Hose/Line HVAC: Description and Operation

A/C System 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 that are identified with a green mark (stripe) or the lettering "R-134a".

Hoses and lines are fastened together with threaded couplings/fittings and are retained (to bodywork or components) with specially isolated hose clamps.


NOTE:
- During servicing, all couplings, fittings and related fasteners must be torqued to specifications. Refer to "A/C Refrigerant System, Replacing Components" Service and Repair
- Ensure that only special tools (as specified) are used while servicing.