Re: ACC question - Saab 9000 Bulletin Board - Saabnet.com


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Re: ACC question
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Posted by sam96CS [Email] (#852) [Profile/Gallery] (more from sam96CS) on Wed, 21 Feb 2018 09:59:27 Share Post by Email
In Reply to: Re: ACC question, skibumm100, Wed, 21 Feb 2018 05:06:55
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I've never looked for the blended air temp sensor. If I understand correctly you pull the ACC out then look inside to the right at the ductwork for the sensor. It is about 1 inch by 1 inch and held to the duct with plastic tabs. It has a long probe like a cooking thermometer that you'll see when removing it from the duct. Two white wires run from the sensor to a plug located above and to the left of the sensor. Townsend Imports has a page where you can see what the kohms resistance should be at various temperatures.

I would do these steps before taking things apart:
• Erase owner ACC programming by pressing and holding both the AUTO and OFF buttons for at least 20 milliseconds. It is possible the system is starting with the fan on high because somebody programmed it to do that.
• Run the ACC diagnostic/calibration with the engine running by pressing and holding AUTO and <=> buttons until the process starts. It takes about 30 seconds to run, and during that time the display will read either '0' or the number of faults the ACC system finds, between 1 and 5. It will check all 4 sensor inputs and the servos operated by the ACC. It would be nice to know if the ACC controller agrees with our suspicion that 1 or more sensor inputs aren't working.

You can program the ACC to start the fan slow at startup automatically regardless of what it would do ordinarily in AUTO mode. The system will run the way that you program it until you override it by pressing AUTO, ECON or OFF. This is documented vaguely in the owners manual and more clearly at Townsend's site. Here's the procedure in a nutshell:
• Use the manual controls to make whatever selections you desire at startup.
• Press the DEF (top right) and Vent (bottom right) buttons at the same time for at least 20 ms.
• The temperature display extinguishes for a short period confirming the selection.
• The system will continue to operate with the chosen selections active.
• The next time you start the engine your programmed selections will activate and remain activated until you press AUTO, ECON or OFF. So for example you start the car and your programmed settings take over. Then when you see the temperature gauge climbing press AUTO to let the ACC system crank up the heat.
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