Vehicle & Technical > Discovery

Gettin a bit hot... viscous fan?

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Ja1983:
just picked SWMBO up from work, and notced the temperature guage going up to the 3/4 mark, its been sitting a bit further over its normal position at half way for a few weeks now, the water level remains good (for last month, had a waterpump done prior to that) and the temp drops marginally when the blower is on full. as soon as i pulled up, i switched the engine off, and popped the bonnet. checked for the obvious head gasket signs, but none there.. then tried moving the fan, it moved very freely (no resistance at all) my understanding is that the coupling locks up with heat so the fan turns with the shaft, thus cooling the engine.....


is this the prime suspect? just changed the oil (for hi synthetic 10w40) but cant see that making a difference, fuel filter wasnt done long ago, air filter looks fairly clear, although will be replaced tomorrow..

ideas?

ben_haynes:
get rid of it and fit electric fans on a thermostatic or manual switch

Ja1983:
would do if:

a) i knew this was the problem
b) money wasnt an issue (wedding to pay for!)
c)i had the time to do it

also forgot to add, no signs of any airlocks since changed the waterpump...

ben_haynes:
bleed the system just incase

have you checked the rad is not clogged with muck at all

Ja1983:
i`m certain theres no airlock, the level is bang on, and has been for months, even after been stood over xmas.

rads clean, and in surprisingly good condition for a D1! - must have been replaced recently

all i really need to know is the normal functioning of the viscous fan, ie. when warm, should it lock up to the spindle?

cheers my fellow insomniac! :lol:

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