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Fan - viscous coupling
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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VZN130 3.0 V6 petrol 1989->1995 from 11/1989 and more recent
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LN130 (11LND9) 2.4TD diesel 1990->1995 from 01/1990 to 11/1995
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LN106 33/31LNA6 2.8D leaf Dble/Sgle cab 1988->97 from 08/1988 to 12/1997
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LN166 2.8D diesel ifs Sgle/Dble cab 4x4 1997->2006 from 08/2001 to 06/2005
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LN170 (32LNH3) 2.4TD ifs Xtra cab 4x4 1997->2001 from 11/1997 to 08/2001
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LN150 2.4D diesel ifs Xtra cab 4x2 1997->2001 from 11/1997 to 08/2001
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LN165 (33LNG8) 2.4TD ifs Sgle/Dblecab 4x4 97->2001 from 08/1997 to 08/2001
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LN145 (3#LNE5) 2.4D ifs Dble/Sple cab 4x2 97->2001 from 08/1997 to 08/2001
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LN171 2.8D diesel ifs Xtra cab 4x4 1997->2005 from 08/2001 to 05/2005
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LJ150 3.0D diesel (except europe) (LWB) 2009-> from 08/2009 and more recent
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LJ77 2.4TD diesel 1990->1993 from 01/1990 to 05/1993
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BJ73 3.4D diesel 1984->1990 from 01/1990 to 01/1990
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BJ74 3.4TD diesel (except europe) 1985->1990 from 01/1990 to 01/1990
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LJ70 2.4TD diesel Rectangular headlamp 1990->1995 from 01/1990 to 01/1995
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LJ73 2.4TD diesel Rectangular headlamp 1990->1995 from 01/1990 to 01/1995
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LY100 2.4D diesel 1995->2001 from 05/1995 to 07/2001
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LH80 2.4D diesel 1985->1995 from 08/1988 to 04/1995
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LY212 3.0D diesel 1998->2001 from 05/1998 to 07/2001
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LXH18 2.4 TD from 10/1996 and more recent