Help! A/C system wiring - anyone know where this 4-wire junction is located?

[BarryJB]

Last big project following the 3.6 conversion was refurb and upgrade of the A/C... all the hard stuff went well, and then...

Does anyone know the location of the 4-way common connection "J/C (4 POLE) (LT)" shown circled in pic below? When A/C blower is on, this powers front condenser relay and compressor clutch via the temp (twisty knob) control switch. Meanwhile looking through docs hoping for clues.

With A/C blower turned on, power is getting through temp switch OK, and front condenser relay and fan operate - just no power to clutch terminal in engine compartment, so either the clutch wire got pulled out of this 4-pole J/C , or the wire from it to the clutch got accidentally cut (but not shorted) someplace... and clutch works fine stuffing 12V on it directly.

From the A/C clutch, the single wire goes forward separately along passenger side to front of engine compartment... can't see or feel anything up there; and the green wire that feeds power to this 4-way J/C from the temp control switch goes to a connector in the smuggler trunk (the other connector in the smuggler trunk goes to the evap blower). I know the brown ground wire in that same connector (used for the evap blower motor) runs somehow across or around the luggage compartment to a ground stud to the rear of the fuse panel area...

In the meantime, I'll run a temporary wire... at least to finish charging & testing everything...

[Scott R]

Same thing happened to me when I did my A/C project earlier this year. I spent about 10 mins tracing the thick green wire up to the middle of the harness to the rear that runs along the side of the passenger seat. Then I gave up and ran a new wire from the temp switch back. I guess I'm a quitter.

[BarryJB]

Originally Posted by Scott R

Same thing happened to me when I did my A/C project earlier this year. I spent about 10 mins tracing the thick green wire up to the middle of the harness to the rear that runs along the side of the passenger seat. Then I gave up and ran a new wire from the temp switch back. I guess I'm a quitter.

LOL, but I'm not sure I can stand to leave it that way... it worked before the conversion. I believe I've just found the pesky thing in the parts diagrams... marked by red arrow. I think "11" is the clutch wire and "1" & "3" are the front condenser blower relay and connector. Also looks like the upper left cable, connector & relay is the stuff in the smuggler trunk - the cable runs with the blower ground to the fuse boxes area, so the drawing *maybe* suggests the 4-way junction might be up front somewhere around or behind the fuse boxes.

I'm pragmatic, but I hate letting this stuff beat me...

[Scott R]

11 is your guy, plugs into the plastic connector at the end of 12.

[BarryJB]

Dug around last night... Found the wire junction connector by tracing wiring from front condenser relay - it's below luggage fuse boxes, underneath fuel tank filler hard pipe, behind white rectangular expansion tank... and best of all, the A/C clutch wire was disconnected and folded back over it. It does look then like it was inadvertently removed during the engine conversion - there was no 4th wire connection to the junction which would have been the DME wire in the removed 3.2 harness.

Also noted a potentially exploitable difference in front condenser fan wiring/op on 993 - will post in one of the front condenser upgrade threads about that...