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Mike c



Member Since: 11 Aug 2017
Location: Maldon, Essex
Posts: 941
England 2004 Defender 90 Td5 CSW Belize Green
Random viscous fan question
A random question! The fan roars for first few seconds when setting off from cold, not always, but sometimes, why is this? I thought they were only supposed to kick in when the engine needs cooling .

It used to do the same on my old Discovery td5, just curious to know how they work Question

Thanks

Mike
Post #836391 10th Jun 2020 6:51pm
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Retroanaconda



Member Since: 04 Jan 2012
Location: Scotland
Posts: 2737
Scotland 
The viscous fluid settles when it sits still, so it effectively engages the fan on startup until it starts to flow freely. It then only locks up again when the coupling gets warm and the fluid re-engages the unit.
Post #836399 10th Jun 2020 7:27pm
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Mike c



Member Since: 11 Aug 2017
Location: Maldon, Essex
Posts: 941
England 2004 Defender 90 Td5 CSW Belize Green
Thanks, that now makes sense Thumbs Up
Post #836404 10th Jun 2020 7:49pm
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lightning



Member Since: 23 Apr 2009
Location: High Peak, Derbyshire
Posts: 3143
United Kingdom 
Well that’s answered a question for me as well, because mine does this as well when l first start up in the morning.
Post #836450 10th Jun 2020 10:54pm
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Hufflepuff



Member Since: 25 Oct 2014
Location: Hampshire
Posts: 727
England 2005 Defender 90 Td5 XS CSW Tonga Green
Aaaahhhh! Is that the reason? I thought mine was on the blink too, as it always sounds like its running for the first minute up the road. Thanks Retroanaconda! Bow down 2005 Td5 90 XS
1989 V8 110 CSW
Post #836496 11th Jun 2020 10:14am
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Mike c



Member Since: 11 Aug 2017
Location: Maldon, Essex
Posts: 941
England 2004 Defender 90 Td5 CSW Belize Green
Glad to know I wasn't the only one confused by it! Laughing
Post #836536 11th Jun 2020 12:26pm
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