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Bushy30



Member Since: 03 Jun 2018
Location: Oxfordshire
Posts: 41

United Kingdom 2004 Range Rover Vogue 4.4 V8 Giverny Green
Thermostat and general coolant system conundrum

As mentioned elsewhere here had an overheat and thermostat fault last Friday evening.

Got a new thermostat before reading about the mod ( Censored !)

Question is should I get an electric fan too as that's thrown a fault also -- or is the fat that the thermostat is knackered and reason why the fan didn't come on either -- interestingly I think my viscous might not work either -- surely all three wouldn't fail at the same time..................


Last edited by Bushy30 on 17th Jul 2018 9:13pm. Edited 1 time in total

Post #483304 12th Jul 2018 6:21pm
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UK Marine



Member Since: 22 Jul 2016
Location: Durham, County Durham UK
Posts: 642

England 2003 Range Rover Vogue 4.4 V8 Zambezi Silver

Hi Bushy,

The only electric fans are the aircon ones they only help in cooling the engine when the going gets really tough, so not very often.

What makes you think the viscous fan is goosed.. ______________________________
Simon
______________________________

Range Rover Classic 3.5 efi - Gone
Range Rover Classic 3.9 efi - Gone
Range Rover Classic 4.2 LSE - Sadly gone
Land Rover 110 3.5 - Gone
Range Rover P38a 4.0 SE - Pleased it's gone
Range Rover P38a 2.5 DHSE - Just sold
Range Rover L322 4.4 v8 Petrol - Current

Post #483316 12th Jul 2018 7:21pm
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Bushy30



Member Since: 03 Jun 2018
Location: Oxfordshire
Posts: 41

United Kingdom 2004 Range Rover Vogue 4.4 V8 Giverny Green

Because when I pulled over with water gushing out of the lid of the expansion bottle I could spin the viscous fan blades -- I would have hoped that it would have been hot enough to have engaged -- though thinking about that a bit more -- where does the viscous get heat from to engage? if it's the rad that would have been cold as the thermostat didn't open................

Hmmmmm it's all a bit which one comes first -- chicken or egg, thermostat or fan Very Happy

Post #483317 12th Jul 2018 7:36pm
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Bushy30



Member Since: 03 Jun 2018
Location: Oxfordshire
Posts: 41

United Kingdom 2004 Range Rover Vogue 4.4 V8 Giverny Green

........... and here's another thought, why not just cut the stat out completely and leave it out


Standing by to be shouted at for being silly!

I do electrics really, not mechanics Wink

Post #483319 12th Jul 2018 7:43pm
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UK Marine



Member Since: 22 Jul 2016
Location: Durham, County Durham UK
Posts: 642

England 2003 Range Rover Vogue 4.4 V8 Zambezi Silver

The thermostat may well have opened but as is usually the case with our model of Range Rover the radiator gets blocked at the bottom.

I bought my Range Rover with a suspected head gasket failure as the owner reported coolant gushing out of the expansion tank Whistle upon inspection I found this




So I bought a new radiator and all was ok but then I read about the thermostat mod and did that too and it’s been fine since.

As far as leaving the thermostat out altogether it would take forever to heat up and supply warmth to the car.. ______________________________
Simon
______________________________

Range Rover Classic 3.5 efi - Gone
Range Rover Classic 3.9 efi - Gone
Range Rover Classic 4.2 LSE - Sadly gone
Land Rover 110 3.5 - Gone
Range Rover P38a 4.0 SE - Pleased it's gone
Range Rover P38a 2.5 DHSE - Just sold
Range Rover L322 4.4 v8 Petrol - Current

Post #483322 12th Jul 2018 8:22pm
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Bushy30



Member Since: 03 Jun 2018
Location: Oxfordshire
Posts: 41

United Kingdom 2004 Range Rover Vogue 4.4 V8 Giverny Green

Oh blimey, why did someone put a load of snot in your radiator ???

Post #483324 12th Jul 2018 8:56pm
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UK Marine



Member Since: 22 Jul 2016
Location: Durham, County Durham UK
Posts: 642

England 2003 Range Rover Vogue 4.4 V8 Zambezi Silver

Ha imagine what I thought when I saw it gooping out like that Rolling with laughter

Seriously though if you’re working in that area I would be looking at the radiator first... ______________________________
Simon
______________________________

Range Rover Classic 3.5 efi - Gone
Range Rover Classic 3.9 efi - Gone
Range Rover Classic 4.2 LSE - Sadly gone
Land Rover 110 3.5 - Gone
Range Rover P38a 4.0 SE - Pleased it's gone
Range Rover P38a 2.5 DHSE - Just sold
Range Rover L322 4.4 v8 Petrol - Current

Post #483325 12th Jul 2018 9:03pm
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Bushy30



Member Since: 03 Jun 2018
Location: Oxfordshire
Posts: 41

United Kingdom 2004 Range Rover Vogue 4.4 V8 Giverny Green

Had the car about 6 weeks, it has already done a couple of 120 mile trips without issue, I would have thought the rad would have shown before Friday, but you could be right, I'll look at it.

Now then, to the fans

I thought I'd read the electric fan cuts in first, followed by the viscous -- in fact I'm sure Joe90 said he'd removed his viscous in favour of just using the electric one.............. or have I got that all cart before horse?

Post #483326 12th Jul 2018 9:06pm
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Joe90



Member Since: 29 Apr 2010
Location: Winchester
Posts: 5013

England 2002 Range Rover HSE Td6 Alveston Red

You can remove the vicious fan on a TD6 as the engine runs so cool, and is OK in our (what was) temperate climate, but do not do this on the petrol engine. Also a thermostat is a very sensible thing, and easy to replace on the petrol engine, unlike on the diesel Evil or Very Mad 


Have "IID non BT 02-05" & "RSW All Comms" in Hampshire - happy to help Smile
Also have VAG VCDS if you have an Audi/VW etc.
Always have comprehensive toolkit: hammer, duct tape, WD40 Wink
robertus-maximus - sollus-arbilla vagor stlata

Post #483328 12th Jul 2018 9:28pm
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Bushy30



Member Since: 03 Jun 2018
Location: Oxfordshire
Posts: 41

United Kingdom 2004 Range Rover Vogue 4.4 V8 Giverny Green

Thanks Joe, so, as mines petrol, make sure the viscous fan is working? which operates first, electric or viscous?

Post #483331 12th Jul 2018 9:46pm
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Joe90



Member Since: 29 Apr 2010
Location: Winchester
Posts: 5013

England 2002 Range Rover HSE Td6 Alveston Red

The electric fan is for the air con condenser. in warmer weather this will kick in to cool the refrigerant if you have the AC on (you always have the AC on ,don't you?), the side effect being of air being blown across the coolant radiator as well, when in traffic etc.

My vicious fan always went round, so probably never worked as intended...

BTW that isn't a spelling mistake Wink 


Have "IID non BT 02-05" & "RSW All Comms" in Hampshire - happy to help Smile
Also have VAG VCDS if you have an Audi/VW etc.
Always have comprehensive toolkit: hammer, duct tape, WD40 Wink
robertus-maximus - sollus-arbilla vagor stlata

Post #483333 12th Jul 2018 10:04pm
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Strider



Member Since: 08 Jun 2015
Location: Middle Earth
Posts: 216

United Kingdom 2007 Range Rover Supercharged 4.2 SC V8 Zermatt Silver

When I had my Classic RR, I found the viscous fan was always engaged even on a frosty day, so I removed it and bought a twin electric fan kit from a firm called Kenlowe.
The temp sensor plus pipe entered through the top hose rad spigot. There was a dial in the cabin that went to the fans relay so if you had a temp spike you could manually override the stat. When they cut in it sounded like a jet about to take off Laughing .
I guess the hidden plus was that it freed up some horsepower (no fan to drive) so they claimed.

Post #483334 12th Jul 2018 10:34pm
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Bushy30



Member Since: 03 Jun 2018
Location: Oxfordshire
Posts: 41

United Kingdom 2004 Range Rover Vogue 4.4 V8 Giverny Green

Thanks both

Post #483337 13th Jul 2018 12:00am
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UK Marine



Member Since: 22 Jul 2016
Location: Durham, County Durham UK
Posts: 642

England 2003 Range Rover Vogue 4.4 V8 Zambezi Silver

Hi Bushy,

If the viscous clutch is on the way out you can always replace it - I found this online but there could be cheaper ones around.

https://rover.ebay.com/rover/0/0/0?mpre=ht...2615900482

Cheers ______________________________
Simon
______________________________

Range Rover Classic 3.5 efi - Gone
Range Rover Classic 3.9 efi - Gone
Range Rover Classic 4.2 LSE - Sadly gone
Land Rover 110 3.5 - Gone
Range Rover P38a 4.0 SE - Pleased it's gone
Range Rover P38a 2.5 DHSE - Just sold
Range Rover L322 4.4 v8 Petrol - Current

Post #483351 13th Jul 2018 9:51am
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Bushy30



Member Since: 03 Jun 2018
Location: Oxfordshire
Posts: 41

United Kingdom 2004 Range Rover Vogue 4.4 V8 Giverny Green

Thanks good Sir Smile

Post #483352 13th Jul 2018 10:13am
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