I installed two valves and it helped alot but I still get some warm air in the corkpit with the heater off, cause with the ign switch on the fan motor still runs with the fan switch off, has something to do with the Astro ventalation set up ,so now what I do during the summer is close the valves and disconect the fan ground lead so that the fan doesn't run, I don't run my AC cause it throws compressor oil, even when I replaced the seal, long ago I read somewhere here that you could disconnect a brown wirer I believe at the AC blower motor cut out relay or blower motor risistor I can't remember or find it again, but it kills the the low speed on the blower motor but it still allows med and high to work, I'd post photos of my valve set up but don't have a clue on how to do it anips2009-06-23 18:50:19
Vette(s): 1977 T-Top,350,Auto Black Ruby Pearl,Steeroids R&P conversion
Just for info sake I went to napa this morning to get my brake rotors (another project) the parts guy found me avacum of control vale that is for 3/4 in hose. so I had him order it for me and I will install and see how it works.
Vette(s): 71 Colonnade Hardtop Coupe
Torch Red with black interior
originally L48 built to push around 360hp
I totally agree with Joel. If you want to shut off heat, ya might as well do it completly with bypass connector. With my 71 its easy, as the heater hoses are right behind the side grill. You can get hose reducers, 5/8" to 3/4" at any auto store. I know because I order them 2 doz. at a time. As far as vacuum control valves, iffin they worked you wouldn't have this problem in the first place. With manual valves your only gonna shut off part of the heat, not all of it as previously mentioned.
Corvette is a registered trademark of the General Motors Corporation(GM) &
Chevrolet Motor Division. Vette Registries, LLC is responsible for all site content (except for member submitted content or where otherwise
noted) and does not claim or imply that Chevrolet or
GM is responsible for Official C3 Vette Registry content. Vette Registries, LLC is independent from GM and is not affiliated
with, sponsored or supported by GM. Copyright/trademark/sales mark
infringements are not intended, or implied and are in fact used to support
GM, Chevrolet and Corvette.
Official C3 Vette Registry content is Copyright 2001-2018, Vette Registries, LLC. Content may not be reused without written consent. All Rights Reserved. NS
Corvette (Vette) Model Years on this site: 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982