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.