Question about 1993 Nissan Quest

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A/C clutch won't start compressor; level is 45 on low pressure side

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  • Nissan Master
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45 is a little high for the low side I think. Key question - is a/c clutch cycling at all? If you remove the 2 wire connector from the a/c cycling switch on the receiver.dryer under the hood and then jumper the connector with a wire, will the a/c clutch engage?
If yes, then you need to check fuses & relays uner hood by battery and by passenger fender under hood. If all ok, you may have a bad control head inside car. Does a/c come in defrost mode?

Posted on Jan 09, 2009

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1 Answer

Overcharge refrigerant


The low side will not tell you if the system is overcharged or not. You would need a gauge hooked up to the high side to know that.
It could be a relay, ac clutch, or pressure switch problem.
35 - 45 psi on the low side is normal

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Ac compressor cycling with no cool air blowing inside


Depending on how much freon is in the system, it could be a faulty low pressure switch or a faulty clutch.
You would jumper the low pressure switch to eliminate it for a test.

Jun 08, 2013 | Cars & Trucks

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2005 Sedona fully charged,compressor does not turn on


Normally you would check for voltage at the relay then the low pressure switch, then the compressor clutch.
With the system charged or the low pressure switch bypassed you should have 12 volts at the clutch and ground. You can also check the clutch with an ohms meter to see if the magnet is open.

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1 Answer

1991 Mercedes Benz AC Cycling Switch /Compressor Clutch Won't Engage Completly Spins 1/6 of a complete spin repetedly then stops


You need to have the refrigerant charge level checked, it sounds like it is low. You Need a set of AC pressure gauges to do this testing. If the system has a low charge the pressures will be very low in the low side testing port.

Jun 26, 2012 | Cars & Trucks

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I have a 2001 Ford Mustang V6, the ac is blowing warm air. We checked the refrigerant and it is full. The ac compressor will kick on for a few seconds and then kick off. Why is the compressor not staying...


it's either low (in spite of your readings) or your a/c clutch is not working correctly or you have too big an air gap in the clutch.
First, just disconnect the 2 pin connector from the a/c pressure cycling swithc and jumper the 2 pins with a wire to force the clutch to stay engaged. See if it blows cold then, and stays engaged. You can run this way for about 15 minutes before you have to pull the plug.
report reulsts.

please don't forget to rate.

Sep 01, 2011 | 2001 Ford Mustang

3 Answers

Replaced the ac compressor but now no power to compressor but have power to low and high pressure switches. checked relay under hood, relay and fuse in cabin. what am i missing?


Put a jump wire in the high pressure switch plug. If the compressor works. replace the high pressure switch. Let me know and we can go from there.

Aug 22, 2011 | 1999 Ford Expedition

2 Answers

When i turn on the a/c,the compressor does not work


CHECK REFRIGERANT CHARGE. USING A MANIFOLD GAUGE SET. HOOK MANIFOLD GAUGE SET TO LOW PRESSURE PORT AND HIGH PRESSURE SIDE PORT. LOW SIDE PRESSURE SIDE SHOULD HAVE 25 - 36 PSI AND HIGH PRESSURE SIDE SHOULD BE 178 - 237 PSI. IF LOW SIDE PRESSURE SIDE READ BELOW 20 PSI THE LOW PRESSURE SWITCH WILL NOT TURN ON THE AC COMPRESSOR CLUTCH NEED TO ADD LITTLE MORE REFRIGERANT. IF REFRIGERANT LEVEL CORRECT CHECK AC COMPRESSOR FUSE AND RELAY.IF POWER GOING TO AC COMPRESSOR CLUTCH YOUR COMPRESSOR CLUTCH HAS OPEN WINDING. AC COMPRESSOR CLUTCH NEED REPLACING.

Aug 11, 2011 | 1997 Nissan Pathfinder

1 Answer

1984 honda accord AC problem, Clutch does not engage fuse good


The clutch will not engage unless there is sufficient refrigerant in the system.

I believe the 1984 Honda originally had r-12 which is largely illegal in the U.S. nowadays in that a certified mechanic must recover and recycle that kind of refrigerant.

I would recommend that you convert it to r134a if you can afford to do this, by putting new fittings on for a quick connect on the low side.

Add about 2 or 3 cans down at the compressor's low side (low pressure) which has larger pipes than the high side (high pressure).

Charge until the hose says you have 25 psi to 45 psi on the low side while the compressor clutch is turning.

good luck to you on this problem.

Jul 08, 2010 | Honda Accord Cars & Trucks

1 Answer

No air conditionong have 45 psi freon compressor turns but clutch wont engage when it did it turned on and off numerouse times


You don't have enough freon in it. 45 psi when the compressor is not turning is low, Add one can and see what happens. Normal low side pressure with the compressor turning is 35 psi.

Jun 07, 2009 | 2000 Ford Taurus

1 Answer

Clutch on compressor will work sometime than quit go down a bumpy road starts working again. is it the interruptor switch?


There is no interrupter switch on the a/c system. The only reasons that the clutch wouldn't engage is
1.- there is a short in wire to clutch
2.- the freon level is to low
3.- the low side pressure switch has failed
4.- the compressor clutch is going out
Hope this helps you get this problem taken care of. Good luck.

Jun 05, 2009 | 1998 Chevrolet Tahoe

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