A/C conversion
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Pro
Joined: Jun 2005
Posts: 552
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From: Waynesboro GA
A/C conversion
Can anyone tell me the proper way to convert my 81 to R-134. Have heard all types of methods and tales. It currently has R-134, but I think the previous owner must have missed something. It cools but not good. Help!
Race Director
Joined: Sep 1999
Posts: 11,358
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From: Plano TX
If you don't have an adjustable cycling switch you need to get one. You need to cycle at a lower pressure w/ R134a.
Also replace the stock orifice tube with a "smart VOV" (google for it). With those two changes, and if the rest is in good stock consition, your vent temps should be in the lower 40's even on a hot day. You can get an AC thermometer at any parts store for $5 or so to verify.
Also replace the stock orifice tube with a "smart VOV" (google for it). With those two changes, and if the rest is in good stock consition, your vent temps should be in the lower 40's even on a hot day. You can get an AC thermometer at any parts store for $5 or so to verify.
Burning Brakes
Joined: Aug 2001
Posts: 1,060
Likes: 33
From: Eagleville PA
Originally Posted by zwede
If you don't have an adjustable cycling switch you need to get one. You need to cycle at a lower pressure w/ R134a.
Also replace the stock orifice tube with a "smart VOV" (google for it). With those two changes, and if the rest is in good stock consition, your vent temps should be in the lower 40's even on a hot day. You can get an AC thermometer at any parts store for $5 or so to verify.
Also replace the stock orifice tube with a "smart VOV" (google for it). With those two changes, and if the rest is in good stock consition, your vent temps should be in the lower 40's even on a hot day. You can get an AC thermometer at any parts store for $5 or so to verify.
I bought a kit a few years ago that basically just had some adapters for the hose fittings and a can of R134. Was that not enough?
Thanks!
NCM Grand Opening Veteran
Joined: Sep 2005
Posts: 20,979
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From: South of giving a damn
St. Jude Donor '11, '17
I hope you didn't just bleed off the R-12 & juice the system with R-134. The compressor oils are not compatable between R-12 & R-134. There are some oils & refridgerants that go both ways, but you specificly have to replace the original oil.
Instructor
Joined: May 2006
Posts: 168
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From: Florence NJ
Originally Posted by jlelec
Can anyone tell me the proper way to convert my 81 to R-134. Have heard all types of methods and tales. It currently has R-134, but I think the previous owner must have missed something. It cools but not good. Help!
Zip 134a Conversion Artical
Race Director
Joined: Sep 1999
Posts: 11,358
Likes: 379
From: Plano TX
Originally Posted by adamw1979
Could you expand on the "adjustable cylcing switch" part?
