help with heater controls - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ocbaud · 07-02-2007, 12:50 AM

alright, look at this picture and tell me about it

this controls the door to the blower and heater and stuff. the only problem is, i dont see what controls it... if the blower is on any setting, it will blow a little out of the vents and mostly out of the bottom. if i move this thing manually to the left, it will stop blowing from the bottom and blow out of the top vents in the dash....

ocbaud · 07-02-2007, 01:38 AM

alright, looked at it some more. i guess the door is vacuum operated. well, if you look at the VERY bottom of my picture, you will see the little off white thing on the door. well its broke and not attached to the door anymore.... so the vacuum wouldnt pull it open or shut.

even though that is broke, switching between positions on the switch(heat, ac, vent, defrost) the arm doesnt move at all.

does anyone have a full diagram of how the vacuum lines should be for the heater/ac crap?

thanks

ARAMP1 · 07-19-2007, 05:12 PM

Did you ever get this fixed? I think mine is doing the same thing.

Malo83 · 07-20-2007, 03:19 PM

Quote:

Originally Posted by ocbaud

alright, look at this picture and tell me about it

this controls the door to the blower and heater and stuff. the only problem is, i dont see what controls it... if the blower is on any setting, it will blow a little out of the vents and mostly out of the bottom. if i move this thing manually to the left, it will stop blowing from the bottom and blow out of the top vents in the dash....

Eric is that looking up into the dash or straight ahead at the firewall?, thinking this might be whats wrong with my AC not blowing cold air at idle as stated in my previous post on R12/R134 conversions

ocbaud · 07-20-2007, 10:46 PM

fire wall

i had to replace the plastic tab that was broken. $2.xx part at gm

**crossy** · 07-21-2007, 12:04 PM

you said the door was still not working? there is a small vacuum line that goes through the firewall to the engine side and that is where the switch gets it 'feed' from. BE SURE you have full vacuum to the switch itself at the control panel. I have seen those vacuum lines collapse because of so many years in the engine bay.
go from there. crossy

07-02-2007, 12:50 AM	#1
ocbaud Garage Queen Material Join Date: Oct 2002 Location: USA Posts: 4,129	help with heater controls alright, look at this picture and tell me about it this controls the door to the blower and heater and stuff. the only problem is, i dont see what controls it... if the blower is on any setting, it will blow a little out of the vents and mostly out of the bottom. if i move this thing manually to the left, it will stop blowing from the bottom and blow out of the top vents in the dash....

07-02-2007, 01:38 AM	#2
ocbaud Garage Queen Material Join Date: Oct 2002 Location: USA Posts: 4,129	Re: help with heater controls alright, looked at it some more. i guess the door is vacuum operated. well, if you look at the VERY bottom of my picture, you will see the little off white thing on the door. well its broke and not attached to the door anymore.... so the vacuum wouldnt pull it open or shut. even though that is broke, switching between positions on the switch(heat, ac, vent, defrost) the arm doesnt move at all. does anyone have a full diagram of how the vacuum lines should be for the heater/ac crap? thanks

07-19-2007, 05:12 PM	#3
ARAMP1 ROCK*STAR Join Date: Aug 2005 Location: Pensacola, FL Posts: 202	Re: help with heater controls Did you ever get this fixed? I think mine is doing the same thing.

07-20-2007, 10:46 PM	#5
ocbaud Garage Queen Material Join Date: Oct 2002 Location: USA Posts: 4,129	Re: help with heater controls fire wall i had to replace the plastic tab that was broken. $2.xx part at gm

07-21-2007, 12:04 PM	#6
crossy Oh,you can't buy that new Join Date: Apr 2000 Location: Pennsville,N.J. 08070, USA Posts: 2,039	Re: help with heater controls you said the door was still not working? there is a small vacuum line that goes through the firewall to the engine side and that is where the switch gets it 'feed' from. BE SURE you have full vacuum to the switch itself at the control panel. I have seen those vacuum lines collapse because of so many years in the engine bay. go from there. crossy __________________ "been there, done that, ruined the T-shirt". 2007 LBZ GMC Sierra, ECSB 2006 LM7 RCSB Silverado 98 Vortec project. 94,3500,6.5L 4L80 81 SWB GMC POS finally gone 73 Pinto, stock, w/CragarSS's-eww LOTS of Cummins trucks.



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