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GM air conditioning: converting R12 to R134A

 
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Kelvin



Joined: 28 Nov 2005
Posts: 275
Location: Richfield, NC

PostPosted: Thu Jun 22, 2006 9:43 pm    Post subject: GM air conditioning: converting R12 to R134A Reply with quote

Been 20 years since I fooled with one and it seems like since the Gov't got involved there is a paucity of info on air conditioning for the public.

My question is: is the expansion valve for R134a the same as for R12? If not, will the R12 valve work with R134a even if not totally efficient?

Thanks!
Kelvin
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Jim Pelley



Joined: 02 Dec 2005
Posts: 8
Location: Wellsville,Ohio

PostPosted: Sat Jun 24, 2006 11:14 am    Post subject: expansion valve Reply with quote

Kelvin,
Yes, it will work fine. The biggest concerns when the switch from 12 to 134 came about were seals ,o-rings etc. due to the different oils used.(mineral oil vs. man made synthetic). At first they would have you believe that practically the whole system had to be reworked, however over time they have backed off when they discovered that most people would'nt spend the money. Although to be on the safe side I won't personally recommend it Wink I have pulled a vacuum on r-12 systems,pumped in the 134 and had no trouble.
JP
_________________
1955 ZBU, 1944 ZTU, 1961 M5 nf gas
Also 1956 Ford 640,195? A-C WD,1966 A-C B-10,and a couple old Cubs.
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Kelvin



Joined: 28 Nov 2005
Posts: 275
Location: Richfield, NC

PostPosted: Sat Jul 15, 2006 8:15 pm    Post subject: Reply with quote

Thank you Jim, I was thinking of trying it on my old truck.

Chevy dealer made me spend $1400+ when they converted my 85 chevy. (I really think they got too much stuff in the system and let the high side pressure got too high.) Couldn't take that kind of bill again.

Kelvin
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