SV: Electronic Climate Control (and Coolant Temperature Sensor)

[Snoopy]

The benefits are doubtful, I've already wondered here some time ago, why the 
sensor is fitted *after* the valve, not before. As far as i've seen the valve 
does not get closed 100%, it leaves a small gap. When it's cold, CC waits for 
the sensor to heat up (~130 points on the diag channel #06), and only then 
opens it up to allow full flow to heater core.

I think it reports the "engine is warm" state more accurately, than the mfts 
sensor, which is located in the "small" heat exchange circuit.

The valve is still vacuum driven.


On 2011.12.01 15:44, Marc Boucher wrote:
> 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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