my temp gauge doesn't work!

[rocketdog]

the temp gauge on 91 s2 only works intermitently. does anyone have any ideas?

[Jamo]

Faulty MTFS sensor in the coolant rail or dodgy connection in the instrument cluster.

[nikmay]

Coolant gauge

Mine on my 91 3b was the same, it was a loose connection on the sender unit. From front of car right hand side under inlet manifold. It looked ok to look at but one of the wires was slighlty loose in the sender unit plug. Gave it a bit of a squeeze with some snipe nose pliers, good as new.

[rocketdog]

cheers for the tips lads, ill give your idea's a try. i spend more time under the bonnet than driving the bloody thing!!

[UrS4boy]

the temp gauge on 91 s2 only works intermitently. does anyone have any ideas?

Most likely the F76 Multifunction Temperature Switch (MFTS) aka the Electronic Thermal Switch (4 pin) not the two pin F98 Coolant Pump thermoswitch, as shown in the diagrams in this G62 Coolant temp senser/MFTS-related post:

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