Thermostat. Removing And Installing (M52Engine) - BMW 5251 Service Manual

170-1 6
I
Radiator and Cooling
System
-
Remove fan and fan shroud mounting fasteners. Slide fan
and fan shroud downward to remove.
-
Reinstallation is reverse of removal.
Thermostat, removing and installing
(M52 engine)
The coolant thermostat is installed in a housing at the front of
the engine.
-
Drain coolant from radiator and engine block. See Coolant,
draining and filling (6-cylinder models).
WARNING
-
Allow the cooling system to cool before opening or draining
the system.
-
Remove mechanical cooling fan and fan shroud. See Me-
chanical (viscous clutch) cooling fan, removing and in-
stalling.
-
Disconnect coolant hoses from thermostat housing.
-
Remove thermostat housing from front of engine.
-
Remove thermostat. Note thermostat direction and orienta-
tion before removing.
-
Installation is reverse of removal, noting the following:
-
Use new O-ring and gasket(s) when installing thermostat
and housing.
NOTE-
Some thermostats have a direction arrow or vent hole near
the edge. Install the thermostat so that either the arrow or
hole are at the top.
Fill system with coolant as described in Coolant, draining
and filling (6-cylinder models).
CAUTION-
Be sure to reconnect ground wire@) at thermostat housing
mounting bolt, where applicable.