64 53 521 Replacing safety pressure switch (N63)

Refrigerant circuit is under high pressure!

Avoid contact with refrigerant and refrigerant fluid.

Read and comply with safety information:

• Handling R 134a (tetrafluorethane) refrigerant  . See 64 50... INSTRUCTIONS FOR HANDLING R 134A REFRIGERANT  or 64 50... SAFETY INFORMATIONS FOR HANDLING TETRAFLUORETHANE REFRIGERANT R134A .
• HANDLING REFRIGERANT FLUID 

Follow INSTRUCTIONS  for opening and replacing parts in refrigerant circuit.

If air conditioning system is opened for more than 24 hours: Replace dryer insert for air conditioning  See 64 53 517 REPLACING DESICCANT INSERT FOR AIR CONDITIONING SYSTEM  or 64 53 518 REPLACING DESICCANT INSERT FOR A/C SYSTEM (CAPACITOR REMOVED) 

Necessary preliminary work 

• DRAIN OFF AIR CONDITIONING SYSTEM .
• Disconnect BATTERY EARTH LEAD .
• Remove RIGHT SUSPENSION CROSS-BRACE .
• Remove right intake port.

Release screws (1).

Tightening torque 12 90 2AZ .

Remove electronics box cover (2).

Fig 1: Identifying Electronics Box Cover And Screws

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Unclip and unplug all connectors (1) from control units.

Unclip grommet hold-down device (2) and remove.

Detach rubber grommets (3) from electronics box.

Place wiring harnesses to the side.

Installation note: 

Make sure grommets are is correctly seated (watertightness).

Fig 2: Identifying Grommet Hold-Down Device, Rubber Grommets And Connectors

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Release screw (1).

Remove lead (2) from connecting piece.

Fig 3: Identifying Connecting Piece Lead And Screw

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Unfasten plug connection (1) and disconnect.

Release safety pressure switch (2).

Tightening torque 64 53 8AZ .

Fig 4: Identifying Safety Pressure Switch And Plug Connection

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After installation 

• EVACUATE AND FILL AIR CONDITIONING SYSTEM .