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Old 03-03-2009, 02:12 AM   #1
ryan1428
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How to test if my AC compressor still works.

The system is completly empty. How do I activate the AC compressor to test if it still works. I know how to do this on my GM cars. Know how to trick it into thinking it has pressure in it. It's just for a second to see if it cycles on and off. Not sure how to do this on my focus. Appreciate any help.


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Old 03-03-2009, 05:31 AM   #2
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There are a few ways to do this. Jump the compressor directly by applying 12v and a ground to the compressor terminals. Or locate the compressor relay that energizes the compressor (there are several involved. you need to locate the last one in the diagram). You'll need a factory manual to do that.

The easiest way......temporarily add a pound of freon to the system. That will also tell you if the compressor is actually working, not just turning. When you're ready for the final charging, you just suck out that test charge, evacuate the air, and recharge to the proper amount.
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Old 03-03-2009, 02:07 PM   #3
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Should it come on if I put 12v to the terminal that is mounted directly on the compressor........the connector directly behind the clutch assy? I tried to ad freon but it would not charge....thought the compressor needs to be on to suck in the freon? This is the reason I was asking. Think there is a leak. Would like to use one of those UV Dye kits to find the leak but need to get some freon and dye into the system in order to circulate it.

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Old 03-03-2009, 04:42 PM   #4
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I don't know about your compressor, but most turn on when 12v is applied to the correct wire leading to the plug (with the wiring harness still plugged in).

How to get freon into the system when it's empty.....obviously the compressor won't turn on because there's no pressure in the system. So you can hook up your can to the low side port under the passenger fender. Open the valve on the can (nothing goes in to speak of). Your can needs to be on a short hose.....set it in a pan of hot tap water. The heat will push the freon into the system. After about half the can is pushed in, you can start the car and see if the compressor starts. If it doesn't add more hot water. Eventually the compressor will start, and will suck in the rest of the can.

Be certain to wear safety goggles when you work on these systems.....I've done that operation numerous times successfully.
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Old 03-03-2009, 11:55 PM   #5
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Wow, great info!! You have been rewarded XD
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