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09-22-2013, 09:05 PM
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#1 |
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GM ONLY BABY!!!
Join Date: Oct 2003
Location: Fort Wayne, IN.
Posts: 1,998
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Heater control vacuum hoses?
I'm not sure which vacuum hose goes where on the heater contol vacuum switch because I am not getting vacuum to the heater valve or flapper doors. I have a 72 GMC with factory a/c and it has 3 ports on the vacuum switch. 1 of them is plugged. It's a real p-i-t-a to get to it also. I just repainted and rebuilt the whole truck so I just marked the lines when I removed them. I also installed new vac hoses as well. If you are looking up at it the hose closest to the front of the truck is blocked off and always has been. Is this correct? IIRC the ports are labeled 1,2,3. Also, which port do I connect to vacuum canister?
__________________
2 wrongs don't make a right, but 3 lefts do. 66 Chevelle Malibu 406ci, 573hp, 10.99@121mph 96 Chevy Silverado Z71 72 GMC 1500 Super Custom LS 6.0/4L65 on airride   http://www.cardomain.com/ride/707879...mc-c-k-pick-up |
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09-22-2013, 09:27 PM
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#2 |
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Registered User
Join Date: Sep 2012
Location: San Antonio, TX
Posts: 1,026
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Re: Heater control vacuum hoses?
I had to do this also. Here is a pic that should help.
Posted via Mobile Device Posted via Mobile Device
__________________
Jeff 1972 Cheyenne Super SWB 350, Auto, Bucket Seats w/Console, Tach, Factory A/C, P/S ,P/B, Tilt 1998 Chevy 1500 Ext Cab 5.7, Pewter w/blue interior |
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09-22-2013, 09:49 PM
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#3 |
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GM ONLY BABY!!!
Join Date: Oct 2003
Location: Fort Wayne, IN.
Posts: 1,998
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Re: Heater control vacuum hoses?
I have that pic. Just not sure which hose goes where.
__________________
2 wrongs don't make a right, but 3 lefts do. 66 Chevelle Malibu 406ci, 573hp, 10.99@121mph 96 Chevy Silverado Z71 72 GMC 1500 Super Custom LS 6.0/4L65 on airride http://www.cardomain.com/ride/707879...mc-c-k-pick-up |
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09-22-2013, 09:52 PM
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#4 | |
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Registered User
Join Date: Sep 2012
Location: San Antonio, TX
Posts: 1,026
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Re: Heater control vacuum hoses?
Quote:
Posted via Mobile Device
__________________
Jeff 1972 Cheyenne Super SWB 350, Auto, Bucket Seats w/Console, Tach, Factory A/C, P/S ,P/B, Tilt 1998 Chevy 1500 Ext Cab 5.7, Pewter w/blue interior |
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09-22-2013, 09:53 PM
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#5 |
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Registered User
Join Date: Sep 2012
Location: San Antonio, TX
Posts: 1,026
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Re: Heater control vacuum hoses?
Do you have vacuum coming from engine to the vacuum canister?
Posted via Mobile Device
__________________
Jeff 1972 Cheyenne Super SWB 350, Auto, Bucket Seats w/Console, Tach, Factory A/C, P/S ,P/B, Tilt 1998 Chevy 1500 Ext Cab 5.7, Pewter w/blue interior |
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09-22-2013, 10:30 PM
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#6 | |
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GM ONLY BABY!!!
Join Date: Oct 2003
Location: Fort Wayne, IN.
Posts: 1,998
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Re: Heater control vacuum hoses?
Quote:
Yes. No vacuum at heater valve or either vent door.
__________________
2 wrongs don't make a right, but 3 lefts do. 66 Chevelle Malibu 406ci, 573hp, 10.99@121mph 96 Chevy Silverado Z71 72 GMC 1500 Super Custom LS 6.0/4L65 on airride http://www.cardomain.com/ride/707879...mc-c-k-pick-up |
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09-22-2013, 10:44 PM
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#7 | |
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Registered User
Join Date: Sep 2012
Location: San Antonio, TX
Posts: 1,026
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Re: Heater control vacuum hoses?
Quote:
Posted via Mobile Device
__________________
Jeff 1972 Cheyenne Super SWB 350, Auto, Bucket Seats w/Console, Tach, Factory A/C, P/S ,P/B, Tilt 1998 Chevy 1500 Ext Cab 5.7, Pewter w/blue interior |
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09-22-2013, 11:00 PM
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#8 |
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Registered User
Join Date: Sep 2012
Location: San Antonio, TX
Posts: 1,026
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Re: Heater control vacuum hoses?
Just checked mine the middle one goes to the vacuum canister and the one on the left closest to the screw for the cable goes to the vent on passenger door and the right one goes to heater valve. Start the truck and make sure you have vacuum going to the hose that is gonna go to the middle port on the AC switch.
Posted via Mobile Device
__________________
Jeff 1972 Cheyenne Super SWB 350, Auto, Bucket Seats w/Console, Tach, Factory A/C, P/S ,P/B, Tilt 1998 Chevy 1500 Ext Cab 5.7, Pewter w/blue interior |
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09-23-2013, 10:12 PM
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#9 |
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GM ONLY BABY!!!
Join Date: Oct 2003
Location: Fort Wayne, IN.
Posts: 1,998
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Re: Heater control vacuum hoses?
Ok. thanks!! I'll tear into it one of these days that I don't have to work 11 hours.
__________________
2 wrongs don't make a right, but 3 lefts do. 66 Chevelle Malibu 406ci, 573hp, 10.99@121mph 96 Chevy Silverado Z71 72 GMC 1500 Super Custom LS 6.0/4L65 on airride http://www.cardomain.com/ride/707879...mc-c-k-pick-up |
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09-25-2013, 12:04 PM
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#10 |
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GM ONLY BABY!!!
Join Date: Oct 2003
Location: Fort Wayne, IN.
Posts: 1,998
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Re: Heater control vacuum hoses?
Ok I have 16" at middle switch port. 3" at right kick panel pod which isn't moving. Barely 1" @ cowl pod and 0" @ heater valve. Guess I need a new vac switch on the heater?
Posted via Mobile Device
__________________
2 wrongs don't make a right, but 3 lefts do. 66 Chevelle Malibu 406ci, 573hp, 10.99@121mph 96 Chevy Silverado Z71 72 GMC 1500 Super Custom LS 6.0/4L65 on airride http://www.cardomain.com/ride/707879...mc-c-k-pick-up |
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