Partially removing the coolant expansion tank

WARNING: Hot surfaces. 
Risk of burning! 

• Perform all work only on components that have cooled down.

NOTE: RISK OF DAMAGE 
Injectors contaminated with coolant. 
Damage and failure of injectors that have been wetted with coolant for a long time. 

• Covering injectors with suitable auxiliary materials before testing or topping up the coolant is mandatory.
• Always cover injectors with suitable aids before working on the cooling system in the vicinity of the injectors.
• If necessary, draw off all of the coolant from the coolant expansion tank.
• Always clean injectors or injector shafts contaminated with coolant (e.g. with compressed air).

NOTE: TECHNICAL INFORMATION 
Collect and dispose of emerging fluids. Observe country-specific waste disposal regulations.

• Loosen screws (1).
• Unlock plug connection (2) and disconnect.

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• Prepare a standard waterproof rubber mat (1).

  Letter:	Dimension in cm
  A	32.00
  B	52.00

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• Unclamp the coolant hoses with clamping pliers (3).
• Raise coolant expansion tank (2).
• Position the rubber mat (1) between the expansion tank and the cylinder head cover.
• Unclip the fuel lines in area (4) from expansion tank (2).

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• Ensure that the rubber mat (2) covers the areas between expansion tank (1) and the cylinder head cover in the area of injector shafts (3).

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• Unlock and disconnect coolant line connections (4).
• Ensure that radiator cap (2) is sealed.
• Ensure that the fuel lines are unclipped in area (3).
• Unlock and disconnect coolant lines (1).

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• Seal the connections to the coolant expansion tank with seal plugs (1) part number 17 12 8 515 062.

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• Set coolant expansion tank (1) aside.

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NOTE: RISK OF DAMAGE 
Injectors contaminated with coolant. 
Damage and failure of injectors that have been wetted with coolant for a long time. 

• Covering injectors with suitable auxiliary materials before testing or topping up the coolant is mandatory.
• Always cover injectors with suitable aids before working on the cooling system in the vicinity of the injectors.
• If necessary, draw off all of the coolant from the coolant expansion tank.
• Always clean injectors or injector shafts contaminated with coolant (e.g. with compressed air).

Courtesy of BMW OF NORTH AMERICA, INC.

CAUTION: Swirling dirt particles caused by compressed air. 
Injury hazard! 

• Collect dirt particles, e.g. when blowing out, use cloth to do so.
• Wear safety goggles.

CAUTION: Materials harmful to health. 
Contact with fluids harmful to health! 

• Note and follow safety instructions on containers.
• Conduct all work in appropriate personal protective equipment only.

• Check the injector shafts for coolant residues (1).

• If there are coolant residues (1) in the injector shaft: Clean the injector shafts with an air gun (2).