64 11 273 Replacing water valve for heater (S63)

Special tools required: 

• 17 2 050
• 13 5 160

Recycling 

Coolant emerges when coolant lines are detached. Have a suitable collecting vessel ready.

Catch and dispose of escaping coolant.

Observe country-specific waste disposal regulations.

Necessary preliminary tasks: 

• Remove LEFT INTAKE SILENCER HOUSING

Unfasten tank ventilation line (1) and disconnect.

Set the tank ventilation line (1) aside.

Fig 1: Identifying Tank Ventilation Line

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Unlock and disconnect fuel delivery line (1).

Fig 2: Identifying Fuel Delivery Line

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Seal fuel lines with special tools (1) 13 5 160 and (2) 13 5 162.

Fig 3: Sealing Fuel Lines Using Special Tools

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Unscrew nuts (2).

Tightening torque 32 41 2AZ .

Remove the oil reservoir (1) and set aside.

Fig 4: Identifying Oil Reservoir And Nuts

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Release hose clips (1) with special tool 17 2 050 and remove coolant hoses.

Disconnect plug connection (2).

Pull water valve (3) upwards out of holders.

Installation note: 

Do not  mix up connections of coolant hoses.

Replace damaged coolant hoses.

Fig 5: Identifying Water Valve, Plug Connection And Hose Clips

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Installation note: 

Make sure rubber mount (1) and guide lug (2) are securely seated in holders (3) on wheel arch body.

Fig 6: Identifying Holders, Guide Lug And Rubber Mount

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After installation: 

• BLEED AND FILL cooling system.
• Check for LEAKS .