I experienced a loss of ac today. Just blew hot air, all of a sudden. I thought that perhaps I had a freon leak because compressor clutch was not activating. I hooked up a pressure gauge to low pressure side of compressor, and there was high pressure.
So, after checking /bypassing pressure switch, still no power to the compressor. Then, I disassembled the whole center dash and glovebox area to backtrack the power line. The fan/compressor activation switch had good power, checked the thermostat switch, good. Finally found the problem, the little copper contacts that touch each other, off of the max ac, ac, heat, bi level, defrost lever cam part inside the control assembly(called "micro switch" on the ac wiring diagram) were not quite touching. I cleaned off the points contact, slightly bent the copper tabs so they would touch again when the cam pushed them together.
Success! Now ac is working great again. When I bought the 83 eagle last week, the ac had not been working for years, according to previous owner. It still had the original r12, still had pressure in the lines, believe it or not. We drained the r12, blew out as much of the old oil we could, then put a r134 adapter nipple on the low pressure side, and filled with one large bottle of auto part store off the shelf refrigerant refill. Ac now blows out vents at about 36 degrees.
Topic: AC Thermostat Part # & Testing (Read 13584 times)