85 interior air flow problem
Thread Starter
3rd Gear
Joined: Mar 2006
Posts: 3
Likes: 0
85 interior air flow problem
85 manual heater/AC controls, in any mode, heat-vent-defrost- equal amonts of air flow thru all vents , floor, defrost and vents, I pulled out control unit and all vac lines appear to be in place and none are cracked or brittle, is there a check valve anywhere that I am missing like on the newer C4's?
Thread Starter
3rd Gear
Joined: Mar 2006
Posts: 3
Likes: 0
85 manual heater/AC controls, in any mode, heat-vent-defrost- equal amonts of air flow thru all vents , floor, defrost and vents, I pulled out control unit and all vac lines appear to be in place and none are cracked or brittle, is there a check valve anywhere that I am missing like on the newer C4's?
Race Director
Joined: Jun 1999
Posts: 14,924
Likes: 9
From: Merritt Ils Fl
The HVAC vacuum feed is at the right rear of the plenum, next to the vac source for the fuel pressure regulator. There should be a filter in the line.Make sure the hose is connected and the filter is not leaking.
Tech Contributor
Joined: Oct 2008
Posts: 3,729
Likes: 190
From: Custer, WI
Safety Car
Joined: Jan 2008
Posts: 3,939
Likes: 1
From: Vero Beach Florida
It's not really a filter its a T-vacuum style check valve you can pick them up any auto parts store top connection is feed line middle cruise control bottom AC. AC line is a small hard plastic one that runs in main loom behind motor, the valve should be drivers side of dizzy to find it follow the rear vac line off passenger side of plenum. there was a photo of one on here about a week ago. Here is the link with photo
http://forums.corvetteforum.com/c4-t...cuum-line.html
http://forums.corvetteforum.com/c4-t...cuum-line.html
Last edited by floridamale; Aug 28, 2009 at 06:30 AM.
Race Director
Joined: Jun 1999
Posts: 14,924
Likes: 9
From: Merritt Ils Fl
Not sure what my Florida friend is talking about but this is what I have in the HVAC body feed.
http://www.ecklers.com/product.asp?p...8&dept_id=1326
http://www.ecklers.com/product.asp?p...8&dept_id=1326
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Team Owner
Joined: Jan 2003
Posts: 20,316
Likes: 246
From: Summerland B.C. Canada
Not sure what my Florida friend is talking about but this is what I have in the HVAC body feed.
http://www.ecklers.com/product.asp?p...8&dept_id=1326
http://www.ecklers.com/product.asp?p...8&dept_id=1326
