Date: Mon, 9 Sep 2002 11:09:50 +0100
From: "Andrew Hookins" <>
Subject: Re: '93 9000CS - annoying in-dash ACC fan

Actually the sensor is a NTC thermistor in a glass package that looks like a diode. The thermistor has a nominal 10kohm resistance at 25 deg. celsius and a Beta value of 3977K. My experience is that these things age in such a manner that they indicate a higher temperature. The ACC thinking that the cabin is warmer than it actually is tends to make the cabin too cool. The thermistor is cheap (40 pence / 60 cents) and is easily replaced using a soldering iron etc. Take care when removing the sensor from the car - wait for the fan to stop spinning - otherwise an error _may_ be logged by the computer (EDU flashes up Err when you put the key in) A dealer or someone with Tech-II are your only options to clear this. As for the noisy motor, blow all the fluff out with and apply a light oil to the shaft / bearings. Should quieten it for a while. AndyH "Goran Larsson" <hohnopsamlid.invalid> wrote in message > In article <iTqe9.314$>, > Jussi Aaltonen <> wrote: > > > It's temperature sensor for cabin air. Operation principle is: Fan blows > > cabin air to heated wire and voltage drop (a function of temperature) in > > wire is measured. > > There is no heated wire in the temperature sensor. The temperature is > determined by measured the voltage drop over a normal silicon diode. > The fan is there to get a better sample of the cabin air. > > -- > G–ran Larsson

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