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Guyzer73



Member Since: 04 Jul 2009
Location: Muscat
Posts: 852

Oman 2006 Range Rover Sport Supercharged Vesuvius Orange
Engine overheating: valve or sensor sticking??

Morning All,

So I have an interesting problem. Basically, this mostly occurs only when restarting the Sport (MY2006 Supercharged) before it has fully cooled down. But it is now also happening on a cold start occasionally.

Basically, the temperature gauge will rapidly rise from cold, through normal to overheating in a matter of minutes. The cooling fan sounds like a turbine in overdrive whenever the engine is 'revved' but everything seems to work fine, no power loss, no error codes etc.

Now by driving over a speed bump, or two, the system will right itself. EG the temperature gauge will drop to normal within 2-3 minutes and the fan revert to normal operations.

This leads me to think that there's a sticking valve or sensor when the engine is hot that is causing this. Would this be right? If so which valve/ sensor could it be?

If not can you point me in the right direction (air bubble) as we're approaching summer here and the temperatures are already over 35°C so need to get this fixed.

Thanks in advance Thumbs Up

Guy 2006 RRS S/C CONSTANTLY under modification...
1994 RRC 4.2l not LSE sadly gone but not forgotten
LR Defender 300Tdi - affectionately know as "The Black Beast"

Post #579382 Mon Apr 22 2019 4:21am
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naks



Member Since: 15 Jul 2016
Location: Stellenbosch
Posts: 1108

South Africa 2013 Range Rover Sport Supercharged Siberian Silver

Best guess would be a sticky thermostat? --
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2015 Range Rover Sport Supercharged V8 HSE Dynamic



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Post #579388 Mon Apr 22 2019 6:53am
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Brit Plumber



Member Since: 05 Jan 2018
Location: Sleaford, Lincolnshire
Posts: 1847

England 2012 Range Rover Sport Supercharged Autobiography Fuji White

/|\ /|\ /|\

Sounds plausible, if/when it happens again, see if the radiator hoses are hot or cold. Also, if you can get to your thermostat housing, try tapping it with something to see if that makes a change. 2012 5.0 SC AB
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Post #579396 Mon Apr 22 2019 7:59am
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Guyzer73



Member Since: 04 Jul 2009
Location: Muscat
Posts: 852

Oman 2006 Range Rover Sport Supercharged Vesuvius Orange

Thanks Guys, I'll look into that tomorrow.

Thumbs Up Thumbs Up

Cheers

Guy 2006 RRS S/C CONSTANTLY under modification...
1994 RRC 4.2l not LSE sadly gone but not forgotten
LR Defender 300Tdi - affectionately know as "The Black Beast"

Post #579426 Mon Apr 22 2019 3:52pm
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