Warning! Avoid touching the impeller blades with your hands, tools and clothing. To avoid personal injury or property damage, do not start the engine with a defective fan. Do not attempt to repair broken impeller blades - change it as an assembly!
Examination
1. Check the fan impeller for cracks, paying special attention to the condition of the blade roots. A defective impeller must be replaced without fail!
2. Check fan clutch assembly for signs of leaks, replace if necessary.
3. Shake the impeller in the longitudinal direction - in case of backlash, replace the clutch assembly.
4. Turn the impeller by hand - a certain resistance should be felt, increasing with increasing engine temperature. If the impeller rotates too freely or does not rotate at all, replace the clutch assembly.
5. Description of the procedures for removing and installing the fan assembly is given in Section Removal and installation of the engine cooling fan.