A/C compressor clutch engages cyclically - no cold air


Asked by May 19, 2015 at 03:51 PM about the 2010 Mercury Mountaineer Premier AWD

Question type: Maintenance & Repair

The Clutch on my A/C compressor engages for 30 seconds then stops and engages
again for 30 seconds then stops, this goes on and on (cyclical). Does anyone know why
the clutch would engage and disengage every 30 seconds?

2 Answers


That is a normal cycle for a compressor. Have your refrigerent level checked to make sure you have enough to operate the system effectively. You might have a leak or it may just be low.


Thank you for responding. I understand that the clutch cycles on and off under normal conditions. I did have the levels checked, the system was evacuated and refilled. The mechanic used the three gauges to verify the pressure, etc. The problem still exists. If it were a normal situation, considering the refrigerant level is ok, I would get cold air but I am not. The car is only four years old and one year we had a cold summer so the AC was hardly used at all. For it's age and the amount of use I find it hard to believe that the compressor is bad. Is is possible that the clutch is the issue? When I first purchased the vehicle in 2011, it was new and when I shut the car off after running the AC there was a whistling sound. I brought it back to the dealer and they said it was normal, some valve on the firewall or something like that. I don't want to go through the expense of replacing the compressor if that is not the problem.

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