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Hose/Line HVAC|Service and Repair > < A/C Pressure Relief Valve <--> [High Pressure Safety Valve HVAC]|Description and Operation

A4 Sedan L4-1.8L Turbo (AEB) (1997)

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Hose/Line HVAC: Description and Operation

Refrigerant System (R-134a), Components

Hoses and Lines

The mixture of refrigerant oil (PAG oil) and refrigerant R-134a attacks some metals and alloys (for example, copper) and breaks down certain hose
material. Use only hoses and lines which are identified with the lettering "R-134a".

Hoses and lines are secured with threaded connections. Always properly torque hose and line connections.

Hose/Line HVAC|Service and Repair > < A/C Pressure Relief Valve <--> [High Pressure Safety Valve HVAC]|Description and Operation