RobbieD
2.9l Mafia
- Joined
- Aug 6, 2007
- Messages
- 3,802
- Reaction score
- 3,308
- Points
- 113
- Location
- Georgia
- Vehicle Year
- 1984,1990,1994
- Make / Model
- Ford
- Transmission
- Manual
- 2WD / 4WD
- 2WD
- My credo
- Toonces drives a Ranger . . . . just not very well.
Agree with @19Walt93; it looks like the truck was born with factory AC and was "somewhat" repaired along the way with aftermarket parts (it's only been 37 years, right?).That's a factory looking evaporator case, I wonder if someone replaced a bunch of parts with non stock pieces. If the compressor isn't engaging the first thing to check is the fuses. As Ron said, the only power is to the compressor clutch so it shouldn't be too hard to trace 1 wire.
Including some factory diagrams in case it helps.
It's good to start on tracing the wire to the compressor clutch. If the AC switch lights and the blower works, the 30A fuse 9 should be OK. I suspect that the original pressure switch (which was on the original accumulator) was bypassed (i.e.- a jumper, or the plug was cut and the two wires spliced together). You should be able to trace, and restore the circuit to the compressor, and get the clutch to engage. If there's power there but no clutch, check the grounding side.
Get the compressor clutch to work, then take things from there.
Most aftermarket systems had the pressure switch on the accumulator / drier (like the factory system). On yours (your second pic) there's a threaded plug on the top, rear side, where a pressure switch can be added. There should also be a sight glass in that dimple on top of the drier; yours is either covered with grime or the black paint wasn't scraped off when it was installed.
Hope this helps; good luck!