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4000 relay clicking with a/c turned on

Most likely low refrigerant. The clutch cycles to prevent evaporator freeze
but if the cycling is excessive because of low side pressure it means low
charge. High side cycling because of excess refrigerant or plugged condenser
is possible but not likely.

Bob Cummings
87 Coupe GT

>Date: Thu, 25 Mar 1999 14:15:46 -0500
>From: "Thomas, Nathan" <nthomas@imps0014.us.dg.com>
>Subject: 4000 relay clicking with a/c turned on
>Whenever I turn the a/c on in my 1985 4000S Quattro there is
>an audible clicking sound every 1 - 2 seconds emitted from what
>sounds like the instrument cluster.  It sounds like an electric
>relay opening/closing.  When it occurs there is an ever-so-slight
>loss in power to the engine- I can't even feel it by the seat of my
>pants, but I can see and feel the gear shift buck a little as the 
>engine lets off for a split second.  Does this sound familiar to 
>anyone?  Any advice you can give on what causes this and if
>there is anything I can/should do to make it go away is much