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  #1  
Old 03-20-2010, 09:19 PM
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AC control switch wiring

Many searches did no good. I'd like to install a switch allowing me to choose when the AC compressor comes on. I don't mind the compressor being automatic on for defrost, but rather not use the compressor for every setting except the one Ford allowed. Is there anybody out there with a wiring diagram who could tell me which wires I'm hunting? Thanks in advance.
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Old 03-21-2010, 07:05 AM
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If you want to kill the compressor clutch, the wires are easily found out at the accumulator tank switch under the hood.

The A/C only works on "normal", "max" and "defrost" as far as I know.
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Old 03-21-2010, 07:38 AM
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Actually, the compressor is enabled in every position except OFF, VENT, and FLOOR.

If you want to manually control when the compressor clutch is enabled on an 02 F350, install a SPST switch on the violet wire on the mode switch (if manual) or the EATC (if equipped).

Turn switch off to disable the compressor, turn it on to allow default operation.
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Old 03-21-2010, 09:28 AM
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Right on guys. That was fast and right on target. I'd be happy if it did work the way Dave said, but it's more like projectSHO says. The owners manual says it works like that too, but my compressor is engaged in Floor position too! Don't know why of course, but always have prefered bieng able to manually select. Violet wire, here I come!
Thanks so much!


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Old 03-21-2010, 10:40 AM
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Looking at the wiring diagram for the '02 F350 the compressor should not come on in the OFF or floor position only. It does run in the vent position.

Sounds like you may have a computer problem if it runs in the floor position, if so putting a switch on that wire will not turn off the compressor.

The clutch is turned on and off by the computer.
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Old 03-21-2010, 03:12 PM
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Quote:
Originally Posted by subford View Post
Looking at the wiring diagram for the '02 F350 the compressor should not come on in the OFF or floor position only. It does run in the vent position.
I suspect that is an error in the EVTM (Cell 54-2) since it would make no sense to have both a "A/C" and a "VENT" position that are identical. The WSM describes the operation that is logical and is the same as every other Ford I've ever seen.

If the compressor is engaged in the FLOOR position, you'd better check it in the OFF and VENT positions, also. It might be a simple as a missing shim causing the clutch plate to not disengage. If the clutch is mechanically jammed, then you cannot control it electrically.
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Old 03-21-2010, 03:35 PM
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If he has it in auto from the 02 shop manual then:
When PNL/FLR is selected:

The recirculation door vacuum control is at no vacuum, admitting only outside air into the passenger compartment.

The panel/floor door vacuum control motor is at partial vacuum and the panel/defrost door vacuum control motor is at full vacuum, directing airflow to the floor duct and the instrument panel A/C registers.

The heater control valve is at no vacuum allowing the flow of hot coolant to the heater core.

The temperature can be adjusted to heat or cool the air below the outside temperature.

The A/C compressor will operate if the outside temperature is above approximately 6ºC (43ºF).

The blower motor is on.

The center console blower motor is enabled.
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Old 03-21-2010, 05:02 PM
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"PNL/FLR" is a discrete mode that is separate from both the "PANEL" and "FLOOR" modes. It is supposed to enable the compressor since it is not "PANEL" (vent-only), "FLOOR" (only), or OFF (self explanatory).

See the COMPLETE section of the WSM that you took that excerpt from in which each mode is fully described.

Sounds like he has the manual system anyway since the EATC already has an AC request button...
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Old 03-21-2010, 06:44 PM
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Yea, what they said.
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Old 03-22-2010, 08:38 PM
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I was mistaken. My compressor is on in every position except OFF and VENT. The owners manual, IIRC, says it should also be off in the PNL/FLR position, but I'm certain mine is engaged in PNL/FLR. Any way, like I said, violet wire, here I come.
Thanks again.
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Old 03-22-2010, 08:53 PM
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I would not go by the owners manual. I always go by the wiring diagrams or shop manual and that is also what the diagram said as I stated above.
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Old 03-22-2010, 08:53 PM
 
 
 
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