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how do you check the fan clutch not working on 2003 ram 3500 5.9
Radiator fan speed not correct. Your fan clutch has failed.
How to remove fan clutch on 2003 ford explorer
Yes, it is an electrically controled mechanical fan.
Check fan belt tension.
Counterclockwise
Turn the large nut loose (1 7/16") by turning it counterclockwise then spin the fan and fan clutch off as an assembly. Separate the fan from the clutch on the bench.
by use of fan cluthc wrench ( air hammer)
230 deg. F.
It requires a 36mm wrench and a spanner/holding device. The fan clutch unscrews counter clockwise.
Check clutch fan
When the engine is cold, open the hood before starting up. Try and spin the fan by hand. The fan should spin with considerable resistance. If the fan free wheels with no resistance then the fan clutch is bad. If the fan does not spin at all, the clutch is seized.