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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Thu, Jul-12-2018, 12:31:22 AM   #41
qualicas
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Default Re: 2003 M3 overheating THE WEIRDEST THING

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Originally Posted by Braymond141 View Post
Thatís not how the mechanical fan works. The idea is to give you airflow at idle to low engine speeds and then to declutch in higher revs (where road speed and forced airflow take over). Why do you think it is a clutched fan and not a solid mount?! This eliminates parasitic drag for engine performance and also keeps the centrifugal force low on the fan so it doesnít blow apart at 8200rpm. Itís whole potential seen IS at idle, when hot, and when in good working order.
You stopped your explanation too soon. At higher speeds or when the rad is heating, the hot air makes the fan engage again for more airflow to cool things down. Ever drive next to a semi going up hill and all of a sudden their fan kicks in, you will hear it. I don't think I have heard an M3 fan kick in but then my hearing is terrible. I chased an overheating problem on a new truck I had. It would overheat pulling a tent trailer on highway. Finally replaced the fan clutch and problem solved. Those fans are thermostatically controlled with the spring you see in the middle.
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Discussing 2003 M3 overheating THE WEIRDEST THING in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)