Colour Marking of Components For R134A

Background
Components from A/C systems using R134a refrigerant must never, under any circumstances, be mixed with components from A/C systems using R12 refrigerant.

Even very small quantities of the wrong refrigerant or compressor oil give rice to chemical reactions which will eventually ruin the entire A/C system.

To prevent the wrong components from being fitted by mistake, the compressor and the expansion valve are unique to their particular A/C system and are designed so that they cannot be fitted to the wrong system.

The condenser, receiver, evaporator housing and hoses are the same in both systems. To prevent these components from being mixed with each other after they after they have been replaced, a special marking paint for R134a components has been introduced.

The part number of the marking paint is (40) 400 100 095.

Action
Mark replaced R134a components with marking paint as described below. Avoid marking the threads so that the components can be fitted temporarily with no danger of the paint rubbing off.
1. Condenser, mark with paint at the connections
2. Dessicant container, mark at the connections
3. Evaporator housing, mark at the connections
4. Hoses, mark on the attachments

As mentioned earlier the compressor and expansion valve are unique to the R134a system. They cannot be fitted to the wrong system and so need not be marked.