600SEL (140.057) V12-6.0L (120.980) (1993)
Thermostat: Description and Operation
Fig. 25 Thermostat
Thermostat is attached to cover to prevent rotation, Fig. 25. Thermostat starts to open when coolant temperature reaches 189°F. Thermostat
housing is in left and righthand outlet fittings, each joint sealed with an O-ring.