Date: Wed, 06 Feb 2002 23:01:40 +0000
From: Johannes H Andersen <johsnopsamanytime.co.uk>
Subject: Re: ventilation fan speed (inbetween settings)


Bryan wrote: > > Johannes, > You made the comment 'make sure the resistors are sufficiently rated > '. How do I know & check the rating? > The current settings are fine in the Australian winter (setting 1 & 2 > is all I need then), but in summer I find that 2 is inadequate. > Settings 3 & 4 are fine for when you just get in a hot car, but too > noisy for continuous driving. Maybe the resistance on my setting 3 is > incorrect but it is very similar to 4 and a big gap away from 2. We > get hot summers here. > cheers > Bryan Look in http://www.groups.google.com. I have once written about the resistors in a thread: "SAAB 9000 ('89) Heater Controls" in the news group uk.rec.cars.maintenance. I did some some calculations while the other poster "mymatetrevor" did the measurements. It turned out that the dissipation in the resistors are of the order 30-40 Watts! The actual resistors are rated much less than that and rely on the airflow for cooling, hence they can sometimes blow in hot weather. Other cars have similar blower-resistor problems. The setting 2 appears the be the quiet setting, whereas setting 3 is noisy but bearable. My guess is that it might be difficult to find an intermediary position that is also quiet. But this is up to you. Johannes

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