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| Ianh Member Since: 17 Sep 2018 Location: Essex Posts: 1997  
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As standard the fan will be a viscous fan , although someone could have replaced it with an electric fan. It’s easy to tell which one you have with the bonnet open, if not sure post a picture and members will confirm.
A viscous fan is a self contained unit, with no input from external sensors. In essence it uses a bimetallic coil, that when heated allows fluid to fill a gap between two plates that then causes the fan to rotate. The fan can free rotate with engine running but if working properly does not engage more unless the airflow over the bimetallic coil reaches the right temperature. From what you say , if it’s a viscous fan, it is working as normal. This is well worth a read on the subject. https://www.defender2.net/forum/post754068.html |
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29th Apr 2024 11:58am |
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| hank Member Since: 12 Sep 2016 Location: South Wales Posts: 2296  
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Double check which fan is going.
The engine coolant fan is viscous. The air conditioning condenser fan is electric - you can see this one behind the front grille > 110 XS Double Cab |
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29th Apr 2024 12:00pm |
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| Mo Murphy Member Since: 01 Jun 2008 Location: Letchworth Garden City, Herts Posts: 2227 
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The viscous fan will always rotate with the engine but its basically just freewheeling until the hub locks up.
Mo The Land Rover 90 - Many are called, few are chosen. 50 Shades of Pennine Grey |
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29th Apr 2024 2:22pm |
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| Phillywilly72 Member Since: 29 Apr 2024 Location: Wiltshire Posts: 63 
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I don’t have air con and if the rad fan goes at full whack on startup, I suspect it’s seized. I’ll try the newspaper method first. Also will a viscous freely rotate if I hand spin it switched off and cold?
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29th Apr 2024 3:35pm |
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| andy63 Member Since: 30 Jun 2023 Location: north east Posts: 513
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The fan may well make a bit of a roar at start up.. But it should revert to a quieter tone fairly quickly.. If there is fluid still in the coupling when you start it takes a few seconds for it to be forced back into the reservoir..
I'm sure this has already been mentioned but if you use a bit folded newspaper it should be possible to stop it rotating fairly easily when cool.. When warmed up and connected it will be difficult to stop if it's working properly.. I'm sure you could use a hot air gun to carefully connect the coupling by actuating the valve 👍 |
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29th Apr 2024 3:53pm |
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| MadTom Member Since: 10 Sep 2013 Location: Olomouc Posts: 616  
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Just small detail - when the mechanical engine fan is on full power (with viscous clutch engaged), it sounds like a small helicopter, and with hot engine you will feel hot wind on your feet standing behind the car. Is is much more powerfull than standard electric fan. "Drobek" = The Small One - Discovery 2, "Blufínek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo
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30th Apr 2024 7:31am |
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