AC Problem
Thread Starter
Pro
Joined: Jul 2013
Posts: 729
Likes: 64
From: Florida
AC Problem
Trying to get the ac up and running on my 73 changed the VIR piece that was leaking vacuumed the system and charged it up but when I turn it on it starts to blow cold then one of the lines at the ac box freezes and it blows warm.
Can anyone help
Pat
Can anyone help
Pat
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,851
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
In most cases with R12, when you freeze up you have too much freon in the system... But the valves in the VIR can't handle 134A (If you are running 134), you should contact Old Air Products about a replacement for the VIR. I talked to them a year ago and there are not valves available for the VIR's that will handle 134, but there is a solution.
Willcox
Melting Slicks
Joined: May 2002
Posts: 2,716
Likes: 121
From: Sulphur LA
St. Jude Donor '05-'06,'11,'13-'14,'16,'18,'19,'24, '25
Did you check for leaks (pull vacuum and then let is sit for a while to make sure it will hold)?
Freezing up can be caused by a few issues; low air flow across the evap coil, low charge, dirty coil to list a few.
Do you know how much freon was put in the system and what the pressures where when the line started freezing?
Neal
Freezing up can be caused by a few issues; low air flow across the evap coil, low charge, dirty coil to list a few.
Do you know how much freon was put in the system and what the pressures where when the line started freezing?
Neal
Thread Starter
Pro
Joined: Jul 2013
Posts: 729
Likes: 64
From: Florida
What freon did you use? If using 134, one issue is that the VIR internal valves are not receptive to 134A.
In most cases with R12, when you freeze up you have too much freon in the system... But the valves in the VIR can't handle 134A (If you are running 134), you should contact Old Air Products about a replacement for the VIR. I talked to them a year ago and there are not valves available for the VIR's that will handle 134, but there is a solution.
Willcox
In most cases with R12, when you freeze up you have too much freon in the system... But the valves in the VIR can't handle 134A (If you are running 134), you should contact Old Air Products about a replacement for the VIR. I talked to them a year ago and there are not valves available for the VIR's that will handle 134, but there is a solution.
Willcox
Thanks for your reply I know they put 134 in the system would that cause the line to freeze and if so if I found and used R12 would that correct the issue?
Also in your reply you stated that there are no valves available for the VIR for 134 but that there was a solution so what would the solution be
Pat
Thread Starter
Pro
Joined: Jul 2013
Posts: 729
Likes: 64
From: Florida
Did you check for leaks (pull vacuum and then let is sit for a while to make sure it will hold)?
Freezing up can be caused by a few issues; low air flow across the evap coil, low charge, dirty coil to list a few.
Do you know how much freon was put in the system and what the pressures where when the line started freezing?
Neal
Freezing up can be caused by a few issues; low air flow across the evap coil, low charge, dirty coil to list a few.
Do you know how much freon was put in the system and what the pressures where when the line started freezing?
Neal
Thanks for your reply
Originally the system was vacuumed down and the VIR valve was found to be leaking out the top. Replaced the VIR valve and the system was checked again and seemed to be fine charged it with Freon ( not sure how much ) and ran into this problem of the line freezing up. Not sure if it's because the VIR valve isn't compatible with 134 or if there is a clog or some other issue. Trying to use the original compressor so don't know if that's also an issue
Pat
Racer
Joined: Jan 2016
Posts: 290
Likes: 78
Did you replace the dryer? How long did you vacuum it for? Excess moisture in the system will cause the low side line out of the evaporator to freeze and freeze the valve. At a minimum it should have been vacuumed for 1/2 hour. But in reality that's not long enough to try and get as much moisture out as possible. I usually try and vac a system for at least an hour with the vac pump continuously running. As far as the dryer goes once the desiccant is saturated it's done. No amount of vacuuming will remove moisture from it. Rule of thumb to go by is if dryer is open to the atmosphere for more than an hour it needs to be replaced. Less time if humidity is high.
Melting Slicks
Joined: May 2002
Posts: 2,716
Likes: 121
From: Sulphur LA
St. Jude Donor '05-'06,'11,'13-'14,'16,'18,'19,'24, '25
The VIR should be OK with 134,
134 will deteriorate regular O-rings and rubber parts, if rebuilt with the correct material the VIR will be fine, mechanically the VIR will work with 137.
Does the VIR have a silver top and bottom housing or is it gold?
134 will deteriorate regular O-rings and rubber parts, if rebuilt with the correct material the VIR will be fine, mechanically the VIR will work with 137.
Does the VIR have a silver top and bottom housing or is it gold?
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,851
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
The valves in the VIR are not designed for the 134A Freon, and there are no new up-style replacements to make the change work properly. You can do a replacement that will work just fine and they sell it.
IMHO,
Willcox
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Melting Slicks
Joined: May 2002
Posts: 2,716
Likes: 121
From: Sulphur LA
St. Jude Donor '05-'06,'11,'13-'14,'16,'18,'19,'24, '25
I understand your experience was not good with the rebuilt VIR but when you say they are not designed for 134 what exactly does that mean?
r12 and 134a are very similar when it comes to how they perform within the AC system, with 134 being a little more efficient then 12.
134 did cause the old o-rings and rubber components to deteriorate but the new oils have all but stopped this issue.
So I'm very curious to learn what exactly your issues were, is it possible that the VIR that gave you issues was incorrectly rebuilt?
I'm not trying to argue just wanting to understand,
Neal
r12 and 134a are very similar when it comes to how they perform within the AC system, with 134 being a little more efficient then 12.
134 did cause the old o-rings and rubber components to deteriorate but the new oils have all but stopped this issue.
So I'm very curious to learn what exactly your issues were, is it possible that the VIR that gave you issues was incorrectly rebuilt?
I'm not trying to argue just wanting to understand,
Neal
Former Vendor
Joined: Aug 2006
Posts: 76,656
Likes: 1,851
From: Jeffersonville Indiana 812-288-7103
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
I understand your experience was not good with the rebuilt VIR but when you say they are not designed for 134 what exactly does that mean?
r12 and 134a are very similar when it comes to how they perform within the AC system, with 134 being a little more efficient then 12.
134 did cause the old o-rings and rubber components to deteriorate but the new oils have all but stopped this issue.
So I'm very curious to learn what exactly your issues were, is it possible that the VIR that gave you issues was incorrectly rebuilt?
I'm not trying to argue just wanting to understand,
Neal
r12 and 134a are very similar when it comes to how they perform within the AC system, with 134 being a little more efficient then 12.
134 did cause the old o-rings and rubber components to deteriorate but the new oils have all but stopped this issue.
So I'm very curious to learn what exactly your issues were, is it possible that the VIR that gave you issues was incorrectly rebuilt?
I'm not trying to argue just wanting to understand,
Neal
There is an issue with the valves in the VIR when 134 is applied.
The biggest issue is that I'm on vacation for three weeks in Maine but I have the paper work saved in my office. This is why I told the OP to contact Old Air. I don't have access to this from where I'm at until I return home.
But our issue with the 134 was the valves inside the VIR were sticking from the 134. If you need an answer faster give them a call, the fella that helped me out was more than knowledgeable on the issue.
When I get back I'll pull the info and PM it to you.
Ernie