Date: 6 Feb 2002 13:55:16 -0800
From: bryanjnopsamibm.com (Bryan)
Subject: Re: ventilation fan speed (inbetween settings)


Johannes H Andersen <johsnopsamanytime.co.uk> wrote in message news:<3C617F3D.50D52A0Anopsamanytime.co.uk>... > danny wrote: > > > > Johannes H Andersen wrote: > > > > > Bryan wrote: > > > > > > > > danny <dannynopsamia-esprezzo.com> wrote in message news:<3C5F09EC.BFCEE2EDnopsamia-esprezzo.com>... > > > > > Bryan wrote: > > > > > > > > > > > I have a 9000cs 93 model with standard aircon (not climate control). > > > > > > What frustrates me is fan settings 1 & 2 are quite low (fine in winter > > > > > > but useless in Summer), while switching to setting 3 gives adequate > > > > > > summer ventilation but hurricane-like noise. Essentially the fan > > > > > > speed gap between setings 2 & 3 is too large. Does anyone know if it > > > > > > is possible to either crank up setting 2, or reduce setting 3 so that > > > > > > an acceptable level of airflow can be achieved without all the noise? > > > > > > I expect that it is just rheostat that the dial operates. Has anyone > > > > > > tried this or does anyone know how to remove the fan speed dial to see > > > > > > what's behind? > > > > > > thanks > > > > > > Bryan > > > > > > > > > > My 1990/91 9000CD has a four speed fan, not sure how it differs from yours > > > > > (mine has aircon, no climate control). There isn't a rheostat - in the > > > > > bulkhead (easily accessed from the engine bay under the plastic tray) is > > > > > the fan motor with a plug in unit that contains resistance wires for each > > > > > speed (no resistance for top speed), together with the thermal fuse. It > > > > > would be possible to change the length of a resistance wire and thus alter > > > > > the fan speed, if you could work out how much to chop off! For your > > > > > convenience I've added a page to my site below (www.gaggia-espresso.com) - > > > > > follow the Saab 9000 link for pictures of the resistor pack location. > > > > > This may not apply to your vehicle as some 9000's have the fan control in > > > > > an awkward location (in the dash, I believe?). > > > > > > > > Thanks Danny, > > > > Mine also has 4 speeds. It looks easier than I anticipated. I can > > > > just buy / make extra resistance wires and replace with the existing > > > > number 2 & 3 resistors till I get a better combination. > > > > Thanks again > > > > Bryan > > > > > > The resistors consume considerable power and are dependent on cooling > > > from the airflow. make sure the resistors are sufficiently rated. > > > > > > Johannes > > > > That's part of my theory of why the thermal fuses are prone to blowing. I think that the resistor pack > > gets too hot before positive airflow has been established by the fan. Since renewing the thermal fuse > > when it went on mine, I now always turn the fan straight to full, then back to the desired setting, in > > the belief this will get the air moving before using the resistors. > > > Goodone! Setting 3 is especially bad as it divides the power about equally > between the resistor and the blower motor. I'm quite happy with the settings, > but four settings will always make someone unhappy. I would rather keep the > settings as is, but introduce an extra dampening resistor in series on a > switch (if I can find place for it). > > Johannes 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

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