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Topic: Upper vs. Lower AC

in Forum: C3 Cooling and Heating Systems


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Upper vs. Lower AC (1/6)
 5/17/07 6:53pm
jsgarner
Former Member

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Garner, NC - USA

Vette(s):
1982 , L98-350ci, T-Tops, Bright Metallic Blue with Dark Blue Interior


Joined: 4/16/2007
Posts: 100

Hey Folks,
What would cause air flow to only come out through the lower ac ducts (at driver's right leg...passenger's left leg) of my '82 and not through the upper dash/console vents?  I checked that the ducts were connected/attached correctly.  What else should I investigate?
Thanks!
Jeff
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Upper vs. Lower AC (2/6)
 5/17/07 7:19pm
ossw1
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Rocklin, CA - USA

Vette(s):
1970 T-Top350/350hp numbers matching 4 speed. It's a mess and 1970 Convertible 4 speed.


Joined: 4/2/2005
Posts: 484

Hey I think the upper are for the AC only.
Upper vs. Lower AC (3/6)
 5/17/07 7:28pm
jsgarner
Former Member

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Garner, NC - USA

Vette(s):
1982 , L98-350ci, T-Tops, Bright Metallic Blue with Dark Blue Interior


Joined: 4/16/2007
Posts: 100

Nothing's coming through whether vent, AC, heat, etc...

Upper vs. Lower AC (4/6)
 5/17/07 8:55pm
ranger3Lifetime Member
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North Charleston, SC - USA

Vette(s):
1975 L48 AT AC T-top


Joined: 3/20/2004
Posts: 4176

My 75 has a lever below the mid-vents to open and close the duct. Pulled aft it shuts the flow off, pushed forward it allows the air to flow into the cabin. I'm not sure about your 82.

Scott
Upper vs. Lower AC (5/6)
 5/17/07 8:59pm
Adams' AppleLifetime Member
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Duncanville, TX - USA

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


Joined: 11/8/2003
Posts: 20126

Jeff, you could have a vacuum problem, or even a broken/damaged cable that operates the "mode" door for the air system. Your car uses a vacuum switching device to change the door positions, and they can/will fail. It is part of the HVAC control in the center console. You may try taking the control panel out of the console, and checking the connections on it.

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Upper vs. Lower AC (6/6)
 5/17/07 10:22pm
jsgarner
Former Member

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Garner, NC - USA

Vette(s):
1982 , L98-350ci, T-Tops, Bright Metallic Blue with Dark Blue Interior


Joined: 4/16/2007
Posts: 100

Good advice!  I'll do just that!
Thanks folks!
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