64 53 ... Notes on replacing drier bottle or drier insert

The drier bottle or drier insert does not have to be replaced at regular service intervals in a functioning, leakproof A/C system.

However, the drier bottle or drier insert must be replaced without fail in the event of: 

• fouling of the refrigerant by filings/shavings (e.g. when the compressor is clamped)
• a leaking A/C system or loss of refrigerant
• the refrigerant circuit being opened for a period exceeding 24 hours, e.g. during repair work.