11 53 590 Removing and installing/replacing auxiliary water pump (N14, N18)

Special tools required:

17 2 052

Necessary preliminary tasks:

Remove FAN COWL WITH ELECTRIC FAN .
Drain COOLANT .
Remove left charge air hose. See REPLACING LEFT CHARGE AIR DUCT (N14) or REPLACING LEFT CHARGE AIR DUCT (N18) .

NOTE: To disconnect coolant hoses, use commercially available disconnect tools such as HAZET brand tools (see table).

Fig 1: Identifying Special Tools

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HAZET BRAND TOOLS DESCRIPTION

Battery earth lead
4590-1	Length of disconnect pliers (mm): 150
4590-2	Length of disconnect pliers (mm): 180
4590-3	Length of disconnect pliers (mm): 253
4590/2	Disconnect pliers set
4590/3	Disconnect pliers set

IMPORTANT: Taking into account for troubleshooting!
In some vehicles, an additional fuse (1) for the auxiliary coolant pump is installed in the vicinity of the DME control unit.

Fig 2: Identifying Additional Fuse For Auxiliary Coolant Pump

Courtesy of BMW OF NORTH AMERICA, INC.

Clamp off coolant hoses

Release hose clip (1 and 2) with special tool 17 2 052 .

Release coolant hoses from auxiliary water pump.

Disconnect plug connection (4).

Release screws (3).

Tightening torque: 11 53 3AZ .

Fig 3: Identifying Hose Clips, Screws And Plug Connection

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Vent COOLING SYSTEM .

Assemble engine.