95 T800 A/C question

I have a 95 T800 with an N14 that is only used seasonally. I should’ve checked the A/C over the winter but didn’t and it’s not working now. I put gauges on it and there was no pressure. Obviously I should’ve hooked a vacuum pump up but I tried to add some refrigerant to see if the pump would kick on.

Not only did the pump not kick on but it also didn’t have power going to the clutch.

The truck had to leave and I didn’t have time to keep messing with it but it’s the wife driving so I need to get it figured out. The truck is about 2 hours from me so I’ll probably be making a trip up there to see what I can do once I get a chance. I’ll take my vacuum pump to see if it holds some vacuum. Obviously it has a leak of some sort but I’m hoping it’s slow enough to get us through the season. I’ve done some A/C work on cars but I’m not an expert.

I looked for a fuse in the kick panel under the dash but didn’t see one labeled “A/C”. Is it going to be an accessory fuse or am I looking in the wrong place? Also, I’m guessing there’s a relay somewhere?

I noticed two switches/sensors on the high side line. I’m assuming one is a high pressure cut-off for the compressor and the other is a switch for the fan? Is there a low pressure switch somewhere, I looked but didn’t see anything?

If I provide power to the single wire on the compressor, it should kick on, right? The compressor is only 4(ish) years old but the truck only runs around 5k miles a year so it doesn’t have many miles on it.

Is the ECM involved with the A/C system at all? Is there anywhere to get an actual wiring diagram for this thing?

Thank you!

 

I just had the can hooked up to the low side through my gauge set. It was about 60° outside air temp so the low side gauge was reading around 60psi. Normally the pump would cycle and pull in refrigerant and then the high side would start showing a reading but the pump never cycled and wasn’t getting power.

 

Thanks. There’s two switches there and they both look like two wire switches. I’m assuming one is a high pressure cutout and the other is the switch for the fan clutch? I (hopefully) added a picture of the two switches.

I have a guage set with both high and low side. There was 60psi on the low side because that’s the side I opened to start charging the system. Maybe I should have opened both the high and low, got some refrigerant in both sides, closed the high side and then tried turning on the compressor?

Do you know of there is a low pressure switch somewhere or maybe the high pressure switch has a low end cutout as well?

Its a day cab. I was figuring around 3.5 so I was pretty close.

 

They will show pressure, if there’s any pressure to show. The system was empty which is why the HP side wasn’t showing anything and the LP side was just showing the pressure from the can I was charging from.

If that’s a low pressure cut off, I’m guessing that’s my problem. I’m surprised there’s a low pressure cut off on the High Pressure side though.