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Discussion Starter #1 (Edited)
Hi all

This is for e39 540i 2001

It's been happening for about 3 months now. I start the engine, begin to drive, accelerate and hear the big cooling fan spinning at high speed ("whooooosh") with every acceleration (normal behavior, means fan clutch is fine?) but after 1 minute or so, fan stops speeding up (no more "whoooosh"), no matter if I accelerate or not - it keeps spinning at its standard speed but then aux fan kicks in. So after 1 minute, with every acceleration, aux fan starts to spin to cool the engine, while the big fan never speeds up until I stop the engine and start it again

I replaced fan clutch a month before this issue started to occur

Any suggestions?
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