AC on when it shouldn't be

[vbivans]

When the heater / AC control is set on fresh air and the temp dial is set in the blue, is the AC supposed to come on? Mine does and it seems like it should only come on if you have it set to AC.

2001 F350

[Dirk]

Are you talking about fresh air setting that is one click to the left of off before a/c? Then yes, something is up. Any setting to the right of off will turn my compressor on.

[cchase]

mine drips water like its on when I have it off too?

[Dirk]

Originally Posted by cchase

mine drips water like its on when I have it off too?

Mine doesn't ALWAYS drip water, but I've noticed that the evap core drain hole will drop water when I park at odd angles even a day or two after I use my a/c.

[NCHornet]

The AC compressors always run on these trucks, not just when the AC is turned on, but I don't think it should be dropping water out of the condensor.

[mschn99]

your compressor will cycle in Defrost, and any setting that involves just the main vents. It should not cycle in the foot mode.

[Dirk]

I just went and checked. Mine cycles in the foot mode, foot/defrost, and defrost.

[alabamafrog]

The compressor will run in every position except the top vent one to the left of off. It will run in the winter even when the temp knob is all the way in the red. Some folks have wired in a switch to turn off the compressor and they say it helps make the heater warmer. The heater core is also on in the summer and some folks plumb in a valve to turn the water flow off and they say it makes the AC much colder. Fords design kinda sucks. I like my ranger, it has a button for the compressor no matter what position you are in.

[NCHornet]

Alabama has it correct. Plumbing in the heater core shut off valve drops the AC temp between 10-15 degrees. Mine will already freeze you out of the truck so I don't need it but it does work.

[vbivans]

Thanks for all the input...I guess mine ain't broke. I agree, however, it does seem like a wierd design. Doesn't having the compressor cycling all the time cut into the mpg's?