After Charging A/C System

WARNING: This page is about a different car, the 2021 Audi S4 and 2021 Audi A4 Quattro. However, it is still accessible from the selected car via links, so may be relevant.

Mechanically Driven A/C Compressor

After installing the A/C Compressor to the engine (before positioning the belt or installing the driveshaft) Refer to A/C SYSTEM, OPERATING AFTER CHARGING and A/C Compressor .

-- Turn the A/C compressor by hand via the clutch plate or belt pulley on the A/C clutch approximately 10 turns.

After charging. Refer to A/C SYSTEM, OPERATING AFTER CHARGING .

-- Start the engine with the A/C turned off (A/C Clutch -N25- and A/C Compressor Regulator Valve -N280- are not actuated).

-- Following engine idling speed stabilization, switch on A/C compressor and run it for at least 10 minutes at idling speed with maximum cooling output.

Electrically Driven A/C Compressor

-- First start the electrically driven A/C compressor after filling the refrigerant circuit via the "Compressor Cut-In" function from the basic setting. Refer to A/C SYSTEM, OPERATING AFTER CHARGING and Vehicle Diagnostic Tester in the"Guided Fault Finding" Function for the A/C System and the Battery Regulation.