air conditioner Compressor will not run

1995 NISSAN TRUCK
100,000 MILES • 2.2L • 4 CYL • 4WD • MANUAL
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GLENN KETCHUM
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The air conditioner compressor will not run unless I ground one of the wires where the low pressure switch connector. I have already replaced the LP switch and recharged the system with 1.75 lbs of Freon after replacing the LP switch.
May 10, 2016 at 4:08 PM
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SATURNTECH9
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So what are the high and low air conditioner pressures at idle?
May 11, 2016 at 12:28 PM
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GLENN KETCHUM
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the low side was 36 and the high was 180
May 15, 2016 at 1:05 PM
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SATURNTECH9
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The compressor has go be running with those pressures?
May 15, 2016 at 1:16 PM
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SATURNTECH9
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What are the pressures without the pressure switch jumped and the compressor off?
May 15, 2016 at 1:21 PM
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GLENN KETCHUM
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Without compressor running the High Side is 80 and the Low side is 115
Jun 23, 2016 at 3:04 PM
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JACOBANDNICKOLAS
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Something is blocked internally. The low shouldn't be that high in the off mode. Saturntech, what do you think, orifice tube?
Jun 23, 2016 at 7:48 PM
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SATURNTECH9
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Try following the trouble tree I posted for AC compressor not coming on and let me know where it leads you.
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Jun 23, 2016 at 10:08 PM
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GLENN KETCHUM
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Guys I got mixed up on the high on low side the low side is 80 and the high side is 115
Jun 25, 2016 at 6:28 AM
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GLENN KETCHUM
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Also remember that the ac cools very good - as long as you have the green wire with a red stripe at the pressure switch grounded.
Jun 25, 2016 at 6:42 AM
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STRAILER
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If I may, it sounds like you have an amplifier resistor that has gone out, here is a diagram to do some checking, but that what it looks like it could be

Best, Ken
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Jun 25, 2016 at 8:26 PM