Fan Clutch With Thermostatic Control: Testing
In cases of engine overheating or insufficient air conditioning, proceed as follows:
- Start with a cool engine to ensure complete fan clutch disengagement. Cover radiator grille sufficiently to induce high engine temperature.
- Start engine and operate at 2000 RPM and turn on air conditioning, if equipped. A fan roar will be noticed when fan clutch engages. It will take 5-10 minutes for fan to become engaged. While operating engine under these conditions, observe temperature light to prevent overheating. If hot light comes on, remove cover from radiator grille.
- As soon as clutch engages, remove radiator grille cover and turn air conditioning 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 fails to function as described, it should be replaced.
Rotation speed will vary with engine temperature.