Water Pump - Subaru LEGACY 2002 Quick Reference Index

Cooling

3. Water Pump

The water pump is located in the front portion of the left bank cylinder block and is driven by the
engine through the timing belt. The thermostat is fitted into the coolant inlet at the bottom of the
water pump. When the pump's impeller rotates, the coolant is drawn into the pump from the lower
pipe (which is connected to the radiator hose) via the thermostat. It then flows along the perimeter
of the impeller and then is discharged for circulation through a circuit depending on the coolant
temperature.
(1) Pulley
(2) Ball bearing
(3) Mechanical seal
(4) Impeller
(5) Thermostat
(6) Thermostat case
WATER PUMP
A
B
A: From bypass and/or heater circuit
B: From radiator (when thermostat is open)
CO-4
H2H2324D