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D2 A8/S8 (1997 - 2003)
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You can pull up coolant temp on the HVAC display in diagnostic mode
Posted by: JFrahm (4193) on 2018-01-27 13:38:04
In Reply to: I had feeling I was right. posted by semso55 on 2018-01-27 13:19:25

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I think this is correct:
http://www.wak-tt.com/tt/climatecontcodes.htm

You can probably use the Torque app also and the $4 bluetooth interface.
$4 from Malaysia ELM327 off ebay. Also I have been real curious about the OBD2 heads up displays for $20 or so.
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