Help with A/C system
Thread Starter
Melting Slicks
Joined: Aug 2010
Posts: 2,487
Likes: 10
From: Palm Beach Florida
St. Jude Donor '12
Hey Dave. Have you put gauges on the system to see what the pressures are running? My late model '77 does not have VIR. I do not know when they changed over. I believe VIR has a dryer under the pass. fender that can be taken apart. Mine has a welded shut dryer. Post a pic. of yours. mike...
Race Director
Joined: Sep 1999
Posts: 11,360
Likes: 382
From: Plano TX
Electric fan(s) help, but are no substitute for a parallel flow condenser.
Here's what mine looks like. I welded on the tabs and used wiper motor bushings to mount it. I local HVAC shop made the fittings.
Here's what mine looks like. I welded on the tabs and used wiper motor bushings to mount it. I local HVAC shop made the fittings.
Last edited by zwede; May 11, 2011 at 06:50 PM.
Thread Starter
Melting Slicks
Joined: Aug 2010
Posts: 2,487
Likes: 10
From: Palm Beach Florida
St. Jude Donor '12
I think i'll go the new condensor route. I've been looking and they go for 80-120 bucks. I just need to find the correct size and one with the connections on one side like our originals. As for brackets thats not a concern. I can always fabricate somthing to make it work. My main issue is the connections. Are they all the same size? Or are some smaller/larger? I'd like to find one that I can unscrew from mine and tighten on to a new one with out any hassle.
Race Director
Joined: Mar 2006
Posts: 14,112
Likes: 28
From: Florida
No matter what other mods you do if using 134 you have to adjust the poa.
Refrigerant pressure from the poa = evaporator temperature. You want it at 33° (as cold as possible without freezing)
Different pressures for different refrigerants.
Refrigerant pressure from the poa = evaporator temperature. You want it at 33° (as cold as possible without freezing)
Different pressures for different refrigerants.
Thread Starter
Melting Slicks
Joined: Aug 2010
Posts: 2,487
Likes: 10
From: Palm Beach Florida
St. Jude Donor '12
I have a VIR, that can not be adjusted. It is for the r134.. I wish my 77 did have a poa.
Race Director
Joined: Mar 2006
Posts: 14,112
Likes: 28
From: Florida
Most will tell that it's not adjustable, not much call for it and more profitable to sell eliminator kit, but I'll see if I can find the instructions.
VIR is definitely the one to consider staying with 12
Thread Starter
Melting Slicks
Joined: Aug 2010
Posts: 2,487
Likes: 10
From: Palm Beach Florida
St. Jude Donor '12
Are you saying that maybe there is an adjustment that can be made on the VIR? The only way I knew of, was to get two, cut one open and take the so-called pin out, and adjust it and replace it into the other VIR.
Le Mans Master
Joined: Aug 2001
Posts: 7,804
Likes: 4
From: Standing still with all my might Texas
Cruise-In X Veteran
St. Jude Donor '09-'11
You can buy a rebuild kit that comes with a new desiccant bag and new o-rings. The last time I had mine apart I adjusted it (per instructions I found on a A/C forum) for 134a. This time I am installing a eliminator kit though.
It appears that the VIR was used on C3's from 73 through early 77.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
Le Mans Master
Joined: Aug 2001
Posts: 7,804
Likes: 4
From: Standing still with all my might Texas
Cruise-In X Veteran
St. Jude Donor '09-'11
Le Mans Master
Joined: Aug 2001
Posts: 7,804
Likes: 4
From: Standing still with all my might Texas
Cruise-In X Veteran
St. Jude Donor '09-'11
