Economy In Heating 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 HI. Press REST button. If operation is correct, air will vent from footwell and left/right side outlets, leak air from defroster outlets and there will be maximum heat output. If this mode does not operate properly, perform the following tests:

A/C PUSH BUTTON CONTROL UNIT VOLTAGE OUTPUT in MISCELLANEOUS ELECTRICAL TESTS under SYSTEM 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.