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Cooling fan


Coparrotthead

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Shouldn't that be a TD5 with a viscous fan?  Aircon fans should only activate with elevated engine temperatures, so it's not normal for them to run on.

Most electric fans will run with the ignition off as they are usually wired straight to the battery.

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The ac fan running continually for a short while after switching off is normal IF the engine bay and cooling system has a high temperature.  Usually happens with my disco on a very hot summers day, ac on plus the two exhaust manifolds makes for a very hot under bonnet situation after a drive. :)

If the ac fan is on all the time while the engines running then the only way to cancel it is to plug the system in to to a diagnostic kit.

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As said the electric fan on after the ignition is off it's normal but for an abnormal situation cos a Td5 with a well working cooling system should not exceed 110*C except in extreme situations, so you have a problem with the cooling system and your engine is running too hot(above 110*C) but as long as the gauge is at the middle it's below 120*C(the marvelous function of the original temp gauge), make sure you have enough coolant then try to stop the viscous fan with a rolled up newspaper when the radiator is hot, if you can you need a new one cos it's just freewheeling and that's why the engine gets too hot, if that's ok you better flush the system well then fill it with 50% OAT mix... we have above 38*C here and mine doesnt exceed 100*C(i have additional gauge) as long as everything is OK... that electric fan has dual purpose, for aircon and for cooling, see attachment

 

Electric fan operation td5.jpg

Edited by sierrafery
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