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Fan works compreser will not engage can unplug wires from dryer jump cross and compreser will engage.is this low pressure side and just need 8oz of 134a or do need to check other parts of system?PIEASE HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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  • Nissan Master
  • 4,369 Answers

Yes, usually low charge. Add a 14 oz can and see if it works then. It helps to have fill hose with gage with safwe zone on it, so you can watch after adding.

Posted on May 24, 2011

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99 chrysler lhs air compressor won't work


unplug the low pressure switch in the air conditioner line near the dryer with air switched on , jump the connector with a short piece of wire to see if the compressor clutch engages. If it does your pressure switch is bad. If the pressure switch is good then there is a fuse near the compressor somewhere that may be blown. If it blows new fuse your clutch is bad.

May 16, 2017 | Chrysler Cars & Trucks

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Is the switch that turns on cooling fans the same switch that turns on the air compressor i just replaced compressor and other parts and had it vacumed out ,oiled and recharged . and compressor wont


possible you have a bad low or high pressure switch on a/c system bad causing compressor not to engage, find switchs and jump across wires and see if compressor engages

Sep 03, 2012 | Kia Cars & Trucks

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A/C compressor on 95 astro van does not engage at all.


There are a few reasons for the compressor not engaging. Lets start with the most common. low ac gas.A bad clutch on the compressor.Blown fuse.
Let is start with testing for low gas. (134a freon).Locate the dryer. this is on the passenger side of engine compartment. it looks like a tall cylinder, on the top side you will see a switch. unplug switch connector and jump the two terminals in connector with a piece of wire, this is the low pressure or cycling switch. you will be completing the circuit by jumping a wire across the terminals.If the compressor turns on when connectors are jumped then you are low on gas and the system needs recharging.
If the compressor does not urn on then check all fuses, if fuses are good then the next step is to go to compressor and test for power and ground. If you have power and a good ground on the connector to compressor then compressor clutch is bad.A bad clutch will some times blown fuses, so if you replace the fuse because it was blown and it blows again then clutch is bad.
Another test that will help is when you remove the connector from the cycling low pressure switch , test the connector. one wire on the connector should have power when ac is turned on,
Hope this helps let me know what the outcome is. Good day.
I have enclosed a picture of the switch and dryer to help you locate it.If you jump the terminals

Mar 23, 2012 | 1995 Chevrolet Astro

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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

1 Answer

I have a 97 suburban. The A/C clutch engages (and I have cold air) then with disengage (warmer air) and later engage again. I cannot figure this out.


It sounds like you have a low freon condition in the AC system.
1. Go to the passenger side fender and look over the fender and to your left.
2. There should be a silver aluminum looking cannister that has an Air conditioning line attached.
3. Look for a little sensor with a plug attached (probably has 2 wires)
This is your low pressure AC cutout switch.
4. Unplug the connection and cross the two wires together with a paper clip or small cotter pin.
This will bypass the low pressure cutoff.
5. If the AC runs continuously when you do this.. then you have low freon in the system or a faulty low pressure switch. (Do not run the system permanently like this.. it could damage your compressor)

Best of luck..

Aug 18, 2011 | GMC Suburban Cars & Trucks

1 Answer

Clutch on comp will not engage tried jumping checked frion have 150 on high side 55 low side checked fuses even unpluged high pressure switch on back of comp.


if the Ac compressor clutch isnt engaging even with a hot wire then the solonoid has packed up if does engage then it could be a pressure safety switch although i would empty the system with my machine and weight the gas i take out as if less than 150 grms then it will not work ,never mind the pressure its the weight of gas in the system that makes the switch allow the compressor come on

Jun 07, 2011 | 1999 GMC Sierra

2 Answers

Air condition pump does not work ,Clutch does not engage on pump.Is there a fuse for this


THERE IS A FUSE,HOWEVER MORE COMMONLY YOUR SYSTEM IS LOW ON R12 AND CUTOFF SWITCH IS ACTIVATED. TRY JUMPING THE CONNECTOR OUT OF THE ACCUMLATOR,THERE SHOULD BE A SWITCH ON IT,PULL CONNECTOR AND WITH VEHICLE RUNNING GET A PIECE OF WIRE AND INSTALL THEM IN BOTH FEMALE TERMINALS. IF A/C CLUTCH ACTIVATES SYSTEM IS LOW OR BAD SWITCH OR BAD FIELD COIL OR CIRCUIT DAMAGED

Jul 13, 2009 | 1981 Ford F 150

2 Answers

1996 Buick LeSabre AC Stopped Working


The first thing to check is if there is enough gas. The compressor will not work when the gas is low. There is a small inspection glass on the line. This needs to be clear. If you see streaks or bubbles means the gas is low. Never mind the pressure or wiring for now, Add one can of gas and this should get that first part done.

Jun 29, 2009 | 1996 Buick LeSabre

2 Answers

I need to know how to jump the ac low pressure to get my ac compressor to come on.


If you look on the low pressure side of the AC system you will see a plug that is incorporated in to the line. It will have two wires leading to it. Remove the plastic clip that attaches the two wires to the sensor and use a short piece of wire to connect the two terminals in side the plug by putting the ends into the cap. This will bypass the low pressure sensor and allow the AC clutch to engage and begin to cycle again. Remember this low pressure switch is there for a reason. If you don't add more r-134 to the system and allow the AC compressor to cycle you will destroy the compressor. You need to charge the system when you bypass the low pressure switch and get the system up to full charge status and reconnect the switch.

May 24, 2009 | 1995 Chevrolet Camaro

1 Answer

A/C clutch will not engage automatically


FIRST THOUGHT, I WOULD REWIRE THE LOOP EXACTLY LIKE IT CAME ORIGINALLY. NEXT YOU NEED TO CHECK THE LOW PRESSURE SWITCH LOCATED ON THE DRYER. YOU CAN DO THIS BY UNPLUGING THE SWITCH AD JUMPING THE TWO WIRES ON THE HARNESS. IF THE COMPRESSOR COMES ON, I WOULD SUSPECT THE LOW PRESSURE SWITCH TO BE BAD. LET ME KNOW IF THIS HELPS.

Jul 02, 2008 | 1996 Ford Explorer

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