Cooling System Overview (M52 Tu Shown. Others Similar; Coolant Pump; Thermostat - BMW 5251 Service Manual

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Cooling system overview
(M52 TU shown, others similar)
Coolant pump
A centrifugal coolant pump is mounted to the front of the en-
gine. The belt-driven pump circulates coolant through the
system whenever the engine is running.
Thermostat
Two types of thermostats are used in the cars covered by this
manual. 6-cylinder models built up to 911 998 (M52 engine)
use a conventional mechanical thermostat. All V-8 models
and 6-cylinder models from 911998 use an electrically heated
thermostat.