Operating An A/C System With An Electrically Driven A/C Compressor
-- Switch the ignition on.
-- Operate the A/C compressor using "basic setting, compressor cut-in" in Guided Fault Finding. Refer to Vehicle Diagnostic Tester, "Guided Fault Finding" function in A/C system and battery regulation.
Additionally on vehicles with electric operated valves in the refrigerant circuit, which cannot be opened without power:
-- Via the Vehicle Diagnostic Tester the electrically activated valves which do not open without power for the operation of the A/C system enable the activation of these valves via the respective control module (to open or close) using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.
On vehicles with high-voltage system and additional functions of the A/C system ("heat pump operation" or "cooling the high-voltage battery") valves may be installed in the refrigerant circuit which cannot be opened without power. These valves are opened and closed for example via a step motor and after switching off the ignition are no longer activated. To completely drain, correctly discharge and charge the refrigerant circuit no areas may be closed, for this reason the valves must be opened before these procedures. After finishing work on the activation of these valves are enabled via the respective control module. Refer to REFRIGERANT CIRCUIT and the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.