Or just log-in to select your favorite vehicle!
- Price per unit
- Price per unit
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.
-
2.5 D4D KUN35 4x2 diesel 2005-> from 01/2005 to 04/2012
-
2.5 D4D KUN25 4x4 diesel FAP 2011-> from 08/2011 and more recent
-
2.5 D4D KUN35 4x2 diesel FAP 2011-> from 08/2011 and more recent
-
2,5 D4D KUN15 4x2 diesel 2005->2012 from 07/2005 to 03/2012
-
2.5 D4D KUN25 4x4 diesel 2005->2011 from 07/2005 to 07/2011
-
3.0 D4D KUN26 4x4 diesel DPF 2011-> from 08/2011 and more recent
-
3.0 D4D KUN26 4x4 diesel 2004->2011 from 01/2007 and more recent