Air Conditioning woes

[Mike Miller]

It could be a bad Multifunction Switch. Bentley has a procedure for
troubleshooting.

mike miller

----- Original Message -----
From: <Djdawson2 at aol.com>
To: <200q20v at audifans.com>
Sent: Thursday, May 30, 2002 9:13 PM
Subject: Air Conditioning woes


> Hi all,
> Looking for a little help/advice.  Just recently bought my 200 20v, and
now
> that it's getting hot... time to troubleshoot the inop AC.
>
> I'm not getting voltage to the compressor clutch.  I've checked both the
high
> and low cutout switches, no problem there.
>
> I jumped voltage to the compressor, works fine and actually blows very
cold
> air.  Pressures are good, about 250 hi side and 36 low side at idle.
That's
> a plus!
>
> I attempted to trace the voltage supply line for the clutch back to its
> relay, and there is where I ran into trouble.  Bentley says position 4 on
the
> aux relay panel.  I'm looking at the panel above the clutch pedal, right?
> Relay 4 is that noise-maker for door ajar/key in...  So I checked relay 5,
> just to 4's right, and that is the lamp warning relay, just as indicated
in
> Bentley.  So I'm pretty convinced I'm looking at the correct position, but
> the wrong relay.
>
> Is it possible the ac relay is located elsewhere?  Any BTDTs?  Shortcuts
> maybe that might cause a "no voltage" situation at the comp clutch?
>
> Any help would be greatly appreciated.
> TIA,
> Dave
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