Air conditioner Compressor will not run

GLENN KETCHUM

MEMBER
1995 NISSAN TRUCK
2.2L
4 CYL
4WD
MANUAL
100,000 MILES

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.

Tuesday, May 10th, 2016 AT 4:08 PM

10 Replies

SATURNTECH9

MECHANIC
30,870 POSTS

So what are the high and low air conditioner pressures at idle?

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Thursday, June 23rd, 2016 AT 3:04 PM

JACOBANDNICKOLAS

MECHANIC
108,244 POSTS

Something is blocked internally. The low shouldn't be that high in the off mode. Saturntech, what do you think, orifice tube?

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Thursday, June 23rd, 2016 AT 7:48 PM

SATURNTECH9

MECHANIC
30,870 POSTS

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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Thursday, June 23rd, 2016 AT 10:08 PM

GLENN KETCHUM

MEMBER
5 POSTS

Guys I got mixed up on the high on low side the low side is 80 and the high side is 115

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Saturday, June 25th, 2016 AT 6:28 AM

GLENN KETCHUM

MEMBER
5 POSTS

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.

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Saturday, June 25th, 2016 AT 6:42 AM

KEN L

MASTER CERTIFIED MECHANIC
42,935 POSTS

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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