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A/c compresor won’t turn off

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3 years 1 month ago #57751 by eduardo.reyes
A/c compresor won’t turn off was created by eduardo.reyes
Hello I have a Ford freestar with orifice style system and the a/c compresor won’t cycle off. The a/c clutch is always engage

Everything is new except for the evaporator core and I did a flush on all the lines

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3 years 1 month ago #57754 by eduardo.reyes
Replied by eduardo.reyes on topic A/c compresor won’t turn off
I replaced the relay
I notice the clutch gap is very close can that be related? I order a new a/c compresor and it’s getting here Tuesday I hope that fix the problem

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3 years 1 month ago #57755 by Hardtopdr2
Replied by Hardtopdr2 on topic A/c compresor won’t turn off
Did you try unplugging compressor to see if it stops running? You might have a short to power some where also what are the high side and low side pressures while it's running?

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3 years 1 month ago #57756 by eduardo.reyes
Replied by eduardo.reyes on topic A/c compresor won’t turn off
The compresor turns off when I press the button but it makes a rattle noise at the clutch plate

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3 years 1 month ago #57757 by Hardtopdr2
Replied by Hardtopdr2 on topic A/c compresor won’t turn off
Ok with engine off look between plate and clutch and check for packing material/ paper plastic etc that might of found it's way in between there. Otherwise I would say get another unit if not easily fixed

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3 years 1 month ago #57758 by eduardo.reyes
Replied by eduardo.reyes on topic A/c compresor won’t turn off
I will check thank you I will let you know what I found

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3 years 1 month ago #57784 by eduardo.reyes
Replied by eduardo.reyes on topic A/c compresor won’t turn off
Question: what if the voltage never goes off white the conector out of the compreser

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3 years 1 month ago #57786 by Hardtopdr2
Replied by Hardtopdr2 on topic A/c compresor won’t turn off
If it has voltage with with ac turned off then you will need to see a wiring diagram to make sure it's not a ground side switched circuit or a bias voltage to check system integrity. Also how many wires are at ac compressor connector?

So with key off ac off check voltage at connector
With key on engine off ac off check voltage
Key on engine on ac off check voltage
Key on engine on ac on check voltage

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3 years 1 month ago #57787 by eduardo.reyes
Replied by eduardo.reyes on topic A/c compresor won’t turn off
It has only two wires
When the vehicle got here I checked at the conector and saw voltage but the compresor was not turning on so I replaced the a/c compressor and then the system was plugged so I replaced the orifice tube and I replaced the auxiliary filter. And flush the system. So I replaced compresor, condencer, reciver dryer and lines flush,

So know the system is cold but the a/c compresor is not turning off I disconnected a precise sensor from the a/c and the compressor turned off

I remember when I was diagnosis the compressor it was receiving voltage but the voltage was not turning off I thought it was because of need of Freon or something but know that the system is good the only problem is that the compressor won’t turn off I’m afraid of sending the vehicle and the compressor overheating or get damage because it’s not doing the cycle

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3 years 1 month ago #57789 by Hardtopdr2
Replied by Hardtopdr2 on topic A/c compresor won’t turn off
Ok with that I would chase the wires back to fuse box and see if it's shorted to power or if the relay is stuck on. Also look at live data either through HVAC if auto ac or body control module if manual and see if data changes for ac commanded. If those data sets don't change from the button being turned off it could be the button or module keeping power on.

A quick test for short to power to clutch is pull ac clutch fuse and check both sides of fuse slots for voltage. If there is voltage on both then you will need to follow the wires and look for where it's shorted.

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