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 Tue, 20 Feb 2018 13:28:51 Share Post by Email
In Reply to: Re: ACC question, Simon S, Tue, 20 Feb 2018 12:53:27
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If you're really unlucky then both the cabin temp sensor and the air mixer sensor have issues.

Two white wires exit the air mixer sensor for a few inches and connect to the green/red wires that continue on to the ACC2. I would expect the point where the wires connect (white to green/red) to be insulated. But suppose there is no insulation or the insulation has decayed resulting in metal-to-metal contact. Then the ACC would get a reading of very low resistance which it interprets as a hot plenum. Hence the command to turn the blower on high.

The cabin temp sensor depends on a tiny fan to draw air from the cabin and blow it over a thermal sensor. Where you have air movement you get dust accumulation. You can determine whether your fan is working by very gently inserting through the sensor's opening a long wood toothpick with the ignition on. You'll hear it and feel it when the tip of the toothpick contacts the turning fan blades. If there's no evidence the fan is turning then remove the sensor, brush off the accumulated dust, then use a pindrop oiler (the tip of a small nail or needle will do) to apply a tiny drop of synthetic oil to lube the fan. Synthetic oil won't mess up the fan's plastic like dyno or semi-synthetic can. I did this 10 years ago using Mobil 1 5w20 synthetic when the tiny fan made a big noise. The sensor has worked well and quietly ever since.

->Posting last edited on Tue, 20 Feb 2018 13:31:45.
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