What is necessary to convert a 1973 coupe with factory air to 134A? Will the R-4 compressor handle the change? The factory receiver / drier seems to have a valve to bypass the evaporator core, lines to core are warm, and return line to compressor is cold. Ecklers offers a A/C VIR conversion kit to eliminate the POA and TXV valves (I assume these are located in the receiver drier), will it operate with 134A? I have found kits for conversion, however all are offered for 1977 and later models. I reside in south Texas and A/C is almost a must! (There is probably 4 to 5 weeks I would not need it).
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Re: C-3 Air Conditioning
Willie:
The major difference between R134A and R12, is in their respective "latent heat of vaporization" values. As you may know, this is the heat given up during the change from liquid to vapor phase, and which results in a temperature drop. With this in mind, the conversion requires a different expansion valve/orifice size, to compensate for this difference. There is also an issue with compressor oil compatibility. The line valves must also be changed to accept R134A style fittings. I do not know of any other significant mods that must be done.
I would study the differences between your 1977 system, and the 1973 system in order to determine whether or not the '73 kit will be appropriate for your car.
Joe -
Re: C-3 Air Conditioning
Check out ID-USA.com for information on the conversion. This is the company that sells the kits to convert.Comment
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Re: C-3 Air Conditioning
I changed my 72 air over with a walmart convert kit. It contained the oil,r134a,and the adapter. It worked fine after that. I hardly ever use it though. EricComment
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