Engine Size: 242
Refrigerant Type: R12
Ambient Temp: 40f-110f
Country of Origin: United States
Gents and Ladies,
I have a 1993 Jeep Cherokee 4x4, with a 242 in-line 6. I tried several years ago to convert my a/c system over to a R134a, but I failed miserably. I would love to be steered in the right direction, from scratch, to making this conversion happen the RIGHT way and legal for the not-so-great state of California. I would love to be pointed toward the parts needed, any industry documents specific to this process, and would love to know if there are specific steps or parts needed for a 1993 Jeep Cherokee that is configured such as mine so I have a good working a/c system at the end. Most of my hoses have already been replaced during the engine rebuild that happened when I stop driving this rig 3-4 years ago. I also plan on replacing the a/c compressor regardless.
Thank you for all the help in advance and I look forward to the help!!!
'93 Jeep Cherokee Country 4x4
For the legal aspect try this link from the EPA
Industry documents specific to this process (sarcastic ha, ha, ha) will range from total system replacement to some magic in a can.
When R134a arrived, many OE's offered retrofit procedures that did not work out so well, but this was info written for older cars with no mandate to convert. So the OE's had little need or incentive to work on improving retrofit procedures, and just moved on. Today, OE engineers refer to it as "lessons learned from the refrigerant retrofit debacle of the 90's".
Chlorine atoms from the R12, remaining in the mineral oil, will react with PAG oil, less with POE oil. So, the best course of action is to remove (flush "clean and dry") all the mineral oil from the internal surfaces of any hard parts being re-used. Suitable for R134a use; the compressor, hoses, seals, filter/desiccant, orifice device, and service fittings should be upgraded. It will also need a high pressure cut out switch and safety relief valve. Condensers and fans will usually also need to be updated/upgraded. All this system redesign, will also require you to engineer and determine a new charge level for proper lubrication circulation and cooling performance.
Often best to just keep it R12.
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