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The viscous coupling is a thermostatic device that's an integral part of your 4x4's cooling system. When the engine is cold or at normal operating temperature, the viscous coupling is partially disengaged. This saves power as the engine doesn’t have to drive the fan fully. However, if the engine temperature rises above the viscous coupling’s engagement setting, the fan fully engages. This draws more air through the vehicle's radiator, which helps maintain or lower the engine coolant temperature to an acceptable level.
Why Change the Viscous Coupling?
If you notice engine overheating at idle or in slow traffic, it might be a sign that the viscous coupling is failing to engage, preventing air from being drawn through the radiator.
Engine Running and Hot: Try stopping the viscous coupling with a piece of cardboard. If it’s constantly ventilating, causing engine power loss or increased fuel consumption, the viscous coupling might be stuck in a position that doesn't correspond to the temperature, meaning it’s not disengaging properly when the engine is cold.
Engine Off and Cold: Try spinning the fan. If you notice lukewarm heating or failing air conditioning, it could mean the viscous coupling isn’t regulating the radiator or air conditioning temperature properly according to the outside climate. Also, listen for any grinding noises while the engine is running, which could indicate worn bearings in the viscous coupling, causing play and noise in the engine's operation.
Regular checks and timely replacement of the viscous coupling can prevent these issues, ensuring your vehicle's cooling system operates efficiently.
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FJ45 4.2 petrol 1969->1985 from 01/1976 to 05/1985
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FJ55 4.2 petrol 1975->1980 from 10/1975 to 07/1980
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FJ43 4.2 petrol 1969->1985 from 03/1969 to 07/1985
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FJ40 4.2 petrol 1969->1985 from 03/1969 to 09/1985
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FJ60 4.2 petrol 1980->1984 from 08/1980 to 11/1984
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FJ62 4.0 petrol 1984->1990 from 11/1984 to 01/1990
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FJ75 4.0 petrol 1984->1992 from 11/1984 to 08/1992
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FJ70 4.0 petrol 1984->1992 from 11/1984 to 08/1992
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FJ73 4.0 petrol 1984->1992 from 11/1984 to 08/1992