Vette(s): 1981 Charcoal Met., Silver Interior, Gymkhana Suspension, 27K original miles. It's my daily driver.
Joined: 8/27/2006
Posts: 71
Took the car out today for the first time since getting it 2 weeks ago. 1981, 27K original miles. When I looked at the car before purchasing, the heat and defroster vents wprked fine when moving control back and forth. today when I went to use the defroster it didn't blow out through the defroster vent but blew onto floor. After driving a few miles it finally started coming out through the correct vents. Is this just due to the fact of the low mileage and not much use or is there something else I should be looking for? This is only my second 81' and i'm still learning some of the little things about these cars. Thanks, Tom
Vette(s): 70 LT1 coupe, 69 350 HP coupe, 69 390HP 427 coupe, 71 LS5 convert, 85 coupe, 93 coupe
Joined: 5/24/2007
Posts: 1031
Low mileage cars tend to have a lot of things kind of sticky. If you drive it a bit and it frees up, great, but if not you might need to take things apart and clean and silicone the flaps and actuators. There is an A/C vacuum diagram available that might be of help. I remember finding it on the internet, but don't remember where.
Larry
____________________________________
Corvette Specialties is your best source for Corvette parts, accessories and gifts. www.CorvetteSpecialties.com
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: 19511
It's also possible the vacuum control switch has dried out over the years, and not allowing the vacuum to get to the appropriate servos to move the mode doors/flaps. Any small vacuum leak anywhere on the car will effect the operation of the HVAC system, too, so check around under the hood, and under the dash for any tell-tale hissing with the engine running, that would suggest a vac. leak.
As Larry says, it might just need some working out to get it all limbered back up, too. Hopefully, that's all it needs. Work it back and forth a few times to see if it improves.
____________________________________ Joel Adams C3VR Lifetime Member #56 My Link
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
30
Hopefully, that's all it needs. Work it back and forth a few times to see if it improves.
