1994 W900L AC Theromostat Switch

JimmyWells · Jul 7, 2017

No problem, I appreciate the input from everyone here. I just wanted to update it for those who may be searching for this information at a later date.

Kirkwood · Aug 16, 2023

JimmyWells said: ↑

Thanks for an awesome explanation. I reduced the amount of freon in the system and got the freezing to stop. The clutch started to run the compressor on it's own and the fan came on immediately with the clutch. The clutch never cycled on/off and the fan continued to run along with it nonstop. The vent temp got down to 38-40 degrees or so and it all cut off. I kept everything on and running hoping it would fire back up but it never did even after the vent temp reached 65 degrees. Pressures were around 30/200 but it's hard to read the gauges since they shake so bad. So when the clutch is engaged the low side should be around 40 and the high side should be around 175-200?

The reason I'm thinking it's the thermoswitch is because I'm jumping the two wires that go to the center two posts of the trinary switch labeled, "A/C Thermo" and "Override". By jumping those two wires I'm fooling the circuit into believing the thermoswitch is closed and allowing the compressor to run. Am I correct? I've attached a picture of the trinary switch and diagram.
Click to expand...

I got a 92 w900l and trying to find what color goes on which post on the

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