[s-cars] wonky temp gauge

[David Forgie]

Ron: Most likely your problem is the Multifunction Temperature Switch (MFTS).

Information about the purpose of the MFTS in an AAN vs a 3B is discussed here:

http://forums.audiworld.com/s4s6/msgs/148742.phtml

You can confirm that your problem is the MFTS by checking the coolant temp against
Channel 51 on the Climate Control data.  If Ch 51 says 89 deg C and your gauge says
something a lot lower, then its the MFTS (which is really the temp gauge sender).  If 
Ch 51 also reads low, then your thermostat is stuck open.

Accessing the Climate Control is done by following the instructions here:

http://www.audiworld.com/tech/int5.shtml

Once you have it figured out and it is the MFTS, the Part No. is beside No. 16 in
the diagram in this link:

http://forums.audiworld.com/s4s6/msgs/193770.phtml

A MFTS replacement DIY is available at:

http://forums.audiworld.com/s4s6/msgs/56799.phtml

Hope that helps.

Dave F.