You have an expansion valve that regulates low side pressure and temperature, thus no need for a clutch cycling switch. Low side clutch cycling switch is necessary with a CCOT system.(Clutch Cycling Orifice Tube).
You do need, and probably already have, a high-pressure compressor cut-off switch normally mounted on the receiver/drier.

The RV2 contains the oil to lubricate the compressor in the crankcase of the compressor; just like the gas engine under the hood. There's a drain plug on the bottom of the compressor oil pan for changing the oil and there's a pipe plug on the side of the compressor that gets removed so you can use an RV2 oil dipstick to measure the oil level. The oil, whether it be mineral, PAG or Ester, does not circulate with the refrigerant in an RV2/R-12 system like a rotary/134a compressor system, regardless of the refrigerant you choose to use.

Keep this in mind: The receiver/drier that is meant for an R12 system is usually not designed to retain and meter oil like a receiver/drier that is meant for a 134a system and a later style compressor.

Any of the three oils should work on the RV2 as long as you add it to the crankcase of the compressor and NOT the charging port. THE OIL DOES NOT MIX AND CIRCULATE WITH THE REFRIGERANT with an RV2 or York/Tecumseh.. Personally I would simply use mineral oil just like the factory did. The RV2 compressor has two roller bearings, a dinky crankshaft, two connecting rods and two pistons with rings. The crankshaft gets lubricated through a scoop/slash system.


The front seal is pretty easy to replace. It's typically retained by 4 small screws. No special tools required.