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2010-2012 Range Rover MkIII / L322
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176 Posts
Discussion Starter #1
Hi guys,

Has anyone had any success with repairing a diesel viscous fan?

My range is over cooling and the fan is very stiff (when the engine isn't running).

Any advice would be appreciated

Many thanks
 

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519 Posts
Surely it's normally fairly stiff when not running ? Problems usually happen when the viscous doesn't lock up and the fan slips. Also is the thermostat working properly ?
 

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2010-2012 Range Rover MkIII / L322
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176 Posts
Discussion Starter #3
The problem is that the water temperature in the engine and the heater core only gets to about 40dc which in my thoughts can only be the fan over cooling (unless someone will correct me)??
 

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1995-2002 Range Rover P38A
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1,295 Posts
That's why engines have thermostats! To restrict coolant circulation to the engine (fundamentally) until desired operational temperature is reached when thermostat opens to allow coolant to pass through the radiator.
Check your 'stat in a pan of heating water with a thermometer and see how it behaves. My guess is you'll find it stuck open.
 

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1995-2002 Range Rover P38A
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397 Posts
I will agree my fan locks when hot and never overheats or underheats, but an open thermos and no heat. Use distilled water only with antifreeze I learned my lesson.
 

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1995-2002 Range Rover P38A
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