I've been chasing a no A/C and no blower problem. With no success.
Today I put the car in reverse hit the gas, and miracle of miracles freezing cold air and the blower works on all speeds!!!
I put the car back in drive and nothing... I repeated it several times and it was the same result over and over again.
Has anyone else had this problem? Did you find a fix?
Does anyone have any suggestions?
Vette(s): 1973 Orange Metallic Coupe (orig owner), L82, 4 spd (WR), PS, (A/C & PW (I installed from wrecked 73)), leather, AM/FM Stereo, ran with '65 FI unit earlier & will again some day.
The only two things electrical connected to the transmission that I can think of are the backup lights and the neutral safety switch. Since it does when switching from reverse to drive, I would suspect the backup light switch first.
By chance does anything else suddenly work while in reverse??.... do your gauges or dash lights work correctly? usually funny things like this is a grounding issue, but this is kinda weird.... gotta a link for 1979 wiring, which "should" be the same, doesn't always work that way, but usually they are same/similar unless some major change happens in manufacturing.
welcome, keep us posted... we like a good mystery around here... hopefully not a murder mystery..... but, i know the feeling of wanting to shoot one of these things and bury it out back in a shallow grave.... but ummm, you didn't hear that from me... ;)
StingrayJim NCM Lifetime Member #1936
Stingray's '76 StingrayJr's '78 Lil Red '94 (click each one to see a bigger version)
I would be looking for a bad engine mount that is allowing the engine to raise up somewhat in reverse, which can cause the wiring harness to move enough in some cases to either make or break contact in some circuits. The blower motor, and the A/C compressor circuits are completely separate....one should not effect the other. From the sound of it, you have a wiring issue in the harness on the passenger side of the engine compartment, or possibly in the fusebox pass-thru on the driver side, where the front engine and lighting harnesses connect to the fusebox. Sometimes just disconnecting and reconnecting this connector can fix all kinds of goofy problems like this.
____________________________________ 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 2001-2017, 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