Vette(s): Black 1979 L-82
Black 1996 LT1
Black 1999 Coupe
Joined: 3/20/2009
Posts: 452
Tony B said:
no matter what mode I select on the A/C / heat control on my 1990 everything blows out the defroster. Is there a diverter that needs to be replaced?
Check for vacuum lines for leaks, and the mech. that opens and closes the damper-doors that re-directs air from vent to defroster....it's free, and easy to check.
My 96 did the same thing, I had to remove the air control module which is located under the dash above the gas pedal. I removed the box and found that the lines ran through a black rubber which had nipples which collapse after time. I purchased new lines and removed that black rubber piece totally and joined the new lines to the control module. After doing this my air blows out the vents on the dash when needed and the floor for heat. I was informed on another forum that the default setting is defroster. Mine works like a champ. Good luck it was a b>>>>h standing on my head and removing the unit from under the dash.
Vette(s): 1981 Red
1985 Silver Metallic
1988 Yellow
(2) 1994 Torch Red Coupe LT1
1996 Dark Purple Metallic LT4
2000 Torch Red
2001 Light Pewter
2003 Z06
2006 Magnetic Red
2009 Atomic Orange
Joined: 7/29/2011
Posts: 21
tloftus3 said:
My 96 did the same thing, I had to remove the air control module which is located under the dash above the gas pedal. I removed the box and found that the lines ran through a black rubber which had nipples which collapse after time. I purchased new lines and removed that black rubber piece totally and joined the new lines to the control module. After doing this my air blows out the vents on the dash when needed and the floor for heat. I was informed on another forum that the default setting is defroster. Mine works like a champ. Good luck it was a b>>>>h standing on my head and removing the unit from under the dash.
Correct on everything...defroster default is pretty much standard on most vehicles if there's an issue with the A/C system.
Also, spend 15-20 minutes to remove the drivers seat first, makes it much easier to recline and work under that dash.
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 C4 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 C4 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: 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996
30
C4 Corvette Parts Auctions
