KTM 990 Adventure R USA 2010, Owner'S Manual

Page: 152 / 225

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)
0 2 2
0 3 3
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.