a simple clutch that is mechanical but not directly connected to the engine until engaged but is also viscous so it loosely spins when not engaged rev the engine, and it slowly reacts just like electric fans the clutch acts the same way to reach a defined temperature the clutch engages then the fan acts just like a normal mechanical fan could be more realistic if done properly but I don't have the skill to do so right now this mod adds a new radiatorFanType called "viscousfanclutch" which also allows it to use "radiatorFanTemperature" just like the electric fans it also adds "radiatorClutchFanSpin" which is used for props like fans I may continue to mess with this but it's just something I wanted to do as there's no such thing yet till now I have added my custom LUA file so it's technically my first Lua mod as well as a viscous fan clutch addon for Pickup and Roamer Parts radiators as of UPDATE:#4 there are now ways to manually engage the clutch Note, you need both the viscous fan clutch mod along with the addon for it to work currently Spoiler: How to use for Pickup and Roamer Parts how to select the custom clutch for Pickup and Roamer Parts under Radiator then under Rotation: to get full use of the clutch it is recommended to Load Custom EngineThermals under Rotation Spoiler: UPDATE:#1 no longer overrides the combustionEngineThermals.lua which means this can now be uploaded to the official responsory but not just yet added debug app It is a bit more realistic at least it doesn't snap speeds when engaging or disengaging Spoiler: UPDATE:#2 updated custom combustionEngineThermals.lua (vFCcET.lua) from the last game update moved parts from PRP viscous fan clutch addon to viscous fan clutch: models and part of .jbeam so viscous fan clutch is more universal Spoiler: UPDATE:#3 Added license file to stop people from uploading my mods to other sites Redone method for getting file as it now uses the Game Engine GetFileSize instead of dedicated GetFileSize extension Some changes for fan smoothness 6/18/2025 Spoiler: UPDATE:#4 updated custom combustionEngineThermals.lua (vFCcET.lua) from the last game update fixed multiple possible errors for Lua and JavaScript added coolant coloring text as like what's on Engine Thermal Debug added a button to the debug app which now allows for manually engaging the clutch which I'm sure helps for tuning the clutch for vehicles this also means it can be toggled by console! by using Code: controller.getController("viscousFanClutch").manualEngage(boolean) or what I'll recommend is Code: extensions.vFCMgr.engage() a boolean is optional in the function otherwise will be toggled on or off by entering it
