Register or Log In To remove these advertisements. |
|
|
|
Thread Tools | Display Modes |
Yesterday, 09:01 PM | #1 |
Senior Member
Join Date: Jul 2006
Location: Midlothian TX
Posts: 336
|
Heater Fan doesn't blow on low
A/C cab fan motor doesn't blow on low at all. Will blow on medium sometimes and will blow on high always. Where should I start?
|
Yesterday, 09:15 PM | #2 |
Senior Member
Join Date: Dec 1999
Location: Southern California
Posts: 2,816
|
Re: Heater Fan doesn't blow on low
The resistor in the ducting, fan switch and connector on fan switch.
__________________
Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746 |
Yesterday, 09:37 PM | #3 |
Senior Member
Join Date: Jul 2006
Location: Midlothian TX
Posts: 336
|
Re: Heater Fan doesn't blow on low
|
Yesterday, 10:11 PM | #4 |
Senior Member
Join Date: Apr 2016
Location: Cypress, TX
Posts: 3,738
|
Re: Heater Fan doesn't blow on low
In the heater core box attached to the firewall inside the cab. Here the box is shown removed and upside down while I was working on it. There is a little door through which you can peek at the resistor board, but to get real access you need to take more apart.
|
Yesterday, 10:56 PM | #5 | |
Senior Member
Join Date: Jul 2006
Location: Midlothian TX
Posts: 336
|
Re: Heater Fan doesn't blow on low
Quote:
|
|
Yesterday, 10:57 PM | #6 |
Senior Member
Join Date: Dec 1999
Location: Southern California
Posts: 2,816
|
Re: Heater Fan doesn't blow on low
What dmjlambert said. In his provided pic you can see two screws, They hold the "S" duct adapter in place. Remove those screws and the ones securing the "S" duct to have access. Not real difficult. The resistor is available at many vendors, here is one of my go to places https://classicparts.com/1964-72-a-c...-w-factory-air
__________________
Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746 |
Yesterday, 11:07 PM | #7 | |
Senior Member
Join Date: Jul 2006
Location: Midlothian TX
Posts: 336
|
Re: Heater Fan doesn't blow on low
Quote:
|
|
Yesterday, 11:14 PM | #8 |
Senior Member
Join Date: Dec 1999
Location: Southern California
Posts: 2,816
|
Re: Heater Fan doesn't blow on low
Look at the heat outlet on the floor above the transmission hump. Left to right- Heat outlet, "S" duct then the fitting screwed the the box shown. As mentioned, pic shows box upside down.
__________________
Richard 1972 K10 Custom Deluxe SWB Fleetside My build https://67-72chevytrucks.com/vboard/...d.php?t=800746 |
Bookmarks |
|
|