I'm not sure what to call it.....but in the area below the windshield, where the fan intake and exhaust screens are.......this area in question; my passenger side blows air when the blower is on so I assume this is excess air exhaust, the driver side must be intake? I guess my question is should it blow air our when the blower fan is on? I would just as soon have any excess air blowing inside the car as it seems my AC outlets blow a little weak compared to a new vehicle. Any thoughts?
Vette(s): 70 LT1 coupe, 69 350 HP coupe, 69 390HP 427 coupe, 71 LS5 convert, 85 coupe, 93 coupe
If I understand correctly, it sounds like your flaps inside the heater box might not be moving properly, or sealed properly. There are seal kits, and vacuum line kits for cars with AC. You might also have a vacuum actuator not functioning.
Thanks, I didn't know there were flaps inside. I can see the squirrel cage, after I got rid of the leaves, but I guess I need a vacuum diagram because there is a vacuum line in that area that disappears behind the passenger fender just in front of the door.
In a 1972 Vette...I took a blower fan from a 1993 Cadi with a larger cage and built a round (same pattern as the fan) 3/4" spacer (good sub box board, painted flat black) between the fan and the housing, you need to make the spacer or the fan cage will hit inside...this made a great improvement for the air flow. Other Gm fans will work, s10 blazer, trucks, Suburbans etc...make sure that the cage grills are cupped the same way and the fan direction is the same.
Vette(s): 1981 dark metallic blue, dark doeskin leather interior, mirrored glass T Tops, 330hp/350ci GMPP crate engine, billeted aluminum serpentine system, Dewitts with dual spalls
What do you mean by the spacer and box? I have often wondered about installing a different blower. My only complaint on my A/C is the volume. A buddy has a Blazer totaled out and I was thinking of taking the blower out of his Blazer and sticking it in the vette!
____________________________________ (click on either image to see a bigger version)
Take your blower motor out and compare it to the Blazer one see if the mounting/housing is the same and that the cage fins are cupped in the same direction...and MAKE sure that the motors go in the same direction. the spacer I mentioned goes between the motor and the heater box, to keep the motor about 3/4" out so that the cage doesn't bottom out, get some good press board and a jig saw and cut the shape of the blower motor housing where the motor mounts to the heater box, and then a round inside circle for the cage to go through...MAKE sure that nothing rubs or is to close.
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
acplus is right about using other GM blowers for Sharks. Most people have adapted the later, C4 blowers to use in Sharks, with the spacer, for the same reason. Waaay more air volume, as the squirrel cage is wider, and the fins on them are angled to provide more air volume, at the same blower speeds. The only issue is the cage is about 3/4" wider than the cages on a Shark, therefore you need some way to space the whole assy out a little.
____________________________________ Joel Adams C3VR Lifetime Member #56 My Link
Hey Fred, nice vette..I believe I have the sister vette...1972 Corvette convertible, 350, 4sp, black interior with black roof..was white roof, Bryar Blue exterior, I am about two weeks away from completion frame off resto. I would post some pics but I can seem to cut and paste...any help on posting pics???
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