64 12 500 Removing and installing or replacing complete heater

WARNING: This page is about a different variant/trim than selected.

M57 only:

Remove air guide from fuel cooler.

Loosen screws (1).

Fig 1: Detaching Fuel Cooler

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Detach fuel cooler (3) in direction of arrow from guide (2) and place to one side.

All:

Disconnect plug connections (1) to (3).

CAUTION: To avoid damage during installation, it is absolutely essential to adhere to the following contacting sequence for the plug connections:

Plug connection (1)
Plug connection (2)
Plug connection (3)

Fig 2: Disconnecting Plug Connections
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Unfasten hose clip (1).

Fig 3: Detaching Intake Hose

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Detach intake hose (3) in direction of arrow from heater (2).

Release screws (4).

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

Detach fuel line (1) from heater (5).

Fig 4: Detaching Fuel Line From Heater

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Release hose clamp (3).

Detach water hose (2) from heater (5).

M57 only:

Release screw (4) and remove retaining fixture with centering for fuel cooler.

Installation:

Make sure retaining fixture with centering for fuel cooler is correctly seated.

M54, M62 only:

Release screw (4).

All:

Detach exhaust hose (6) in direction of arrow from heater (5).

Lift heater (5) upwards.

Unfasten hose clip (2).

Fig 5: Unfastening Hose Clip

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Detach water hose (1).

Lift out heater.

Installation:

Replace gasket (3).

Make sure exhaust hose (4) is correctly seated on flange of heater (5).