Q7 Quattro V8-4.2L (BAR) (2008)
Hose/Line HVAC: Overhaul
Refrigerant Line Connection Points
NOTE:
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The procedure for loosening applies to all connection points in the refrigerant circuit and for the branching point of refrigerant lines to rear heating
A/C unit. There are differences in diameter for line connections, versions of O-ring seals and mounting bolts.
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Depending on component location, various components in vicinity of connection points must be loosened or removed to be able to disconnect the
connection point.
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The following illustration shows a connection point on plenum chamber front wall in engine compartment.
Disassembling
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Discharge A/C refrigerant system.
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Remove bolts - A -.
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Disconnect connection points of refrigerant lines - D - and - E -.
NOTE: Seal open connections of lines with suitable sealing caps (against penetration of dirt and moisture).
Assembling
Assembly is performed in the reverse order of removal, noting the following:
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Replace O-ring seals - B - and - C -. Version.
NOTE:
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Coat O-ring seals lightly with refrigerant oil before installing.
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Note the different tightening torques of bolts - A -.
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Tightening torque of bolts - A - with a thread "M6" 10 Nm.
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Tightening torque of bolts - A - with a thread "M8" 20 Nm.
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Check positions of refrigerant lines, they must be fully engaged in bracket and cannot come in contact with other components.
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Reinstall any removed components or re-secure loosened components.
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Evacuate refrigerant circuit and recharge again.