ccorvetteracing

I am thinking about converting my 92 vettes ac from R-12 to R-134. What all do you have to do to convert it? Thanks

Flame Red

First, if you have no problems I would not convert! Keep your R12 till it escapes or you have problems with it and need to open it up.

You need to rent (or buy) a AC vacuum pump, and a decent set of AC gauges and buy an R134 conversion kit. It contains the R134 cans, ester, and conversion fittings.

First, fix whatever problems caused you to loose your R12. It is a highly recommended that you replace the receiver dryer with a fresh one.

First, I would say if you have no problems I would not convert! Keep your R12 until you loose it.

Install the new dryer. This is the best time to add the needed amount of new oil. Install the conversion fittings. Let the vacuum pump draw the system down for a while. Then let it sit and make sure there are no leaks (air gets in). Start the engine and you will need to short out the low pressure switch to engage the compressor. Let it draw in the correct amount of ester oil and R134 until the low pressure gauge says it is full.

The key is to make sure you put in the correct amount of ester oil, and the right amount of R134. Too much or too little of either and you can have failures.

Muffin

What Red said. If your system is sound and simply needs a boost stay with R12.

engle1147

most people do the switch once they have a major component failure. Rent, buy or borrow the tools. As mentioned at a minimum you'd need a new dryer/accumulator, oriface tube, "o" ring set and a compliant 134a ester oil. A complete system "flush" is the best way to go as old pag oil will/would not really be compatible with the new stuff.