Date: Sun, 08 Jul 2001 19:13:42 +0100
From: danny <>
Subject: Re: AC problem

If the aircon compressor was starting to seize you'd get those symtoms - as it temporarily seized the belt would slip slightly (giving the squeal) and the additional strain would cause the engine to jerk or stutter as you describe. Not sure if the clutch on the compressor can also have this effect? Not sure about affecting the car only above 50mph though, unless you are in top gear and therefore lower revs than you would be at a lower speed higher gear/revs. Have you watched the operation of the compressor whilst idling/stationary? It is maybe possible also that the fan is seizing occasionally, which may produce a noise, but this shouldn't affect engine revs. Regards, Danny (a purely hobby site) swap Z for above characters in email address to reply wrote: > Hi, > > I have a Air Conditioner symptom/problem that I am trying to identify > and hope that the group can help. > > I have a 1993 900 Turbo (about 70k miles). It runs great except for > one small thing when the air conditioning is running. Every so often > (once every couple of minutes or so) it will make a quick, sharp > squeak-like sound. When it does this, there is a slight (almost > imperceptible if you are on a bumpy road) jerk or stutter to the car. > > This is an intermittent phenomenon. It only happens when the Air > Conditioning is on. It is most noticeable when the car is running at > speeds over 50 mph. My mechanic (who probably thinks I am crazy) has > been unable to detect it on repeated tests, possibly because he drives > it over bummpy roads. > > My questions: > > Any clue as to what is causing this? > (it would be nice to be able to give the mech. a specific thing to > look at) > > Is it a "needs immediate attention becuase when it gets worse it could > really screw things up" kind of problem or should I wait until gets > worse so that less-obsesive individuals can actually detect it? > > Any insight would be most deeply appreciated. Thanks much for your > time. > > Regards, > > Al --

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