S4 Sedan L5-2226cc 2.22L DOHC Turbo (AAN) (1992)
Service Port HVAC: Locations
1. A/C compressor (Zexel)
Low pressure connection
High pressure connection
Note: The variable displacement A/C compressor varies piston stroke and output depending on load requirements and suction pressure.
CAUTION: Discharge A/C refrigerant system before removing A/C compressor speed sensor.
2. A/C compressor speed sensor
3. A/C compressor clutch
CAUTION: Remove the drain plug only after the compressor has been removed. It is used only to drain oil from old compressor and to check oil
level in a new compressor
4. Oil drain plug
WARNING: Discharge A/C refrigerant system before removing pressure relief valve.
5. Pressure relief valve
6. Service valve (high pressure)
For A/C refrigerant high pressure switch
Remove switch and connect A/C high pressure gauge when checking pressures, discharging, evacuating or charging system
Note: For checking system pressure, remove A/C refrigerant high pressure switch and reconnect to connector.
7. A/C refrigerant high pressure switch
8. Condenser
9. Service valve (high pressure)
For A/C high pressure switch
Remove switch and connect A/C high pressure gauge when checking pressures, discharging, evacuating or charging system
10. A/C refrigerant high pressure switch
11. Refrigerant line connection
12. Restrictor