Question about 1996 Ford Mustang

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Need to replace this switch

Where is the ac cycling low pressure switch located

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On passenger side of car at evaporator tank it is screw in with two wire plug. you can jumper the plug to see if ac stays on then you know cutout switch is faulty or actually has low charge..

Posted on May 08, 2009

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The low pressure switch (also known as the AC compressor switch) will be under the hood, it will be located in the low side AC line from the AC compressor, this is the larger of the two lines from the AC compressor. See picture below, looks like it has a three wire connector. Also what is the AC doing that makes you think this switch is defective? Cycling on and off constantly?

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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.

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The very 1st thing you do is see if the AC system has lost its charge of refrigerant. If the system is low on charge then the relay will not engage because it receives no signal from Compressor cycling switch which in most Fords is located in the low side AC line from the compressor, the low pressure line is the larger of the 2 lines from the AC compressor..

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I have a 98 blazer that in the morning blows ice cold air. After driving for awhile it will stop blowing cold and if you turn it off wait and turn ot back on it sometimes blows cold again. ANy ideas


I would replace the low pressure AC compressor cycling switch, it may be sticking, it is a fairly common problem. The switch is located in the low side of the AC system hoses or accumulator.

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2002 ford mustang air conditioner stopped working. How do I locate the problem?


FIRST I CHECK ALL FUSES AND RELAY.TO BLOWER MOTOR IF IT STOP BLOWING.AND CHECK FUSE TO HVAC SWITCH CONTROL.AND CHECK FUSE / RELAY TO AC COMPRESSOR.IF FUSE / RELAY GOOD POWER GETTING TO AC COMPRESOR CLUTCH COIL AND LOW PRESSURE SIDE 28 PSI AND HIGH SIDE 200 PSI. CLUTCH COIL IS OPEN.IF REFRIGERANT LEVEL LOW YOU MAY NEED MORE REFRIGERANT.YOU NEED AT LEAST 28 PSI ON LOW SIDE AND 200 - 220 PSI ON HIGH SIDE.IF ALL IS GOOD STILL NO AC PROBLEM COULD BE A FAULTY AC CLUTCH CYCLING PRESSURE SWITCH.

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1 Answer

AC compressor clutch is cutting on and off steadily during compressor operation.Is this clutch or clutch coil?I was pushing buttons on electronic climate control,and suddenly AC stopped working,only have...


You have to start by testing the pressure in the system. If it was cycling a lot and then quit it sounds like you developed a leak somewhere and once it fell below the low pressure switch it will not come on.

The system works with a high and low pressure switch that will cut out if the pressure is too high or low. When the system looses pressure it will fall below the low while running, turning off the compressor, When the compressor is off the high side and low side equalize out bringing the stationary pressure above the low limit, turning the system on again. This cycle will repeat until there is not enough pressure when equalized to turn the system back on.

If the pressure is good, go next to the relay, it should be located on the fire wall. if the relay is right, then you need to determine if it is high or low pressure switch shutting it off. IF it is the high, you probably have a restriction in the system, You could also have a problem with the compressor. With the car not running manually turn the clutch and see how much play, smell the area and smell if there is a burnt odor, then try to turn the armature that goes into the compressor. see if it is frozen.

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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.

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1 Answer

Pressure cycling switch


If your talking about the AC it is on the low side line....if not clarify please....hope this helps....thanks for rating my effort...the Fang

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