Coolant sensor in Tee on lines going to heater core (95 S6)

[DeWitt Harrison]

On Thu, 7 Sep 2017 22:52:56 -0600
Peter Golledge <petergolledge at gmail.com> wrote:

> The tee on the coolant lines going to the heater core appears to be
leaking
> again after another 80K miles or so.  I'm tempted to bypass this plastic
> mess completely with some fresh silicone hose, from block nipple to vacuum
> valve.  Anyone recall if the sensor does anything other than tell the HVAC
> what temp the coolant is?  P/N for sensor is 025906041A used in a bunch of
> VAG stuff but I'm not finding details on its purpose for the S-cars.

A quick look at the inscrutable shop manual for the '95 S6 shows that there
is a temperature sensor "in the coolant line behind cylinder head" which,
the wiring diagrams apparently call "G62." This is an input to the ECU. I'd
say pull the plug and look for error codes.

DeWitt Harrison
Boulder, CO
Project 44