Sidekick JS 2D Soft Top 2WD L4-1.6L (1997)
Fan Clutch: Description and Operation
COOLING FAN CLUTCH
Fluid is enclosed in the cooling fan clutch and at its center front, there is a bimetal whose thermal reaction and the engine speed control the cooling fan
speed. The clutch is installed to the water pump shaft, so that the cooling fan operates at approximately the same speed as the water pump shaft
regardless of the air temperature at the front of the clutch when the water pump shaft turns at low speed (when the engine running at idle speed). When
the air temperature at the front of the clutch exceeds 55 C° (131 F°) and the engine speed increases gradually, the clutch slippage increases. Thus even
when revolution speed of the water pump shaft increases that of the cooling fan does not as much. When the engine speed increases further at over 55
C° (131 F°) air temperature and revolution speed of the water pump shaft exceeds 4,000 r/minute (rpm), that of the cooling fan becomes almost
constant (2,800 to 3,100 r/minute) independently of the water pump shaft.
NOTE: Do not disassemble clutch assembly.
