Drain coolant.
Remove the water hoses from the radiator.
Remove the radiator fan dare with the diffuser.
In production models before December 1980, unscrew the nuts at the rubber supports at the bottom of the radiator on the right and left with a wrench; pull out the retaining clips upwards.
On models after January 1981, both radiator retainer bolts must be removed.
Remove the heatsink: in models manufactured after January 1981, the heatsink is attached to the bottom of the fixing lugs (with threaded gasket).
If necessary, unscrew the thermostatic switch.
Screw on the thermostatic switch with a new O-ring. The tightening torque is 25 Nm.
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