1
2
3
Removing and installing thermostat
39
Fig. 1
D Drain coolant, see page 37
D Remove expansion tank, see page 45
Once the expansion tank has been removed the
thermostats in the water pump housing are visible.
Fig. 2
Take out thermostat.
Check the function of the thermostat as follows.
D Hang thermostat in a pot filled with water
D Heat water
D Use suitable thermometer to ascertain the
opening start and compare it with the set–point
value given in ”Engineering S Data S Setting val-
ues”.
D Measure opening stroke if necessary.
Exchange defective thermostats.
Fig. 3
Insert thermostat inserts (ball valve facing upwards
(”TOP”) with new O-ring seal (1) and new seal (2).
3428
3429
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2
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