Thanks Mark. I see the single wire laying across the top of the compressor.
The end coming from the fuel injection wiring harness is connected to the
end coming from the compressor. The two meet and lay on top of the
compressor. I suppose I could begin with a simple continuity test from one
end to the other. Does that seem like a good next step?

Ryan

On Sat, Jul 10, 2021, 10:31 vw_van_fan_Mark <madvws@cox.net> wrote:

> A first step would be to check the wiring at the new compressor.
> VW runs a single wire from the fuel injection harness over to the
> compressor clutch so the injection system can know when the A/C
> compressor is loading down the engine.
> That is how the idle control system knows when to speed up the idle for
> A/C.
> They may have simply overlooked that signal wire to the idle circuit.
>
> Mark
>
> Ryan Cresawn wrote:
> > On July 6, 2020 I hired a shop to fix my factory AC in my '91 Vanagon
> > camper with 2.1l engine. The old compressor was leaking and the shop
> > replaced it. At 11.5 months into a 12 month warranty the AC wasn't
> cooling
> > well. I returned to the shop last week. They identified a refrigerant
> leak
> > in the compressor and replaced it under warranty. I picked up the Vanagon
> > yesterday and was told that I need to hire a shop to fix the low idle
> when
> > the compressor is on.
> >
> > I drove the Vanagon home and confirmed that when the compressor was
> running
> > the idle speed of the engine would drop from around 900-950 to about
> > 600-650. The engine did not stall but it felt like it was close to
> > stalling. How should I begin to troubleshoot this issue?
> >
> > Thanks in advance,
> > Ryan
> >
>