SV: Electronic Climate Control (and Coolant Temperature Sensor)

[Marc Boucher]

Any idea what the benefits would be to the later sensor?  The climate 
control is already driven by the indoor temperature sensors vs the 
temperature that the driver selects.  Would it lock out coolant flow until 
it gets to a certain temperature?
Also any idea of the ease of retrofitting the valve with sensor?  If the 
climate control is already built for it, would seem a question of getting 
the wiring from the new sensor to the climate control.

Does the new one also control the flow via the wiring, or is it still vacuum 
operated and the wiring just provides the temperature feed?

--------------------------------------------------
From: "Dag Bøsterud" <dag.boesterud at little-e.com>
Sent: Thursday, December 01, 2011 5:04 AM
To: "'Marc Boucher'" <mboucher70 at hotmail.com>; <quattro at audifans.com>
Subject: SV: Electronic Climate Control (and Coolant Temperature Sensor)

> Late cars have a different heater valve that incorporates this sensor.
>
> /Dag
> 1990 Audi 100 Turbo Quattro Sport Exklusiv
>
> -----Opprinnelig melding-----
> 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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