2001 Subaru Outback A/C Won't Cycle

2001 SUBARU
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SK2853
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I have a 01 outback wagon with the H6 (6cyl) automatic with almost 90k miles. I purchased on ebay w/83k miles so I dont know the service history other than no accidents and clear title.
My a/c was very intermittant this last summer.
I took it to a shop to evacuate the 134a I took it home and then connected to a vacuum pump and it held the vacuum for 20 min. I put approx 24oz of 134a back into the system and noticed that the compressor clutch engauged for about 5 seconds and wont re-engauge. My low and high side readings are equal at approx 75 psi (which I think is normal when the compressor is not cycling) My feelings are that it could possibly be the press cycling switch located in the reciever dryer but I am not sure. Just would like all options before I evac and recharge again.
NOTE: I took it to a small shop and with out asking me, the mechanic ran a jumper wire from the pressure cycling switch to the compressor. When I got the car back my a/c was cold and seemed to work great. What I found later was that the compressor was running all the time. I took it back 2 days later and they repaired the wires and refunded my money. When I picked up the car after many apologies they said they thought it was a faulty expansion valve. I purchased a exp valve from subaru and installed it and just did the evac and recharge that this letter started with.
Jan 20, 2007 at 10:41 AM
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STRAILER
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first check to see if there is power at the pressure switch when the system is truned on. If so jump the connector to see if the compressor comes on, if so replace the pressure switch.
Jan 20, 2007 at 12:59 PM
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SK2853
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The pressure switch has four wires, do you know which to jumper? The hot lead is the green and there is power to it, just not sure about which one to jump to. yellow, black or red


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Jan 21, 2007 at 2:01 AM
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STRAILER
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There are many diffrent choices of cars, you need to follow the mictehll1 link at the bottom of the page to get the wiring diagram for you car.
Jan 24, 2007 at 4:06 AM

Suggested Repair

With the A/C on, check for power at the pressure switch. If power is present, jump the switch connector; if the compressor clutch engages, replace the pressure cycling switch. Use the vehicle-specific wiring diagram to identify the correct terminals before jumping the four-wire switch.

Conversation Summary

The owner of a 2001 Subaru Outback H6 reported intermittent A/C. After evacuation and recharge, the compressor clutch engaged briefly and would not reengage, with equal high and low pressures around 75 psi. A shop had previously jumpered the pressure cycling switch so the compressor ran continuously, then suggested a faulty expansion valve, which the owner replaced without resolving the issue. The expert advised checking for power at the pressure switch and jumping its connector; if the compressor then runs, replace the switch. When asked which of the four wires to jump, the expert said to consult the vehicle-specific wiring diagram.

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