Topic: 1972 AC/Heater Vacuum Question
in Forum: C3 Cooling and Heating Systems
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Evansville`, IN - USA
Joined: 6/25/2007
Posts: 46
Vette(s): 1972 Convertible, ontario orange, ps/pb/pw/air conditioning and 31,000 original miles.
Does anyone have a good diagram of how the vacuum hoses should be connected for a 1972? I don't think my are working correctly. When I have the control on Vent, my right side kick panel vent closes. It's open in all the other settings. Doesn't this allow outside air to come in? Shouldn't this be closed in all operations exept for when I have the control setting on Vent? Thank you, David
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No, as I understand it, the right side kick panel door is the recirculate door and should be open in the Max a/c position so the fan can recycle interior air.
edit...To add to this, there is a door in the plenum just below the right wiper arm pivot mount that should be open for all operations except MAX. This allows outside air into the system. In MAX, it closes and the door behind the right kickpanel opens, to recycle the cooler interior air.
|UPDATED|2/3/2013 12:59:27 PM (AZT)|/UPDATED|
edit...To add to this, there is a door in the plenum just below the right wiper arm pivot mount that should be open for all operations except MAX. This allows outside air into the system. In MAX, it closes and the door behind the right kickpanel opens, to recycle the cooler interior air.
|UPDATED|2/3/2013 12:59:27 PM (AZT)|/UPDATED|
Former Member
Send PM
Evansville`, IN - USA
Joined: 6/25/2007
Posts: 46
Vette(s): 1972 Convertible, ontario orange, ps/pb/pw/air conditioning and 31,000 original miles.
F4GAry, thanks for clearing that up for me. I guess everything is working afterall. David
Lifetime MemberModerator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
The A/C cars work differently than the non-A/C cars. Gary says it correctly...the air door on the pass side kick panel should open on Max A/C only, to recirculate the cooler inside air, and be closed any other time. The vent system on the A/C cars uses a different path from the cowl area. 
Joel Adams
C3VR Lifetime Member #56 
My Link 
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
Lifetime MemberModerator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
I have a PDF file on the '72 Chev HVAC systems, including Corvette, with wiring and vacuum diagrams, if you need it. It explains how the system is s'posed to work, and gives some troubleshooting info, too. It is a large file(for me) at over 3 mb, so if anyone wants a copy, make sure yer e-mail will accept it.
I also have access to the same info other year models.
I also have access to the same info other year models.
Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
Lifetime MemberModerator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
We'll give it a shot, Gary...
Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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corvette440hp
Lifetime MemberModerator
Duncanville, TX - USA
Joined: 11/8/2003
Posts: 20214
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
F4Gary said: Thanks man. Are you going to the Legends meeting this Sat?
Corvette Legends? Nope...we're no longer members with that club.
(We were founding members, tho)
Joel Adams
C3VR Lifetime Member #56
My Link
(click for Texas-sized view!) NCRS
"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
in Forum: C3 Cooling and Heating Systems
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