Jim Mason Posted June 16, 2020 Share Posted June 16, 2020 Hi there, Just replaced the viscous fan on my 300tdi discovery 1 with part number ERR2266. I was no longer getting characteristic roar on startup with old fan unit. Fitted new viscous fan, but outside temperature is 21°C engine was cold but still not getting characteristic roar on startup. Is the outside temp causing it to immediatly couple, was expecting 30 second roar then disconnection. Quote Link to comment Share on other sites More sharing options...
Snagger Posted June 17, 2020 Share Posted June 17, 2020 I can’t say I ever got that roar from my 300 unless the engine was hot. The fan should be idling on startup in any UK weather, able to slip if you stick a rolled up news paper into the blades. No resistance would indicate a failed hub, but it should be easy to stop the fan (or prevent it on start up). Quote Link to comment Share on other sites More sharing options...
BogMonster Posted June 18, 2020 Share Posted June 18, 2020 Some do it some don't, I don't think it is necessarily a fault. You want it to roar when it's hot, and as long as it does that it is fine. Quote Link to comment Share on other sites More sharing options...
sierrafery Posted June 18, 2020 Share Posted June 18, 2020 (edited) The viscous fan is freewheeling untill the radiant heat of radiator heats up it's bimetalic coil to 72*C then it starts to lock progressively so it's definitely not supposed to be noisy on cold start regardless of outside temp Edited June 18, 2020 by sierrafery Quote Link to comment Share on other sites More sharing options...
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