Air conditioning Compressor issue

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rks213

New Member
Hello I have a 71 3500 Nada Rover that I am trying to get the A/C up and running before summer hits.
Currently I do have the system running using the original York compressor with r12. The issue I am having is that on the blower fan speed, when its on low the compressor turn on and everything is working, but once I set the fan speed to medium or high the compressor shuts off.

Right now I believe the issue may be with the compressor or the thermostat, but wanted to know if someone else had a similar issue before.

Thank you
 
That suggests the problem is with the blower switch. Is it a double pole switch, one for fan speed and one for the compressor feed? Or possibly there may be a relay for the comp feed. Try testing with a light bulb to see where there is or is not power.
 
Am guessing that the wires to the diverter-switch are scrambled. See attached (two pages). I'll mention that there is a standard York to rotary compressor adapter that is available from companies like Vintage Air. Much more efficient and smooth.
 

Attachments

Jack Shotton said:
Am guessing that the wires to the diverter-switch are scrambled. See attached (two pages). I'll mention that there is a standard York to rotary compressor adapter that is available from companies like Vintage Air. Much more efficient and smooth.
Click to expand...
Thank you for the diagram, that was exactly it. My scanned copy didn't have it numbered, 4 and 5 where switched around on the diverter. Now a/c is working on all speeds. This is the first time I am working with a york compressor, I heard the stories but now I see how much power it takes when its on! A compressor swap will be the next step, though I do plan to keep it as R12.
 
You can still buy R12? A change to Hychill minus30 will also reduce your power consumption and give better performance. there is also a shim behind the compressor side front wheel spring to compensate for the compressors weight. You may find a change in compressor will cause front of car to not sit flat if the new unit is significantly lighter.
 
I would be tempted to leave the York compressor with its R12 charge alone if it's blowing cold. My car has a rotary compressor and R134a. Blows cold, no problem.

However, on a return trip from highly recommended RoveAmerica, Massachusetts to Minnesota, the plastic behind fuse 23-24 melted. I recommend preemptively running a wire through an in-line fuse directly from the battery or alternator to terminal 17 of the relay on the left side of the console. I'd also put a diode between the compressor clutch and ground. This may already be built into the clutch or relay, but I'm not sure.
 
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