Ford A/C on all the time

[JohnMickish]

I've got a 2002 F150 Supercrew with the 5.4 and manual A/C. The compressor runs anytime the the selector switch is on anything but off. It's not supposed to run all the time and it makes finding a comfortable setting difficult. Any ideas on why the compressor is always on?

[Shack]

Quote:

and it makes finding a comfortable setting difficult.

Are you saying it blows A/C (cold) air out of the vents all the time?

Do you have the temp set all the way to cold? Does the comp. run when on dash vents? (At minum. it should not with those).

Do you have automatic temperature control?

Could be anything from an ATC head, crack in plenum or blend door actuator?

Are you watching the comp. from under hood engaging on and off while switch is being switched from on and off?

[Scott K]

On the 01 f150's the a/c compressor will run on all setting except off/floor/vent. The a/c compressor will run on all of the other settings including floor/panel! If it does in deed run in vent and floor then I would check the mode selector switch to see if there is in deed power coming out of it in the floor/vent position on the Violet wire. If there is, its a bad switch.

[JohnMickish]

It runs in ALL positions except off.

[Jeremy airjer W]

Sorry john I kept forgetting to check into this at work. 4 has you pointed in the right direction. power comes from the lt blue/pink wire goes into the control head and is directed to the violet wire when the switch is in a position that engages the a/c. You should only see power on the violet wire when the switch is in the max a/c, a/c, floor defrost, and defrost posistions. There should be no power to the violet wire when the switch is in the panel, off, panel floor, and floor poistions. Its the only thing that makes any sense according to the diagram.

Let us know what you find!

[JohnMickish]

I had it fixed. Apparently I had a $100 bill stuck in my wallet. Once they removed it things started working fine.

[Scott K]

I had it fixed. Apparently I had a $100 bill stuck in my wallet. Once they removed it things started working fine.

So what did you trade the $100 for?

[JohnMickish]

The wife handled it so I'm not sure what they did. Took care of it at the same time they did the CC recall.