Quote:
Originally Posted by guntherrex
Ok, still annoyed by the wooshing noise while driving, I decided to look a bit further into the clutch fan. With the car off it moves freely, with a good damping. Seems ok. Then I started the car (cold), the fan should be easy to stop from what I see on youtube... guess what: that's not stopping unless you do some serious damage (or turn the car off of course)
The funny thing is that usually when driving away with a cold engine when I get up to speed the noise drops at around 2500/3000rpm and the car sounds great. so that seems the fluid returns as normal and the clutch function actually works for a while. When the car gets hot again the fan gets loud, which I suppose is a good thing.
What worries me is that I don't know if this fan is properly capped at 2500rpm, because I can hear the pitch go up after that RPM range. This is a new fan that was installed after the old one grenaded and messed up the engine bay.
My feeling is I should replace the clutch fan again...
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I am sorry not to see/respond to this earlier. You are describing the correct operation of a working fan clutch... It grabs on cold start up and sounds like a bus (whooshing). Then it will release and sound quiet. When engine temp warms up - particularly in traffic, it will grab again and cool the engine, which is what you want.
There are differences in the different brands. The Meyle fan clutch makes the most noise, and doesn't release as quickly on cold start ups. The Behr /Sachs (OEM) fan clutch is much quieter.. I buy the Behr/Sachs when I can.
But I recently discovered that both my fan clutch and aux fan (elec) were bad. Since I had two, new Meyle fan clutches in my parts pile, I installed one and was back in business. If the sound really annoys me, I will switch to a Behr/Sachs unit..