Completely different principle I'm afraid. The 75/ZT systems, including the temperature gauge, operate digitally. This means 'electronic data' are sent over shared, multichannel 'buses' rather than by the old analogue, electromechanical way.


TC

Before global warming :D
When cars were cars and men were not afraid!

The 75/ZT systems are actually partially digital, this principally being intercommunication between ECUs (including the instrument pack). Otherwise there are still a large number of electromechanical and analogue devices to be found. In the case of the temperature gauge, the 75/ZT's coolant sensor is a thermistor (just like the part fitted to David's SD1 built over thirty years ago). Its output is analogue as far as the ECM.

Simon

I thought I would provide an update. Upon further investigation coolant was found in the V of the engine due to a leak in one of the pipes close to the thermostat. A thermostat kit was purchased from Rimmer Bros and so far, the problem appears to have gone away. It will slowly reach 100 degrees in heavy stop start traffic and the fan cools it to 94 quickly. Normal operating temperature is in the region of 89 to 93. Fingers crossed it continues to behave.

Can only speak for the 1.8t - but a few years ago my first inkling something not quite right was the 2 speed cooling fan running when the car was parked and engine off - had A leaking IMG.

I can honestly say, this is the only problem I DIDN'T have with my SD1 :icon_redface: