Ventilation In Cooling Mode Function Test

WARNING: This page is about a different car, the 2001 Mercedes-Benz SL500 and 2000 Mercedes-Benz SL500. However, it is still accessible from the selected car via links, so may be relevant.

Set temperature to LO. Press AUTO button. If this mode is operating properly, fan speed will increase, air will vent from center and side outlets, A/C compressor will engage, and there will be no heat output. If this mode does not operate properly, perform the following tests:

DTC B1232: REFRIGERANT PRESSURE SENSOR under DIAGNOSTIC TESTS.
COLD PUSH BUTTON CIRCUIT VOLTAGE in MISCELLANEOUS ELECTRICAL TESTS under SYSTEM TESTS.
DTC B1417: AUTOMATIC A/C MONOVALVE under DIAGNOSTIC TESTS.
BLOWER REGULATOR CONTROL in MISCELLANEOUS ELECTRICAL TESTS under SYSTEM TESTS.
DTC B1419: A/C COMPRESSOR CLUTCH under DIAGNOSTIC TESTS.
DTC B1423: SWITCHOVER VALVE BLOCK under DIAGNOSTIC TESTS.
VACUUM DISTRIBUTOR BLOCK, VACUUM RESERVOIR & SWITCHOVER VALVE BLOCK TESTS and VACUUM ACTUATOR CIRCUIT TEST in VACUUM TESTS under SYSTEM TESTS.