Re: typ44TQ: rpm's kick up whenever climate control turned on?

["Fred Munro" <munrof@isys.ca>]

As Ti noted, the RPM should only rise slightly. It may rise more if your
compressor is not carrying full load for some reason.

Fred Munro
'91 200q  281k km

----- Original Message -----
From: Ti Kan <ti@amb.org>
To: <JordanVw@aol.com>
Cc: <quattro@audifans.com>
Sent: Friday, September 24, 1999 2:18 AM
Subject: Re: typ44TQ: rpm's kick up whenever climate control turned on?


> JordanVw@aol.com writes:
> > on my '86 5kTQ, whenever i turn on the climate control (both heater or
the
> > a/c affects this) the rpm's kick way up, and only go back down to normal
when
> > i shut off the climate control.  its more apparent when idling in
neutral.
> >
> > normal rad. fan temp operation doesnt affect this, it just happens when
i
> > turn on the a/c or heater.
>
> There is an air valve that opens to increase your idle speed slightly when
> the A/C compressor runs.  The purpose is to counteract the idle speed
> drop that would occur due to the compressor's load on the engine.  The
> A/C compressor also runs when the climate control is set to defrost, even
> if the temperature is set high.
>
> The action of the valve should be subtle, though.  It should not cause
> an increase of more than 200rpms or so.
>
> -Ti
> 96 A4 2.8 quattro
> 84 5000S 2.1 turbo
> 80 4000 2.0
> --
>     ///  Ti Kan                Vorsprung durch Technik
>    ///   AMB Research Laboratories, Sunnyvale, CA. USA
>   ///    ti@amb.org
>  //////  http://metalab.unc.edu/tkan/
> ///
>
>