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L
Former Member
Send PMFallon, NV - USA
Joined: 7/25/2007
Posts: 43
Vette(s): 1978 Coupe, Red w/black leather interior, L48, Auto, A/C, Power Windows, Cruise, Tilt/Tele.
I had the same problem until discovering the heater hose vacuum switch was corroded and leaking. I replaced it with a manual cut off, leaving it in the off position, and from that time on the A/C has been awesome.
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Get a piece of 3" thick foam rubber, cut so it's a little larger than the duct opening (by your right foot) and shove it into the vent, when you want heat pull it out. It stops that source of heat. But you need those shut off valves on both hoses for sure.
DaveM 2008-07-11 23:49:38
On my '82 the stock shut off valve only works when the AC is turned on, not sure about other years.
Dave
Lifetime Member #116
Dave's '82 
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w
Lifetime Member
Send PMMundelein, IL - USA
Joined: 6/9/2008
Posts: 411
Vette(s): 1978 25 anniversary blue on blue with T-tops.
[QUOTE=dwright]...
Just be thankful you don't have the 454 engine.
[/QUOTE]
You know that heat can be dealt with for the increase in power
Lifetime Member #150
Recent Modifications 
"Drive it like you stole it"
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in Forum: C3 Electrical, Body and Interior
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