The 2.1 in 2wd models uses rubber o-rings for both.

The 1.9 and Syncro with 2.1 use metal washers/rings for both.

Mark

John Reynolds wrote:
> Can anyone tell me if the coolant gauge temperature sensor (in thermostat housing - not the level sensor in the expansion tank) uses an O-Ring?   I' can't tell if this sensor and it's cousin for the fuel injection make direct contact with coolant and need a o-ring of some sorts.
>
> John
>