Ventilation Fan Stuck on Hi 1994 CS

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James Peacock - 16 May 2005 12:50 GMT

The ventilation fan for the heat/ac is always on hi, even when the of
button is pressed. Automatic mode lowers the speed somewhat, but
can't turn off the fan unless I remove the fuse or turn off th
ignition. This is a 1994 Saab 9000 CS. I ran the calibration sequence
but that did not work

--
James Peacoc

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yaofeng - 16 May 2005 13:44 GMT

Your fan control is shot. It is mounted on the driver side of the
evaporator housing.

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ajs - 18 May 2005 19:52 GMT

This is what I found on the problem that I have as well.
http://www.quasimotors.com/transistor.htm

> The ventilation fan for the heat/ac is always on hi, even when the off
> button is pressed. Automatic mode lowers the speed somewhat, but I
> can't turn off the fan unless I remove the fuse or turn off the
> ignition. This is a 1994 Saab 9000 CS. I ran the calibration sequence,
> but that did not work.

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D. Czapski - 21 May 2005 22:21 GMT

Hi,
When transistor is shot you actually would have your fan off all time. I
went through this. On the other hand, I do not know what happens when
transistor fries to ON state.

Don

> This is what I found on the problem that I have as well.
> http://www.quasimotors.com/transistor.htm
[quoted text clipped - 4 lines]
>> ignition. This is a 1994 Saab 9000 CS. I ran the calibration sequence,
>> but that did not work.

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