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2005 Ford Expedition No voltage @ compressor

2005 Ford Expedition with rear air. I have no voltage at the a/c compressor/clutch. I do have power at the low pressure switch. I have checked all fuses related to the a/c system and they are ok. I have replaced the a/c compressor/clutch relay. Visually inspected wiring from compressor as best I could and do not see anything out of the norm. Still no voltage. Any suggestions?

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You should check the freon in the system. If it is low you will not get any power to the compressor. Once you hook up the freon and start to flow it, the compressor will come on. Also, if there is too much pressure in the system, the compressor will protect itself and not come on. This is most likely your problem.

Posted on Sep 30, 2009

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I changed my air compressor for my air ride suspension and now i have no power to my compressor. i changed the compressor relay as well.


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Feb 17, 2011 | 1999 Ford Expedition

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Ac compressor not starting. added one can of 134R and no help. had a rebuild last year of the engine and has not worked since. Thinking it might be a wire some where.


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2002 Ford Expedition Eddie Baur Edition. Turn A/C on, no cold air. Could be freon but I am not hearing the compressor engaging. That bothers me. I should hear and feel it engaging. I have the auto. climate...


Check the fuse and relay for the compressor clutch. The clutch electrical winding could be open--check at the clutch electrical connection for 12 volts when the system is turned on. There is an interlock switch that prevents the compressor from being turned on if the system detects low freon level. Have that checked first, then worry about the electrics second. Hope this helps!

Jun 06, 2010 | 2002 Ford Expedition

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My 2002 Expedition air conditioner will sometimes blow hot air and others cold air


I would check the following possibilities:
1. Is compressor clutch working? - You need to do this when the ac is blowing hot air only - locate compressor drive pulley on engine - rubber belt wraps around it. Start engine and set to max ac. When the ac is blowing hot air, look at the center of the compressor drive pulley using a good flash light - watch it for a while, it should be spinning with the pulley - this means the compressor is engaged. If not, the compressor is not engaged. If your ac is blowing hot air, then the compressor should be engaged and running (trying to cool). If it is not engaged, then your compressor clutch is probably going out. Could be low voltage to clutch, but more likely the clutch is worn out and only working some of the time. Note: if working normally, the compressor clutch will engage and disengage in cycles- but the air should always be cold. If clutch is bad, compressor would need to be replaced (sold as one unit). This is tricky to diagnose and could take some time - you need to do it when ac is blowing hot air but set to max cooling.

2. Low on refrigerant or refrigerant has moisture in it? If your ac blows cold initially after being off for a while, then heats up, and continues to regularly cycle back and forth between hot and cool air, then the system may be low on refrigerant or the refrigerant may have moisture in it that is freezing and restricting refrigerant flow. An a/c shop can check refrigerant level and even replace refrigerant if moisture is suspected.

Could be other issues, but I would start with these.

Good luck

May 07, 2010 | 1999 Ford Expedition

1 Answer

I have a 99 ford expedition i replaced the air compressor cause the front air shocks were bad and ruined the compressor. and teh rear air bags went flat now that the new compressor is in the rear wont air...


I have a 2001 Expedition, I don't have air bags in the front, the compressor don't work the air shocks. You have rear leveling. When they replaced the (compressor) did they turn the leveling switch back on. you may have air shocks connected to the compressor. Did the rear go down right after or over a couple of days. If the switch is on, turn it off and jack the rear up quiet a bit, make sure both side are quiet equal with each other, like it would be if it where raised by the air bags. Turn your level switch back on with it jacked up or sitting on stands. It may have went down so much that the compressor can't raise them back up.

Jan 04, 2010 | 1999 Ford Expedition

1 Answer

How many air compressor pumps are there in a 2000 ford expedition


HI. I assume you are referring to the air ride compressor pump. If so, there is only one central compressor, that distributes the compressed air, via line connections. This compressor should be located in the rear section of the vehicle, inside the left, or right panel.

Location my vary from model to model

Dec 25, 2009 | 2000 Ford Expedition

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