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A/C compressor cycles when not selected

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While changing the oil on my truck last night, I noticed that water was draining from the A/C hose from the firewall. I have not had the A/C on for the last month. I have the dash selector set to floor or floor/vent. With the engine running, I watched the A/C compressor cycle on and off. What would cause the A/C compressor to cycle on and off when the A/C is not selected?

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My 98 ranger did the same thing when on face/floor..

I haven't noticed it on my 05, but also have listened/looked for it.

I wonder if the duty cycle is difference with the a/c switch on.

--- Update to the previous post...

Well I pulled this from my 05 Owners Manual.. It appears it only operates in the mix/defrost with the a/c off. My Ford manual specifially stated which levels it worked it.


The air conditioning compressor operates in

both Mix and Defrost or a blend of these modes, even if

the A/C button has not been pressed. This dehumidifies

the air to help dry the windshield.

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