Air Conditioning woes

Bernie Benz b.m.benz at
Fri May 31 12:01:49 EDT 2002


Relay locations.  The Aux Relay Panel as shown on pg 531 is confusing in
that it is shown upside down and is wrong in relay numbering and ID, at
least relative to the actuals in my car.  This panel in my car is closer to
that of the '90 200 as is shown on pg.333.  Anyway, the the AC relay (mine
is marked #295, but other versions were also used, like #306) is in the
center row, end position, opposite the connector end.  This relay should
opperate if you force the signal from the AC Programer high.  Or pull the
relay and jumping the socket contact terminals should force the clutch to
run all the time, when engine is running.


> From: Djdawson2 at
> Date: Thu, 30 May 2002 23:13:10 EDT
> To: 200q20v at
> 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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