300SL (129.061) L6-3.0L (104.981) (1991)
Condenser Fan: Description and Operation
AUXILIARY COOLING FANS AND CONTROL
Auxiliary Fan Relay (K9)
Auxiliary Fan Resistor (R15), High Pressure Switch (S32)
Control Of The Cooling Fans Occurs In Two Stages:
Stage 1
-
With the compressor engaged, outside temperature above 15 ° C and vehicle speed below 40 km/h (25 mph).
-
The auxiliary fans are activated by the control unit via the relay (K9) and the resistor (R15). The fans are switched off at speeds above 70 km/h
(44 mph).
Coolant Temperature Sensor (B10/8)
Stage 2
-
With the compressor engaged and coolant temperature above 107 ° C or a refrigerant pressure greater than 20 bar. Temperature induced
actuation occurs via the coolant temperature sensor (B10/8) and the auxiliary fan relay (K9).
-
Pressure induced actuation occurs via refrigerant high pressure switch (S32) and auxiliary fan relay (K9).