| Heater and Air Conditioner Control Connections [message #173985] |
Tue, 19 June 2012 23:32  |
A Hamilto
Messages: 4508
Registered: April 2011
Karma:
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Senior Member |
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When removing the Air Conditioning components from a GMC that is being parted out, I was careful to not destroy anything I removed, but somebody before me had been somewhat ruthless. The dehydrator was gone for one thing. And the fact that the control panel was in the garage with all the vacuum lines and wires cut isn't going to make re-installing the hardware in mine any easier.
To cut to the chase, I need to recreate the 12VDC connection from the control panel to the compressor, through all the interim components. I understand everything except the part from the first two-way connector after the control unti to the next "box" in the wiring diagram.
According to the 12VDC Engine wiring diagram, the circuit for the air conditioning compressor is as follows:
HEATER & A/C CONTROL ASM--16 DK GRN--<2)--16 DK GRN--[DZ]---16 DK GRN--<2>--16 DK GRN--<2>--A/C AMBIENT SW R.P.O--<2>--16 DK GRN--A/C COMPRESSOR CUT-OFF PRESSURE SW R.P.O--16 BLK--<2>--16 BLK--A/C COMPRESSOR - R.P.O--16 BLK--|
I can understand the legend when it says a <2) or a <2> is a two-way multiple connector, but I can't make any sense of the [DZ]. The legend says it is a junction "LETTERED TERM WIRE CAVITY @ WIRE END OF 28 WAY CONN. (PART OF INSTR PANEL HARN ASM)" and the legend function is "INSTR PANEL HARN TO ENGINE HARN & FWD LP WRG. HARN." The legend says the location is the ENGINE COMPARTMENT - DASH PANEL UPPER RH SIDE".
Can someone provide a picture or better description, please? I can find a vague reference to an "INSTRUMENT PANEL HARNESS" in a figure in the MM, but can't find anything in the MM that details the connections in that INSTRUMENT PANEL HARNESS. When I dig into the dash, am I going to find a connector in that harness labeled "DZ"?
And on the AC Control itself, it looks like there are three spade connectors corresponding to the 12VDC coming in to the center "bus" and two others, one apparently for the "fan bus" that powers the fan in all modes and one for the "compressor bus" that powers the compressor when the control calls for A/C and Defrost. I have three problems with the A/C and Fan spade connectors: 1) They look like they have never been connected to anything. 2) I don't know which is which and 3) there is a "tab" in them that prevents a female connector from being inserted on them. I can figure out which is which with a continuity checker, but where did the fan and compressor wires connect to the control unit originally? It looks like, if the #14 brown wire from the fuse block connected to the center spade, there would have been a spade connector with a short #14 brown wire going to the switch. The wires on the switch had been cut before I appeared on the scene, so I have no way of knowing how it was wired originally.
I want to put this back according to the MM in case a subsequent owner has to fiddle with it.
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