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Home >> Chevrolet >> 1990 >> Chevy Van G20, 5.0 H, 400/M40 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Miscellaneous ECM Controls >> Cooling Fan Motor
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Cooling Fan Motor

Disconnect cooling fan motor harness connector. Apply battery voltage to one of the fan motor terminals and jumper the other terminal to ground. Fan motor should activate. If fan motor does not activate, replace faulty fan motor.

Fig 1: 3.1L Cooling Fan Schematic
G90G15749Courtesy of GENERAL MOTORS CORP.
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