Howdy, I'm retrofitting my Riviera with both a late model Grand National drivetrain and converting it over to R134a. Is the pressure sensor on the hardline calibrated differently for R134a or will I get ineffective cooling using the old sensor since the threads on the later model sensor are different and I can't locate an adapter. Thanks,
The GN is a clutch-cycling type of system, the pressure switch controls the on-off cycling. It is adjustable with a little set screw on the switch. Your Riv shold use a STV and POA with a constantly-running compressor. It has a switch that is only used to cut-off the compressor when the pressure falls too low due to low refrigerant. I'm not clear on which parts you want to keep/swap. That would help.
The STV has an eliminator kit on it to convert it to the pressure cycling setup from Year One. The engine, compressor, and hardlines are all from the Grand National. The condensor is an aftermarket kit and I have not deterimined the drier I'll be using. The evaporator, STV with eliminator kit and the control head are all off of the Riviera. The complicating thing is that the compressor is controled by the ECM which is off of a 1998 Regal GS. I need to match the sensors to that ECM which is designed for R134a.
compressor should be ran w/ 12volts to coil to turn on and off maybe try running the power through a low pressure switch on the low side of the system (i think this is how i'm understanding your setup) the psi on the sensor for r12 and r134a are the same no issues there it just turns off the power to the compressor when psi gets low(cold system or out of freon) some r134a systems use a high psi switch to turn off incase of excessive high psi hmmm did i answer your question i think i confused myself and i knew what i was trying to say lol
2 sensors, a small red 2 wire plug on the back of the compressor which I am pretty sure is the high pressure sensor and a 3 wire screw on sensor on the hardline that I'm equally sure is the Low pressure switch. If they are the same I'll just splice a weatherpack connector onto the harness and call it good.
The GN low pressure cutout switch has an adjustment screw. You will need to adjust it lower for better performance with 134.
Where is it located? Is it in the sensor after I take it off or is it in the hardline? What kind of adjustment do I need to make?
It's on the switch. Take off the connector and you will see a little set screw in between the terminals.
ah... in the middle weatherpak well. That explains the need for a 3 wire connector with only the outer 2 wires. Do I just adjust it till its cold or do I need to put a gauge on it?
