Hi, that's what I have been doing on my 1994 9000cse today as well, troubleshooting the blower motor. My started racing up/down a few weeks ago and settled on high, then after a few days stopped working all together several days ago.

So I soldered in a new Toshiba power transitor into the blower speed controller (which is on the top of blower housing, between the cabin filter and the blower) and it started working again, until the car got towed (due to unrelated failure of idle pulley on the serpentine belt - are SAABs great or what :-). After some shaking on the tow truck the blower motor stopped working, so I debugged it today:
1. ACC voltage on the 2 thin cables from ACC controller to blower speed controller vary 8V-13V as I change the speed on ACC -
Q:is it a good range? Anyone measured it?
2. I tried to measure the controller output voltage (2 thick black cables from the blower speed controller) and ooppps, I think I swapped them accidently (they are both the same color). I measure the voltage on the gray/black pair leading to the blower 13.36V to 13.10V as I change the blower speed on the ACC buttons. Plug in the blower - alive! but runs on full speed only, even if I press the OFF button on ACC.

Q. Would it make sense that swapping of black wires on the controller output sets blower at high speed only?
Q: If you disconnect the blower what voltage range do you see on the gray/black pair going towards the blower as you vary the speed?
Q. Does anyone has schematics of connections between the blower Speed Controller and the blower? Is Gray at the blower at +12, black at ground, and the speed controller inserted into the black grounding line and there is nothing else there?

At least the blower seems to be working, so no need for another blower job which I did on my 1986 9000 years ago and it was not fun.

thanks
George

posted by 128.107.25...

• Acc problem follow-up -long, rc3saabs, Sat, 20 Sep 2003 06:57:51
  • Re: Acc problem follow-up -long, GeorgeS, Sat, 20 Sep 2003 22:32:51 <-- Viewing This Message
    • Controller throttles the grd side of the motor, so=, Lu, Sun, 21 Sep 2003 07:36:33
      • Re: Controller throttles the grd side of the motor, so=, GeorgeS, Sun, 21 Sep 2003 16:35:50
        • Not displayed in book but open controller, Lu, Sun, 21 Sep 2003 20:28:47
  • How did you jump the bat to motor?, Lu, Sat, 20 Sep 2003 08:23:28
    • Re: How did you jump the bat to motor?, rc3saabs, Sat, 20 Sep 2003 13:41:58
      • Acc problem- more follow-up, rc3saabs, Sat, 20 Sep 2003 14:53:18
        • You bumped the brushes into reseating. Bad Mtr., Lu, Sat, 20 Sep 2003 21:44:52
          • JUST to make sure. Voltage on motor leads?, Lu, Sat, 20 Sep 2003 21:45:43
            • Re: JUST to make sure. Voltage on motor leads?, GeorgeS, Sun, 21 Sep 2003 08:34:01

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