900 se 2.5V6 ACC problem

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Richp - 06 Jul 2006 08:31 GMT

Hi

Just bought a very low mileage 1995 900 se 2.5 V6 Auto (1st 900 but 5th
Saab) and all seemed fine at 1st. Last week or so came out and battery
was dead although weather in London very hot. Charged battery and
refitted but then noticed a whirring sound even with the ignition off.
Found this to be coming from behind the interior sensor for the ACC. I
am sure that this is draining the battery but do not know what the
problem is. ACC is not blowing out cold air so needs a regas but do not
know why this whirring noise continues even with engine off. Did the
calibration bit as listed in the manual but still the same.

Any ideas greatfully received.

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Fred W - 06 Jul 2006 12:59 GMT

> Hi
>
[quoted text clipped - 9 lines]
>
> Any ideas greatfully received.

Good Luck to you. You seem to have picked a car out with the options
that everyone around here rails against. The dreaded GM V6 engine and
an automatic transmission.

The whirring noise is probably from the small fan that blows air over
the cabin temp sensor. These generally do run on for a while after the
car is turned off, but should eventually time out.

You can do a current drain test by hooking an ammeter up in series with
the battery ground lead (disconnect negative lead and make the
connection with the meter) while the car is *off*. Observe how much
current there is and then start pulling fuses until it drops
significantly. Figure out what is powered by that circuit and you will
have isolated the fault like a pro.

Guessing, rather than troubleshooting, can get rather expensive...

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-Fred W

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