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
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Team Owner
Joined: Jan 2003
Posts: 20,292
Likes: 239
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
