Just putting it out there..
Many years ago in my Porsche days I met a chap who had a 928 and he had removed the viscous fan from the engine saying that it had never overheated.
Now, my V8 has a viscous fan and a big electric fan in front for that AC. I had a Frontera once with a viscous but no electric fan and the ac was ice cold.
So the question is, could I run my X5 with the fan removed and just leaving the electric fan?
Has anyone done such a thing on an M62 engine.
Why you ask.. Don't know really just interested.
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Clutch fan
Clutch fan
Not quite what your suggesting but I did fit a second electric fan with 2 stage switch 1 at 93c and second stage at 99c. Never heard the second stage kick in and only ever hear the first stage after stopping and switching off. Normally will cycle 1 or 2 times. I ran about for a while without one just the a/c fan and never had a problem. However it played on my mind and so I fitted the second one which should have a long life as it seems rarely used.