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01-13-2013, 05:47 PM
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#1
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Senior Member
Join Date: Dec 2012
Posts: 266
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R12 to R134 Conversion
I have a 1988 Class C on Ford 460 Chassis and has R12 refrigerant I would like to convert it to R134 Or?. Any suggestions from those that have done this will be greatly appreciated
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01-13-2013, 06:17 PM
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#2
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Moderator Emeritus
Ford Super Duty Owner
Join Date: Aug 2000
Location: Bryan, TX when not traveling.
Posts: 22,948
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R134a conversion often requires replacing, o-rings and some times hoses. You will need to flush the oil from the system and recharge to system with an oil that is compatible with R134a.
For a system like yours, you can leave the hoses, oil and o-rings alone and replace the refrigerant with a blend like Hot Shot (trade name). The auto shops like to do the conversion to R-134a so they can make more money. Some shops will try to short cut the proper procedure which usually winds up in a problem.
With the blend, you need to evacuate the system to get all of the R-12 out and then recharge with Hot Shot.
ICOR International, Inc.
Ken
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Amateur Radio Operator (KE5DFR)|No Longer Full-Time! - 2023 Cougar 22MLS toted by 2022 F150, 3.5L EcoBoost Tow Max FX4 Lariat Travel with one Standard Schnauzer and one small Timneh African Gray Parrot, retired mechanical engineer
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01-13-2013, 07:30 PM
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#3
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Senior Member
Monaco Owners Club Workhorse Chassis Owner
Join Date: Aug 2002
Location: Clovis, CA, USA
Posts: 13,140
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I had mine converted during a trip on a 1991 Miata in San Antonio, Texas that specialized in auto A/C.
The original system had leaks and they went through and replaced various lines and rings, etc and set it up for R134.
It was about $150 as I recall and the best money I ever spent as it was 100 degree weather that whole trip.
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01-14-2013, 05:20 AM
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#4
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Senior Member
Join Date: Sep 2007
Location: texas
Posts: 2,422
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Or look at R12A available here south of ft worth for $13 a can
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01-14-2013, 07:51 AM
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#5
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Senior Member
Join Date: Feb 2011
Location: Oregon
Posts: 252
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The other alternative is to just buy R12 - price has dropped.
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01-14-2013, 11:40 AM
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#6
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Member
Join Date: Jul 2010
Location: Thomasville, NC
Posts: 46
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Chase L: I have a 1990 class C Rockwood motor home also with a 460.
The chassis air conditioning on mine leaks down about 3 or 4 ounces over the winter. The result is in the spring my AC will blow cool not cold air.
There is a lot of information pertaining to the changeover from r12 to r134a floating around. I am sure someone smarter than I has assimilated all the information and has decided for themselves how best to tackle the issue.
I chose to order a product called "Envir O safe" from an eBay vendor. $35.00 for 4, six ounce cans with free shipping. This is a r12 and r134a replacement with a dye to help locate a leak.
It has worked for me for the past three years, just not used enough to get the dye content high enough to find the leak.
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Ron
A wonderful Wife
Two children and 7 grand kids 1997 Four Winds Class C M-31QSB V-10
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01-14-2013, 02:33 PM
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#7
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Senior Member
Damon Owners Club Freightliner Owners Club
Join Date: Mar 2006
Location: North East Texas
Posts: 4,946
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in 1996 i switched my 1992 f250 r12 system to r134
i used interdynamics kit
it was not a hard process, but the system has to be leak free and 100% operational before you start
it was a complete kit
except the system had a chemical you added after it was purged and vacuumed down that protected the o-rings
if your system has VITON rings already you dont need to change them out
being you have a 1990, its doubtful your o rings are compatible
but if they are....it was under 100 dollars to do the refit
plus the rental of a vacuum pump to purge the system
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