Q7 Quattro V8-4.2L (BAR) (2008)
Hose/Line HVAC: Removal and Replacement
Refrigerant Lines from Rear Expansion Valve
Refrigerant Lines from Rear Expansion Valve
Removing
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Discharge A/C refrigerant system
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Depending on vehicle equipment, remove fitted foam section under left luggage compartment lining or pressure reservoir of air spring suspension
system.
‹› Pressure reservoir of air spring suspension system is not removed, pressurized air system is not opened, therefore make sure that pressurized air
line is not kinked, yanked or otherwise damaged.
‹› So that the pressure reservoir can be detached and set aside, the emergency wheel or the Bass Loudspeaker (R100) must be removed, depending
on vehicle equipment.
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Through the opening under left luggage compartment lining, remove bolts - A - (tightening torque 10 Nm).
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Disconnect refrigerant lines - B - and - C -.
‹› Close all open lines and connections on expansion valve with suitable caps (avoid dirt and moisture from entering the system).
Installing
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Replace O-rings - D - and - E -. Version.
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Check fitted pin - G - (installed in low pressure line connection or in expansion valve - F -, not installed at all connections) and sleeves - H - of
refrigerant lines for damage and proper seating.
‹› Coat O-ring seals lightly with refrigerant oil before installing => [ O-Ring Seals for Refrigerant Circuit ] See: Heating and Air
Conditioning/Service and Repair/Removal and Replacement/O-Ring Seals for Refrigerant Circuit.
‹› Check O-ring seals for proper seating in groove - J - of respective refrigerant line.
‹› Install refrigerant lines free of stress.
‹› Check installation position of refrigerant lines to expansion valve (they should not come in contact with other components).
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Insert refrigerant lines into expansion valve.
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Install bolts - A - (tightening torque 10 Nm).
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Install all removed components again.
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Evacuate refrigerant circuit and recharge again.