Hi Guys, a little help needed if possible, I have just bought a supercharged rrs, the cooling fan has switch has been bypassed so runs constant, please can anyone tell me what the switch is that I need to purchase to repair this.
many thanks
Brian

I suspect you are mistaken.

Can you elaborate please Andy?

Cars don't tend to have a switch these days. They use the ecu temperature sensor and the ecu controls it.

Either.
1. The air con is on
2. Is it a viscous fan ?

Thanks Andy, to be honest I'm not clued up on this sort of thing'should the fan be running all the time, how can I tell if it has a viscous fan?

Brian

There is also a fan (IIRC for the gearbox oil cooler) that can run briefly after start up and is quite audible on cold days. 2020 Pangea Green 1st Edition D240 New Defender 110 is here and loving it
2018 Melting Silver Mini Countryman PHEV - soon to be replaced
2015MY Corris Grey SDv6 HSE Dynamic, the best car I have ever owned, totally reliable only a cou0le of rattles in 3 years, now no longer in my care
Also in my garage is a 1996 TDi300 Defender 90 County HT made into a fake CSW

Think you're thinking of the FBH, Tim. The gearbox cooler is integral to the radiator.  Visiting from DISCO3.CO.UK
2006 Discovery 3 TDV6 Auto HSE Zambezi Silver

FBH fan is almost silent in my experience, this was a loud, almost like the engine is stressed, rushing noise that I used to get from under both the TDv6 and TDv8 RRS's that I owned, my current SDv6 has not (not that I have noticed) made it. It literally lasted 2-3 minutes after pull away. When I queried it at the dealership I was told not to worry it was either something to do with the gearbox oil cooling or the VCU sensing the outside temperature ............ 2020 Pangea Green 1st Edition D240 New Defender 110 is here and loving it
2018 Melting Silver Mini Countryman PHEV - soon to be replaced
2015MY Corris Grey SDv6 HSE Dynamic, the best car I have ever owned, totally reliable only a cou0le of rattles in 3 years, now no longer in my care
Also in my garage is a 1996 TDi300 Defender 90 County HT made into a fake CSW

Brisy007 wrote:

Thanks Andy, to be honest I'm not clued up on this sort of thing'should the fan be running all the time, how can I tell if it has a viscous fan?

Brian

I thought that a viscous fan worked using the same principal as the viscous coupling in the transmission- i.e. As the viscosity of the fluid in the coupling heats up it either thickens or thins and the amount of slippage due to the change of viscosity determines if the fan or clutch operates and the amount that it engages. I comment on this as I recently had the viscous coupled fan on my Defender replaced at 20 years old as it wasn't cutting when the engine got a bit hot on the motorway........ and that was how the Indie who replaced it for me explained roughly how it works. The fan is run by either a belt drive or electrically and the viscous coupling is there to save power losses from the fan ruining unnecessarily
http://www.freeasestudyguides.com/performa...lutch.html 2020 Pangea Green 1st Edition D240 New Defender 110 is here and loving it
2018 Melting Silver Mini Countryman PHEV - soon to be replaced
2015MY Corris Grey SDv6 HSE Dynamic, the best car I have ever owned, totally reliable only a cou0le of rattles in 3 years, now no longer in my care
Also in my garage is a 1996 TDi300 Defender 90 County HT made into a fake CSW

My understanding is that the fan (certainly on my TDV6) is 'electro viscous'. In that, whilst it is a viscous fan it also has an electronic component to the coupling that is controlled by an ECU. Sometimes when the engine is cold it takes a while for the ECU to gather its required info and so resorts to its default setting i.e. fan locked up for maximum cooling. I experienced this on my RRS so researched the topic as I knew the fan was viscous and therefore, to my previous understanding, must be faulty. Fortunately that was not the case!!

OP, if you have a viscous fan it will be physically connected to the engine, if it is an electric fan then there will be no connection to the engine. I suspect that you may have a viscous fan (my experience of LR is that is their preference) unless someone has fitted an aftermarket electric fan - not unheard of on older vehicles.