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.
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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)
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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.
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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:
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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).
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Fig. 444: Identifying Plug Connection, Holder And Auxiliary Water Pump
Assemble engine.
Top up COOLANT.
VENTING INSTRUCTIONS must be observed without fail.
READ NEXT:
Check BMW Diagnosis System For Excess Pressure And Vacuum (N63)
IMPORTANT: Excess pressure and vacuum lines are identified by the size of
the connection
fittings and color-coded red and blue and must not be mixed up with each
other.
Build up pressure with Blue c
Removing And Installing/Replacing Left Intake Plenum (N63)
Necessary preliminary work
Remove left INJECTION PIPE.
Remove THROTTLE VALVE
Release screws on intake plenum from above without fail before lowering
front axle.
Secure ENGINE in installation po
SEE MORE:
Brake Booster
REMOVING AND INSTALLING OR REPLACING BRAKE BOOSTER
Necessary preliminary tasks
Read and comply with GENERAL INFORMATION
Remove rear left DOME CROSS-BRACE
Remove left footwell trim
On vehicles with coolant expansion tank in side panel, front left:
Remove coolant filler neck
After completing
Replacing Water Valve For Heater (N63)
Notes
WARNING: Scalding hazard!
Work on the cooling system may only be carried out when it has cooled
down.
NOTE: Clamp off coolant hoses on water valve.
Recycling
Coolant emerges when coolant lines are detached. Have a suitable collecting
container ready.
Catch and dispose of escaping coolant.
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