Fusion AC Compressor Failure

My 2003 Ford Fusion diesel's A/C compressor isn't working. The system won't switch on, and the car isn't cooling. A diagnostics device showed an error in the memory. I suspect undervoltage. Could it be the AC relay, pressure sensor, belt tensioner, or pressure switch?

4 comment(s)

I had a similar issue with my Fusion recently. The A/C just quit. Have you checked the AC compressor fuse and relay? That's where I'd start. Also, is your battery good? Low voltage can definitely mess with the A/C system.

I checked the fuse and relay; they seem fine. The battery seems adequate, but I haven't measured its exact voltage. Is it possible undervoltage is still the problem?

Yeah, even if the battery seems okay, a slight voltage drop can still cause A/C issues. It's a sensitive system. After checking the basics, I took mine to a workshop. They diagnosed it and sorted it quickly. Might be worth doing the same.

I consulted a workshop, as you recommended. The problem was undervoltage. After fixing the electrical issue, the A/C compressor is now working. The repair cost 240€. Thanks for pointing me in the right direction!

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