TT L4-1.8L Turbo (BEA) (2004)
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Hose/Line HVAC: Service and Repair
O-Rings, Hoses and lines
O-Rings
O-rings seal the connections between components of the A/C system.
Use only O-rings which are compatible with R-134a refrigerant and refrigerant (PAG) oil. Refer to the most recent parts information when obtaining new
O-rings.
O-rings are recognized by colors (currently red, green or violet). Under certain conditions, black O rings may also be installed in production.
NOTE:
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Use O-rings only once and always replace.
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Handle the O-rings only in a clean working environment.
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Always use correct size O-rings (dimensions -a- and -b-).
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Lubricate the O-rings with refrigerant (PAG) oil before installing.
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Always make sure to properly install the O-rings on line/component mounting flanges/grooves.
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O-ring and torque specifications also apply to the threaded connections in the A/C lines.
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.
