BMW 7 Owners & Service Manuals

BMW 7 Series: Thermostat And Connections

REMOVING AND INSTALLING/REPLACING COOLANT THERMOSTAT (N63)

WARNING: Risk of scalding! Only perform this work after engine has cooled down.

Recycling

Catch and dispose of drained coolant in a suitable collecting vessel.

Observe country-specific waste disposal regulations.

Necessary preliminary work

  • Drain COOLANT.
  • Remove COOLANT PUMP.
  • Remove charge air cooler EXPANSION TANK.
  • REMOVE fan cowl with electric fan.

IMPORTANT: Risk of damage! Coolant emerges when the coolant hoses are detached from the coolant thermostat.

Cover surrounding components and plug connections with suitable apparatus

NOTE: For purposes of clarity, the graphic shows the auxiliary water pump removed.

Thermostat And Connections
Fig. 440: Identifying Plug Connection, Coolant Hose And Coolant Thermostat

Disconnect plug connection (3).

Installation note: Plug connection (3) must snap audibly into place! Unlock snap fastener on coolant hose (2).

Detach coolant hose (2) and lay to one side.

NOTE: One of the screws is not shown and is located at the rear under the coolant thermostat (1).

Release screws (4).

Tightening torque 11 53 1AZ.

Lift out coolant thermostat (1).

NOTE: The coolant thermostat is integrated in the housing cover. It can only be replaced as a complete unit!

Clean sealing surface.

Installation note:

Replace sealing ring (1)

Thermostat And Connections
Fig. 441: Identifying Sealing Ring

Assemble engine.

Top up COOLANT.

BLEEDING INSTRUCTIONS must be observed without fail.

REMOVING AND INSTALLING/REPLACING SUPPLEMENTARY COOLANT PUMP FOR EXHAUST TURBOCHARGER (N63)

WARNING: Risk of scalding! Only perform this work after engine has cooled down.

Recycling

Catch and dispose of drained coolant in a suitable collecting vessel.

Observe country-specific waste disposal regulations.

Necessary preliminary work

  • Remove charge air cooler EXPANSION TANK

Unclip coolant hose (1) from bracket (3) and lay in direction of arrow to one side.

Unfasten screws (2).

Tightening torque 11 51 4AZ.

Thermostat And Connections
Fig. 442: Identifying Coolant Hose And Bracket

IMPORTANT: Risk of damage! Coolant emerges when the coolant hoses are detached from the auxiliary water pump (3).

Cover surrounding components and plug connections with suitable apparatus

Release hose clamp (5) with a suitable tool.

Installation note:

Thermostat And Connections
Fig. 443: Identifying Auxiliary Water Pump, Coolant Hose And Hose Clamp

Replace hose clamp (5)

Detach coolant hose (4) and lay to one side.

Release hose clamp (1) with a suitable tool.

Detach coolant hose (2) and lay to one side.

Disconnect plug connection (2).

Installation note: Plug connection (2) must snap audibly into place! Lift out auxiliary water pump (1).

Release holder (3) from auxiliary water pump (1).

Thermostat And Connections
Fig. 444: Identifying Plug Connection, Holder And Auxiliary Water Pump

Assemble engine.

Top up COOLANT.

VENTING INSTRUCTIONS must be observed without fail.

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