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Home >> Volvo >> 2002 >> S40 >> Repair and Diagnosis >> Engine Performance >> Theory and Operation >> Engine Controls - Theory & Operation >> Computerized Engine Controls >> Output Signals >> Engine Cooling Fan
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Engine Cooling Fan

Electric fan relays are controlled by the ECM based on input from the Engine Coolant Temperature (ECT) sensor. For circuit details, see AIR CONDITIONING wiring diagrams in SYSTEM WIRING DIAGRAMS.