I have a 92SC that was originally set up for R12. I have since converted it to R134 simply be changing the charging connectors and adding the 134 (no comments please). All worked well except over the winter, I would lose some charge that required more refrigerant. This year, I decided to convert to a hydrocarbon refrigerant due to larger molecules and increased efficiency.
I have since had trouble with cooling at low RPM. The directions stated to charge at 40psi low side at idle. Since I couldn't get proper cooling at idle, I decided to charge at 2000RPM and see what happened. I got about 30psi low side and 250psi high side. This still gave me very poor cooling in town. At highway speeds, it will freeze you out of the car. The refrigerant supplier insisted that I start over again (releasing all the refrigerant) and charge to 40psi low side at idle. This gave me only 150psi high side and 70degree vent temperature with 85degree ambiant. The car still cools pretty good at highway speed.
My local a/c guy says either my compressor is going or the orifice is stopped up. Without getting into the hydrocarbon refrigerant debate (It is being used in Europe), what is the consensus of opinion here? Do I need to pop for a new compressor?
I have since had trouble with cooling at low RPM. The directions stated to charge at 40psi low side at idle. Since I couldn't get proper cooling at idle, I decided to charge at 2000RPM and see what happened. I got about 30psi low side and 250psi high side. This still gave me very poor cooling in town. At highway speeds, it will freeze you out of the car. The refrigerant supplier insisted that I start over again (releasing all the refrigerant) and charge to 40psi low side at idle. This gave me only 150psi high side and 70degree vent temperature with 85degree ambiant. The car still cools pretty good at highway speed.
My local a/c guy says either my compressor is going or the orifice is stopped up. Without getting into the hydrocarbon refrigerant debate (It is being used in Europe), what is the consensus of opinion here? Do I need to pop for a new compressor?