A/C Help needed

[Pstyckiewicz]

I have an M1152A1 with the 2 wire compressor. I noticed that the A/C is not working. The fan runs fine but no cold air. I looked at the clutch on the pulley and it’s not engaging. I attempted to test the voltage to the compressor but I didn’t yield any result. Also let it be know I have no idea what I’m doing testing wires or how my tester even works. Mechanical inclined but wiring I’m lost. Not sure if the A/C/heat switch is working either. I haven’t ran the truck long enough to tell if the air is getting warm. I opened up the gauge cluster and everything appears to be connected behind there. Any advice where to start would be greatly appreciated!

A/C model RCSK1756-7

 

[Retiredwarhorses]

Well, your fans should not run unless your compressor is running…so some is seriously off.

 

[NDT]

What pressure do you have in the system? If your refrigerant has leaked out, pressure switches will prevent the compressor from coming on.

 

[Pstyckiewicz]

Did not test the pressure yet. It’s an auction truck so it been sitting probably forever. My guess is no pressure. I’ll test it and let you know what I find out.

 

[springer1981]

I would recommend taking it to someone that does AC work. It's not hard to work on but you should really know what you are doing as the refrigerant is particularly bad for you.

 

[FlameRed]

I would recommend taking it to someone that does AC work. It's not hard to work on but you should really know what you are doing as the refrigerant is particularly bad for you.

and you really need a bunch of specialized (expensive) equipment, like GOOD gauges, vacuum pump, leak detector. and you really need a way of recovering refrigerant unless you like pissing off the greenies. Actually, the basics can be "borrowed" with a large deposit from AutoZone. But it is so easy to have insufficient pag oil, or over-charge. Besides, the cheapest you can get R134 is about $10/can and mine took just under four cans so you don't want to waste the gold!