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Home >> Oldsmobile >> 1990 >> Custom Cruiser >> Repair and Diagnosis >> Engine Mechanical >> Engine Cooling Fan >> Testing >> Thermostatically Controlled Fan Assembly

Thermostatically Controlled Fan Assembly

  1. In cases of engine overheating or insufficient air conditioning, start with a cool engine to ensure complete fan clutch disengagement. Cover radiator grille to induce high engine temperature.
  2. Start engine and operate at 2000 RPM. Turn on air conditioning (if equipped). When radiator discharge air temperature gets hot, a fan roar will be noticed when fan clutch engages.
    NOTE: It takes approximately 5-10 minutes for temperature to become hot enough to allow engagement of fan clutch. While operating engine under this condition, observe temperature light or gauge to prevent overheating. If car overheats, remove cover from radiator grille.
  3. When clutch engages, remove radiator grille cover and turn A/C off to assist in engine cooling. After several minutes fan clutch should disengage. This can be determined by a reduction in fan speed and roar. If fan clutch fails to function as described, it should be replaced.
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