AC control switch wiring - Ford Truck Enthusiasts Forums



AC control switch wiring

Reply
 
 
 
LinkBack Thread Tools Search this Thread
  #1  
Old 03-20-2010, 10:19 PM
bunklash's Avatar
bunklash bunklash is offline
Elder User
Thread Starter
 
Join Date: May 2004
Location: Northwest Florida
Posts: 734
bunklash is gaining momentum as a positive member of FTE.
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.
Reply With Quote
  #2  
Old 03-21-2010, 08:05 AM
Franklin2's Avatar
Franklin2 Franklin2 is online now
Moderator
 
Join Date: Jan 2001
Location: New Market, VA
Posts: 37,333
Franklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant future
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.
Reply With Quote
  #3  
Old 03-21-2010, 08:38 AM
projectSHO89 projectSHO89 is online now
Post Fiend
 
Join Date: Jan 2004
Location: St Louis
Posts: 12,053
projectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant future
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.
Reply With Quote
  #4  
Old 03-21-2010, 10:28 AM
bunklash's Avatar
bunklash bunklash is offline
Elder User
Thread Starter
 
Join Date: May 2004
Location: Northwest Florida
Posts: 734
bunklash is gaining momentum as a positive member of FTE.
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!


Reply With Quote
  #5  
Old 03-21-2010, 11:40 AM
subford's Avatar
subford subford is offline
Post Fiend
 
Join Date: Aug 2005
Location: Easton,Ks
Posts: 19,797
subford has much to be proud ofsubford has much to be proud ofsubford has much to be proud ofsubford has much to be proud ofsubford has much to be proud ofsubford has much to be proud ofsubford has much to be proud ofsubford has much to be proud ofsubford has much to be proud ofsubford has much to be proud of
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.
Reply With Quote
  #6  
Old 03-21-2010, 04:12 PM
projectSHO89 projectSHO89 is online now
Post Fiend
 
Join Date: Jan 2004
Location: St Louis
Posts: 12,053
projectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant future
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.
Reply With Quote
  #7  
Old 03-21-2010, 04:35 PM
subford's Avatar
subford subford is offline
Post Fiend
 
Join Date: Aug 2005
Location: Easton,Ks
Posts: 19,797
subford has much to be proud ofsubford has much to be proud ofsubford has much to be proud ofsubford has much to be proud ofsubford has much to be proud ofsubford has much to be proud ofsubford has much to be proud ofsubford has much to be proud ofsubford has much to be proud ofsubford has much to be proud of
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 6║C (43║F).

The blower motor is on.

The center console blower motor is enabled.
Reply With Quote
  #8  
Old 03-21-2010, 06:02 PM
projectSHO89 projectSHO89 is online now
Post Fiend
 
Join Date: Jan 2004
Location: St Louis
Posts: 12,053
projectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant futureprojectSHO89 has a brilliant future
"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...
Reply With Quote
  #9  
Old 03-21-2010, 07:44 PM
Franklin2's Avatar
Franklin2 Franklin2 is online now
Moderator
 
Join Date: Jan 2001
Location: New Market, VA
Posts: 37,333
Franklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant futureFranklin2 has a brilliant future
Yea, what they said.
Reply With Quote
  #10  
Old 03-22-2010, 09:38 PM
bunklash's Avatar
bunklash bunklash is offline
Elder User
Thread Starter
 
Join Date: May 2004
Location: Northwest Florida
Posts: 734
bunklash is gaining momentum as a positive member of FTE.
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.
Reply With Quote
  #11  
Old 03-22-2010, 09:53 PM
subford's Avatar
subford subford is offline
Post Fiend
 
Join Date: Aug 2005
Location: Easton,Ks
Posts: 19,797
subford has much to be proud ofsubford has much to be proud ofsubford has much to be proud ofsubford has much to be proud ofsubford has much to be proud ofsubford has much to be proud ofsubford has much to be proud ofsubford has much to be proud ofsubford has much to be proud ofsubford has much to be proud of
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.
Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Old Air Hurricane and EZ Wire question 89gtstang 1948 - 1956 F1, F100 & Larger F-Series Trucks 6 08-18-2016 06:20 PM
2007 Expedition A/C Clutch not engaging Netroamer 2007 - 2014 Expedition & Navigator 0 06-28-2016 10:44 PM
a/c compressor won't kick on cjdmcgarry 1987 - 1996 F150 & Larger F-Series Trucks 1 08-19-2014 11:12 AM
Air Conditioner compressor braduh60 1987 - 1996 F150 & Larger F-Series Trucks 2 08-06-2012 10:18 AM
Testing AC compressor TheKirbyMan 1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks 7 09-18-2010 11:01 PM


Go Back   Ford Truck Enthusiasts Forums >

Tags
95, ac, control, diagram, f150, f53, ford, mode, switch, wiring

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump


All times are GMT -5. The time now is 07:23 PM.


This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. Ford« is a registered trademark of the Ford Motor Company.