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64 53 520 Replacing safety pressure switch

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WARNING: Danger of injury!
Refrigerant circuit is under high pressure!
Follow safety informations for handling R 134a refrigerant  . See 64 50... NOTE FOR HANDLING R134A REFRIGERANT or 64 50... SAFETY INFORMATIONS FOR HANDLING TETRAFLUORETHANE REFRIGERANT R134A .
Avoid contact with refrigerant and refrigerant fluid.
Follow safety instructions for HANDLING REFRIGERANT OIL .
IMPORTANT: Risk of damage!
Restart engine only when A/C system has been correctly filled.
Follow INSTRUCTIONS for opening and replacing parts in refrigerant circuit.
If air conditioning system is open for longer than 24 hours: replace DESICCANT INSERT FOR AIR CONDITIONING 

Necessary preliminary tasks: 

Unclip wiring harness (1).

Pull expansion tank (2) upward out of retaining bracket.

Fig 1: Pulling Expansion Tank Out Of Retaining Bracket
G09950074Courtesy of BMW OF NORTH AMERICA, INC.

Unfasten plug connection (1) and disconnect.

Installation note: 

Guide pin (2) must be fit correctly in rubber guide (3).

Fig 2: Identifying Guide Pin And Rubber Guide Plug Connection
G09950075Courtesy of BMW OF NORTH AMERICA, INC.

Unfasten plug connection (1) and disconnect.

Release safety pressure switch (2) and remove.

Tightening torque 64 53 8AZ .

Fig 3: Identifying Pressure Switch Plug Connection
G09950076Courtesy of BMW OF NORTH AMERICA, INC.

After installation: