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Joined: 08 Nov 2008
Posts: 30174
Location: Hertfordshire and Hampshire

PostPosted: Wed Mar 20, 2013 11:09 pm    Post subject: Secret True Digital Coolant Temp Gauge via Climate (996.1) Reply with quote

The analogue coolant (water) temperature gauge reads low and slow (it is buffered).

Straight through "0" of "80" is normal (and is in reality exactly 90°).

If you have a 996.1 (pre-facelift), you can try this for a more accurate monitor of engine coolant temp:

With engine turned on, using the climate control buttons press and hold the UP button then at the same time press and hold the RECIRC button in. 

After 5 seconds or so of holding the buttons the didital display changes to say 1c.

Press the + button on the temperature control (not the fan speed +) until 1c changes to 6c.

Now press the CENTRE button on the climate control below the UP button (this is the button for directing air through the centre dash vents). 

The display should now show the digital coolant temp (actually 85-92 degrees is normal, although hot weather and racing will send this close to 100 or beyond. 105+ may indicate a problem, particularly is it isn't hot weather and you aren't racing!)

To exit this mode back to normal AC mode, press the AUTO button.

The unit is a Audi part and uses some of the same data channels:

List of diagnostics options ( Audi based climate control systems):
0c - ERL
1c - Oil Temp (NA for PORSCHE)
2c - Inside Temp - From the Sensor mounted in the Aspirator Assembly at the side of the Dash
3c - Outside Temp - From the Sensor inside the Air Inlet of the A/C Unit
4c - Outside Temp - From the Sensor in Front Grill of the Radiator. Data is fed to the Climatronic from the Instrument Cluster. When not moving, the Instrument Cluster OBC Temp Display retains it's last setting until moving. This is to prevent heat emanating from the Radiator affecting the Temp Sensor. The Climatronic uses the lower of the two values in determining Fresh-Air Temp.
5c - Outside Temp - matches OBC outside temp display
6c - Coolant Temp
7c - Footwell Discharge Temp
8c - Sun Sensor (dash top)
9c - Sun Sensor
10c- Passenger Compartment Fan Speed
11c- Passenger Compartment Fan Voltage
12c- Temperature Mix Flap Command (1=COLD, 100= HOT)
13c- Temperature Mix Flap Position
14c - Central Flap Command
15c - Central Flap Position
16c - Footwell/Defrost Flap Command
17c - Footwell/Defrost Flap Position
18c - Recirculation Valve Command (1=OFF, 100=RECIRC)
19c - Recirculation Valve Position (feedback)
20c - Vehicle Speed in kph, updates once per second. This is True Speed, not the Speed+Safety Margin displayed by the Speedometer.
21c - Engine RPM in hundreds, also updates once per second
22c - ?
23c - ?
24c - Sun Sensor, Exterior Lights Switch, and Panel Lights control (term.
58 & 58d voltage) - used for A/C Panel Display Illumination
25c - ?
26c - ?
27c - ?
28c - Fan Speed
29c - ?
30c - Engine Run Time in seconds (255max.) (=0Xff)
31c - Timing Counter
32c - Displays Test
33c - Software Version (usually 3.4)
34c - ?
35c - Outside Temp from Inlet Sensor (filtered)
36c - Temp
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Graeme Shaw

Joined: 01 Jul 2012
Posts: 221
Location: Newcastle Upon Tyne

PostPosted: Wed Jun 04, 2014 3:53 pm    Post subject: Reply with quote

Just found this!
Does this work on 996.2 (Turbo)

Seeing an exact water temp would come in handy at times!

Silver 2002 996 911 Turbo
Re map
Forge diverter valves
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Joined: 08 Nov 2008
Posts: 30174
Location: Hertfordshire and Hampshire

PostPosted: Wed Jun 04, 2014 11:37 pm    Post subject: Reply with quote

Sadly, as per title, no.
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