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Fan coolent clutch

what are the signs of a bad coolent fan clutch.

Either the coolant fan doesn’t come on when it should, or the coolant fan never shuts off.


it not electric,it have a belt.

Grab the fan and try wiggling it, There should be no play in the fan. If there is it could be the fan clutch or a worn water pump bearing. With the engine cold, try spinning the fan by hand. It should spin where 3-4 fan blades rotate by before stopping. If the fan is hard to spin the fan clutch is locked up.