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Topic: Upper vs. Lower AC

in Forum: C3 Cooling and Heating Systems


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Upper vs. Lower AC

Posted: 5/17/07 3:53pm Message 1 of 6
jsgarner
Former Member
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Garner, NC - USA
Joined: 4/16/2007
Posts: 100
Vette(s): 1982 , L98-350ci, T-Tops, Bright Metallic Blue with Dark Blue Interior
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

Posted: 5/17/07 4:19pm Message 2 of 6
ossw1
Former Member
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Rocklin, CA - USA
Joined: 4/2/2005
Posts: 484
Vette(s): 1970 T-Top350/350hp numbers matching 4 speed. It's a mess and 1970 Convertible 4 speed.
Hey I think the upper are for the AC only.


Upper vs. Lower AC

Posted: 5/17/07 4:28pm Message 3 of 6
jsgarner
Former Member
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Garner, NC - USA
Joined: 4/16/2007
Posts: 100
Vette(s): 1982 , L98-350ci, T-Tops, Bright Metallic Blue with Dark Blue Interior

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




Upper vs. Lower AC

Posted: 5/17/07 5:55pm Message 4 of 6
ranger3
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North Charleston, SC - USA
Joined: 3/20/2004
Posts: 4176
Vette(s): 1975 L48 AT AC T-top
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

Posted: 5/17/07 5:59pm Message 5 of 6
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Adams' Apple
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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
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.


Joel Adams
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Upper vs. Lower AC

Posted: 5/17/07 7:22pm Message 6 of 6
jsgarner
Former Member
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Garner, NC - USA
Joined: 4/16/2007
Posts: 100
Vette(s): 1982 , L98-350ci, T-Tops, Bright Metallic Blue with Dark Blue Interior
Good advice!  I'll do just that!
Thanks folks!



in Forum: C3 Cooling and Heating Systems


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