Audi Q7: Technical Data
Capacities
Refrigerant R134a and refrigerant oil. Refer to →Fluid Capacity Tables; Rep. Gr.03.
Note
Pay attention to the different capacities for refrigerant R134a in vehicles without a rear heater and A/C unit (with an evaporator) and in vehicles with a rear heater and A/C unit (with two evaporators). Refer to → Refrigerant R134a Servicing; Rep. Gr.87; Refrigerant R134a Capacities, Refrigerant Oil and Approved Refrigerant Oils.
- Discharging, evacuating and recharging refrigerant circuit. Refer to → Refrigerant R134a Servicing; Rep. Gr.87; Refrigerant Circuit.
- Operate the A/C system after charging the refrigerant circuit. Refer to → Chapter "A/C System, Starting after Charging Refrigerant Circuit".
Note
- Depending on the time period of production and the engine, the compressor construction type may vary. Refer to the Parts Catalog.
- Depending on the type of A/C compressor, different refrigerant oil capacities can be provided for the refrigerant circuit. Refer to the Parts Catalog and → Refrigerant R134a Servicing; Rep. Gr.87; Refrigerant R134a Capacities, Refrigerant Oil and Approved Refrigerant Oils.
- Always fill the refrigerant circuit up to the upper tolerance limit (some refrigerant remains in filler hoses).
- Additional notes. Refer to → Refrigerant R134a Servicing; Rep. Gr.87; A/C System, General Information.
Refrigerant Oil
The special refrigerant oil that is only to be used for refrigerant circuits with refrigerant R134a is not commercially available. Refer to the Parts Catalog.
Refrigerant R134a and refrigerant oil. Refer to → Refrigerant R134a Servicing; Rep. Gr.87; Refrigerant R134a Capacities, Refrigerant Oil and Approved Refrigerant Oils.
- Discharging, evacuating and recharging refrigerant circuit. Refer to → Refrigerant R134a Servicing; Rep. Gr.87; Refrigerant Circuit.
- Operate the A/C system after charging the refrigerant circuit. Refer to → Chapter "A/C System, Starting after Charging Refrigerant Circuit".
Caution
Malfunctions due to filling the A/C system with the wrong refrigerant oil.
Only fill the refrigerant circuit with approved refrigerant oils. Refer to the Parts Catalog. The correct refrigerant oil depends on the manufacturer and the type of A/C compressor installed. Refer to → Refrigerant R134a Servicing; Rep. Gr.87; Refrigerant R134a Capacities, Refrigerant Oil and Approved Refrigerant Oils.
Malfunctions due to improper filling of the A/C system with refrigerant oil.
- Too much refrigerant oil in the refrigerant circuit increases the pressures and reduces the cooling output of the system.
- Too little refrigerant oil in the refrigerant circuit can lead to A/C compressor failure due to lubrication problems.
Danger of corrosion in the refrigerant circuit.
Refrigerant oil absorbs moisture. Do not use refrigerant oil from containers that have been left open for a lengthy period of time. Refer to → Refrigerant R134a Servicing; Rep. Gr.87; A/C System, General Information.
Important Information
Refrigerant oil attracts moisture. Close any opened containers immediately after use to prevent moisture from entering.
Oil Distribution
- When the A/C system is being used, the refrigerant oil that was in the A/C compressor before switching on the A/C system for the first time is distributed throughout the entire refrigerant circuit.
- Depending on the previous operating condition of the A/C system before switching it off, the ambient temperatures, etc., the distribution of the refrigerant oil in the refrigerant circuit varies. A general statement about the refrigerant oil distribution in the refrigerant circuit is therefore not possible. Therefore, observe the notes for replacing the refrigerant circuit components. Refer to → Refrigerant R134a Servicing; Rep. Gr.87; Refrigerant Circuit Components, Replacing.
Heating, Ventilation
Component Location Overview - Heater
There is only one A/C system offered for the Audi Q7. Heating without an A/C system is not currently offered.
All information required for servicing the heating and A/C system can be found the A/C system. Refer to → Chapter "Component Location Overview - A/C System".
