 Chevy Tahoe RST '67 Firebird- 8 sec street car '24 GMC CC 4x4 Duramax Dually

12-10-2023, 11:15 PM	#2
Getter-Done Senior Member Join Date: Dec 2009 Location: TN. Posts: 8,441	Re: Heater blower stopped working with AC Delete Pictures would help. Is the heater resistor plugged up? Did the kit include the resistor ? Here is a wiring diagram: http://www.chrismeadtattoos.com/wiri...ruckwiring.jpg __________________ ________________________________________________________________________________________ ____________________________________________ 84 Chevy K-20 63 Impala (my high school car) http://67-72chevytrucks.com/vboard/s...Crew Cab Build

12-12-2023, 10:49 PM	#3
Richard Senior Member Join Date: Dec 1999 Location: Southern California Posts: 2,896	Re: Heater blower stopped working with AC Delete Did you connect the ground wire to blower motor housing when you changed the outer firewall housing? __________________ Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746

12-13-2023, 05:03 PM	#4
HO455 Post Whore Join Date: Feb 2016 Location: Portland Oregon Posts: 11,393	Re: Heater blower stopped working with AC Delete Since you had AC and need defroster power you might consider using your old AC blower motor and some of the old AC wiring to give your heat/defroster blower an upgrade. I got about 80% more airflow over my old blower when I was done. Link is to how I did mine. Starting at post 871 on continuing on to the next page. http://67-72chevytrucks.com/vboard/s...698377&page=35 And as other folks have said we need more information. What wires have you connected to what would be a good start. __________________ Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help. RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377



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