a/c wiring trivia challenge

[treed2 at wsu.edu (T. Reed)]

Thanks, Don. That looks exactly like the wiring that I ended up 
re-creating from memory tonight.  It's good to now know for sure that 
there was no third connector on that harness that went someplace I 
couldn't remember.

The increased load at idle seems to be compensated for by CIS-E through 
mere closed-loop action.. either that or there is undocumented wiring 
lurking somewhere deep in the engine harness.

And by the way, my A/C is working now..! But, it remains to be seen how 
well and for how long. It was a lot more work than I anticipated to put 
everything (that came out so easily) back in.

-Toby

On Sat, 15 Jul 2006, Don Walter wrote:

> Toby,
> Here is a picture of the compressor that I hope helps you.  I have many more
> that I can email and post on Allyn's site later today.
>
>
> On 7/15/06, T. Reed <treed2@wsu.edu> wrote:
>> 
>> I'm trying to put my a/c back together after I gutted it and put it in
>> to storage a couple of years ago.
>> 
>> I tracked down the little guide piece I was missing that interfaces the
>> thermostat with the hot-cold slider in the hvac controls, but I still
>> haven't found the wiring harness that connects the a/c compressor to the
>> idle stabilizer valve and low pressure switch. I either threw it away or
>> left it behind when I moved.
>> 
>> It looks like I'll have to recreate it, which shouldn't be too hard.. if
>> I can find the connectors it's supposed to attach to.
>> 
>> IIRC, the compressor clutch was grounded with a short brown wire to the
>> alternator case. The positive side of the connector should lead to one
>> terminal on the low pressure switch; its other terminal should connect to
>> a green wire coming out of the harness that I am not missing (which goes
>> through the thermostat switch and then ignition power).
>> 
>> Here's what I can't figure out, though.. the compressor clutch gets
>> powered when the thermostat closes and there is adequate pressure in the
>> system. According to the Bentley, the idle speed stabilizer valve also
>> gets power at the same time as the clutch. That makes sense because more
>> fuel is going to need to be burned to keep the idle the same with the load
>> of the compressor.
>> 
>> This power supposedly arrives through a small-diameter green wire. My idle
>> stabilizer valve has 3 wires and none of them are pure green, so I have no
>> idea how to wire this up.
>> 
>> Is this connection already made upstream of the section of harness I'm
>> missing? Anybody know?
>> 
>> -Toby
>> 
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>> 
>
>
>
> -- 
> Don Walter - Waukesha, WI
> 1986 8V Black Scirocco (Daily Driver)
> 1984 8V Audi 4000s (RIP 2/14/2006)
> 1986 2.0L 16V TEC 2 Black Scirocco (see progress at
> http://www.cardomain.com/memberpage/708939)
> 1986 2L 16V Toronado Red Scirocco (Ben's Car)
> 1988 1.8 16V Toronado Red Scirocco (sold on 3/29/04)
> 1984 1.8 8V Pewter Scirocco (sold years ago)
> 1971 Karman Ghia (sold)
> 1969 Karman Ghia (sold)
> 1969 Beetle (sold)
>