BMW 3 Series Service Manual
Contents
1. RADIATOR AND COOLING SYSTEM NOTE Some cars covered by this manual may have an alter nate cooling fan switch with switching temperatures of 176 190 F 80 88 C When replacing the switch check the switching specifications which should be Stamped on the switch body 1 If coolant is circulating at normal operating tempera ture but auxiliary cooling fan does not run disconnect connector from radiator temperature switch and make tests listed in Table c Table c Auxiliary Cooling Fan Temperature Switch Tests Test Test results Black green terminal 2 and Ignition ON Fan runs on brown terminal 1 low speed Black gray terminal 3 and Ignition ON Fan runs on brown terminal 1 high speed 2 If fan runs only when powered directly by jumpered connector and hot coolant is circulating through radia tor radiator temperature switch is most likely faulty Use a new sealing ring when replacing switch Wires jumpered Tightening Torque e Temperature switch to radiator 15 Nm 11 ft lb 3 If auxiliary fan does not run when powered directly check for battery voltage at temperature switch connec tor black green wire with ignition on If battery voltage is not present check fuses See 610 Electrical Com ponent Locations Auxiliary Cooling Fan Circuit Fuses Fuse 16 Ad hth Getta EEE EE esacns 5 amp e Fuse 41 ex M44 w man trans 30 amp Fuse 48 M442. w man trans only 40 amp 4 If no faults are found remove low speed relay and turn ignition ON See Fig 4 e Check for power at terminal 30 and terminal 86 of relay socket e Reinstall low speed relay and repeat test at high speed relay socket Fix any wiring faults found On early production cars up to 9 92 If fan operates only on high speed and no electrical faults have been found up to this point use an ohmmeter to check that fan resistor is not electri cally open Resistor is mounted on auxiliary cooling fan housing behind front grille See Fig 5 Wiring diagrams for the radiator cooling fan can be found under Electrical Wiring Diagrams 170 5 Fig 4 Auxiliary radiator cooling fan low speed relay 1 and high speed relay 2 in power distribution box Relay locations may Vary Fig 5 Auxiliary radiator fan resistor arrow COOLING SYSTEM SERVICE Coolant draining and filling 1 Remove expansion tank cap Set temperature controls to full warm WARNING Allow the cooling system to cool before opening or draining the cooling system 2 Place 3 gallon pail beneath radiator drain plug and re move drain plug See Fig 6 3 Place 3 gallon pail beneath rear of engine block Loos en and remove engine block coolant drain plug COOLING SYSTEM SERVICE
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