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1994 Toyota Pickup 4X4 with 275,000 miles, 22RE, 5 Speed Manual. Toyota trucks are the finest of machines. 5 years ago I added air conditioning since it is a factory non-AC truck. The AC has functioned decently for those 5 years. I had the AC system recharged since it had refrigerant leaking from one of the Schrader valves. Following this recharge the AC was blowing cold and the evaporator is creating a larger volume of water condensation. Recently I noticed condensation draining inside the cab onto the carpet beneath the glove box. I then got out my pancake air compressor and discharged 150 PSI air backwards up the evaporator box condensation drain pipe from outside the truck. Approximately one-half gallon of water drained from the evaporator box. Now the AC compressor clutch will not turn on at idle speed. The AC clutch does turn on just above idle speed and it still blows cold air. Blowing the water backwards into the evaporator box apparently caused some sort of setting change. Could it be the low pressure switch or its associated fuse? Could it also be the AC Amplifier itself or associated fuse busted?
Well, the A/C is "supposed" to turn off at a lower rpm (otherwise, it could stall the engine). The A/C amplifier has a control ominously labelled "rpm."
It is said that control adjusts the turn-off speed. I have a small collection of manuals for this vintage Toyota pickup, and none of those manuals make any reference to this control. You could try playing with it (and let us know your results if you do), but I will say that something that poorly documented might be the sort of thing that could break everything.
09-19-2024, 05:14 AM
