Normal Setting In Regulating 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.

Adjust temperature to present in-vehicle temperature. Press AUTO button. If this mode is operating properly, fan speed will decrease, air will vent from defrost outlets and leak from footwell outlets, A/C compressor will engage, temperature of outlet air will be controlled, and automatic A/C monovalve and auxiliary coolant pump will cycle. If this mode does not operate properly, perform the following tests:

DTC B1416: COOLANT CIRCULATION PUMP under DIAGNOSTIC 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.