Date: Mon, 11 Nov 2002 09:34:20 -0600
From: "Walt Kienzle" <>
Subject: Re: A/C Compressor - Engine Load

The A/C compressor does turn on and off "suddenly" on a regular basis, so that part of the operation is normal. Having the engine speed drop a little when the A/C is operating is also normal. But if the "substantial load" it puts on the engine is objectionable, it may be an indication that the A/C system has too much or too little lubricant (yes, there is a special type of oil in the A/C system). Another possibility is that the compressor is going bad and is about to need replacement. In any case, it is probably appropriate to have a specialist look at your specific circumstance. Walt Kienzle 1991 9000T "tCowjww" <> wrote in message news:aqodsr$n10$1$ > On my 1996 900S 2.3i I have noticed that the A/C compressor > places substantial load on the engine, and I was wondering if it > is normal on this model for the compressor to cut in quite so > suddenly and produce quite a loud humming sound? > > Whilst I appreciate that A/C does use a fair bit of engine power, > I have never noticed the load being placed on the engine so > abrubtly on other cars (including the 9^3). Is it a characteristic > of this model or perhaps a warning of impending problems? > > The system still produces plenty of cold air, but I have no idea > how well the system has been maintained by its previous owners. > > Is it advisable to get the system fully discharged and recharged > annually as the dealer recommends (at a cost of 100ukp)? > I don't mind spending the cash as long as it's worthwhile > preventative maintenance. > > Many thanks for any advice, > Tim. > >

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