I am looking for some help in converting a Freon AC to R-134A..? My compressor is bad and I thought this would be an opportunity to make the conversion. I'm looking for the parts & parts suppliers, as well as the basic process. However, I'm also interested in hearing your comments on just replacing the compressor and leaving it as is.. The 78 has 52K and is all original.. Thanks! Steve
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Re: AC Freon Conversion for 78 Vette
It is the ideal time to do the changeover. I do not recommend converting the 134 until you have a major component failure. I would install a new compressor, receiver/drier, and variable orifice tube. Get a changeover kit from your local Carquest, NAPA, etc. It will include oil and o rings. It is not necessary to change all the o-rings at this time, only the ones that you disturb. Be sure to lube those rings with compressor oil. You will need to take the car to a shop that has a vacuum pump to dehydrate the system. I recommend that you pump the system as long as you can, overnight preferrably. Charge the system to the recommended charge, remembering that you do not use as much 134 as you do R-12, I believe about 75-80% as much. R-134 is very critical as to the amount of charge, too little won't cool, too much won't cool. Watch the thermometer that you put into the rh interior duct. Add referigerant slowly. As it approaches the desired temp, add even slower until you reach it. Temp will vary according to ambient temp, but somewhere {45 deg would be a reasonable benchmark. Some systems will go lower even less than 40 deg, but most won'tDick Whittington -
Re: AC Freon Conversion for 78 Vette
If I may add....Since 134 runs at a different pressure than the original R12, ignore the pressure readings on the a/c gages and do exactly like Dick mentioned; watch the TEMPERATURE of the evaporator core only.Comment
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