Refrigerant Circuit, General Precautions: O-Ring

Only O-rings that are resistant to refrigerant R134a and the associated refrigerant oil may be used. Color coding of O-rings is no longer employed. Colored and black O-rings are used.
Ensure inner diameter on seals used is correct.

Refer to the Parts Information.

O-rings may only be used once.
Before installing, coat the O-rings lightly with refrigerant oil (PAG oil).

NOTE:

When flushing components with compressed air and nitrogen, always extract the gas mixture escaping from the components with suitable extraction units (workshop extraction system).

After engine all service work, screw sealing caps (with seals) onto all connections with valve and service connections.

Before starting up A/C system. Pay attention to the vehicle-specific filling capacities. Refer to REFRIGERANT R134A CAPACITIES .

Do not fill refrigerant, extract the refrigerant present and refill the system.