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1983 Mazda Rx7 R12 system.....need help

cmeseadoin on Tue May 12, 2009 12:15 PM User is offline

Year: 1983
Make: Mazda
Model: Rx-7
Refrigerant Type: R12

Hey guys,

A friend of mine just purchased an old 1983 Mazda Rx7 which was equipped with factory R12 air cond. The air obviously does not work, the previous owner does not know anything about it or what was done, so I am starting from scratch. What would be the first thing that you guys would do in order to get this system "back on the road?" I know that depends on if he is planning to convert from r12 to 134a and such......We know that the compressor clutch works and engages the compressor, it just obviously does not cool down because the R12 most likely leaked out 15 years ago, LOL. What are some opinions on what to do with system, I would certainly appreciate feedback. Is there anything to be said for that stuff they make called Freeze 12 or is that garbage that is not worth anything. Im thinking pull all components and flush really good to start with? Do you think the compressor is shot or maybe salvageable? Im looking for guidance...thanks!


JJM on Thu May 14, 2009 10:47 PM User is offline

Replace all the hoses, replace all the o-rings, flush the remainder of the system, replace the receiver dryer (XH-7 or 9), add the appropriate oil for R-12 or R-134a, and charge.


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cmeseadoin on Thu May 21, 2009 9:10 AM User is offline

Thanks for the information, I am going to recommend that my buddy do this to the car. Appreciate it!

mk378 on Thu May 21, 2009 10:09 AM User is offline

First check the static pressure, if you find all the R-12 is indeed gone (zero psi), there is a significant leak. Before taking anything apart you could inject a small amount of R-134a and conduct a leak test with the engine off. Do not run the compressor.

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