I have a 2000 S500 W220, the cooling fan is loud like a bearing is bad but I'm not sure if the motor is inside the fan blade or if the fan blade is belt driven by a external motor. what would be the worst case senerio the fan blade stops working and the engine over heats? Could someone giveme some insight to this.

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'85 F250 6.9L diesel 2wd XL XC LB Centurion, Gone
'95 Mercedes E 300 Diesel W124.131 with a OM606.910 and just over 200k on the clock, needs top end engine work and a transmission.
2000 S500 W220 with a 5.0L V8 gas power.