MAINTENANCE WORK ON FRAME AND ENGINE 150
Cooling system
100608-10
The water pump in the engine forces the coolant to flow.
The pressure in the cooling system resulting from heat is regulated by a valve in the radia-
tor cap. This permits the specified coolant temperature without causing any malfunctions.
125 °C (257 °F)
400619-10
Cooling takes place by means of the air stream and a radiator fan , which is controlled by
a thermoswitch.
The lower the speed, the less the cooling effect. Dirty cooling fins also reduce the cooling
effect.
The heat expansion causes the surplus coolant to flow into the compensating tank . When
the temperature falls, this surplus coolant is sucked back into the cooling system.
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