converting r12 to 134a -

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post #1 of 5 Old 07-10-2006, 09:13 PM Thread Starter
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converting r12 to 134a

Hey all, Just charged my wife's 94 jeep cherokee with 134a. Works great and was so easy.

Bought the fittings kit and two extra bottles of the 134a. Want to convert my 91 jeep.

I understand that I have to let out any r12 that may be in there.

How do I do that with out taking it to a pro?

Has anyone done this before?

Does it work well?

What steps need to be taken?

I figure I will remove the r12 if there is any left. Then fill with the 134.

Would love to hear from anyone who has any experiance with this before I do this.

If it won't work I would rather just return the two cans of 134a.



1991 Jeep Cheorkee 'Cancer' *retired Oct'06
1994 Jeep Cherokee Country
4.0 H.O. Auto 2 wd
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post #2 of 5 Old 07-10-2006, 10:02 PM
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YOU cant. it's illegal and you could be fined by the EPA if you do...however, there's an easy way to let it all out. once you have the adapters on, just hook up a hose with no can on and turn the piercing pin.

you'll still need to take it to a pro though...they have special oil that goes in to make sure the new stuff is compatible. and you'll need to replace some seals. other than's easy

remove the two (high and low) sides of the compressor, fill with the special oil. connecto new pieces on the ends (after you put them back on), replace the seals on the high side and low side of the compressor. vac the system with a special vacuum and make sure it holds...fill with the new stuff.
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post #3 of 5 Old 07-10-2006, 10:07 PM
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i just charged my buddies 89xj about 4 weeks ago with 134. it still had r-12 in it. just threw it on top. got the air down to 35 deg in the vent.
i know, you can't do this, but the jeep did'nt seem to care.

89 XJ
72 commando
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post #4 of 5 Old 07-10-2006, 10:22 PM
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I talked to a mechanic once, maybe he is out of his mind... But he had a specialization in AC. He said I could just put in the 134a in on top of the R12. What he said was, the 134a gas won't carry the R12 oil. So what happens is the oil from the r12 sits around in the compressor oiling it. What he also said I needed to do was buy R134a charges with the ester oil in the can... Or buy a seperate ester oil charge. This is what I did and it's worked for months, even through summer in florida, where I am and it's still kickin like brand new. No seals, no draining, none of that.

Good luck.
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post #5 of 5 Old 07-11-2006, 08:46 PM
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yeah...the special oil stuff. it makes 134 work with 12. if you dont use it you'll fry your compressor.
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