AC control switch wiring
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Elder User
Joined: May 2004
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From: Northwest Florida
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.
Hotshot
Joined: Jan 2004
Posts: 19,768
Likes: 1,082
From: St Louis
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.
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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Elder User
Joined: May 2004
Posts: 812
Likes: 1
From: Northwest Florida
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!
Thanks so much!
Fleet Owner
Joined: Aug 2005
Posts: 23,667
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From: Easton,Ks
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.
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.
Hotshot
Joined: Jan 2004
Posts: 19,768
Likes: 1,082
From: St Louis
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.
Fleet Owner
Joined: Aug 2005
Posts: 23,667
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From: Easton,Ks
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.
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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Hotshot
Joined: Jan 2004
Posts: 19,768
Likes: 1,082
From: St Louis
"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...
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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Thread Starter
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Elder User
Joined: May 2004
Posts: 812
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From: Northwest Florida
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.
Thanks again.
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