SV: Electronic Climate Control (and Coolant Temperature Sensor)

[Dag Bøsterud]

Late cars have a different heater valve that incorporates this sensor.

/Dag
1990 Audi 100 Turbo Quattro Sport Exklusiv

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Fra: quattro-bounces at audifans.com [mailto:quattro-bounces at audifans.com] På
vegne av Marc Boucher
Sendt: 1. desember 2011 06:50
Til: quattro at audifans.com
Emne: Electronic Climate Control (and Coolant Temperature Sensor)

Looking further into various temperature sensors, I noticed that the
electronic climate control has a number of outputs for temperature readings
when set into diagnostic mode.   One of these, the value on 'channel 06'
displays the following 'value' (according to Bentley): "Coolant temp..phased
in production 255 - open circuit."

Sure enough, mine reads 255.  

I'm wondering...on the cars that DID have the coolant temperature already
phased in, from which sensor did they get the coolant temperature?  Was an
additional sensor added to accommodate this, or did they read the value from
the MFTS, or from the ECU coolant temperature sensor?
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