Hi,
That is certainly the belt. It needs replaced before it breaks or damages something under there such as wiring.
Here are directions for replacement. There are a couple different designs, but these directions will indicate both. The pics attached correlate with the directions.
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2005 BMW X3 3.0i (E83) L6-3.0L (M54)
Replacing Alternator Drive Belt (M52/S52/M52TU/M54/M56)
Vehicle Engine, Cooling and Exhaust Engine Drive Belts, Mounts, Brackets and Accessories Drive Belt Service and Repair Removal and Replacement Replacing Alternator Drive Belt (M52/S52/M52TU/M54/M56)
REPLACING ALTERNATOR DRIVE BELT (M52/S52/M52TU/M54/M56)
11 28 010 - Replacing alternator drive belt (M52/S52/M52TU/M54/M56)
Note:
If the drive belt is to be subsequently reused:
Mark direction of travel and reinstall drive belt in same direction of travel.
Necessary preliminary tasks:
- Remove fan clutch with fan impeller
- Remove A/C compressor drive belt See: Drive Belt > Removal and Replacement > Replacing A/C Compressor Drive Belt (M52/S52/M52TU/M54/M56)
- E85/E60: Remove radiator cover
- E85/E60: Remove fan cowl
pic 1
Remove cap from tensioning roller.
Pic 2
Relieve tension on belt drive.
Remove drive belt.
Important!
Drive belt must be replaced if fouled with hydraulic fluid.
Installation:
Check drive belt for coolant and oil residues, replace if necessary.
Pic 3
Installation:
Check that belt is correctly positioned on belt pulleys.
Pic 4
Version with auxiliary tensioning roller.
Pic 5
Installation:
Locking device of auxiliary tensioning roller must snap into groove on alternator.
Pic 6
Version on E85.
Pic 7
Version on E60/E65.
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Let me know if that helps. Also, make sure that the belt hasn't damaged anything which may be why you have a coolant leak.
Joe
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Sunday, August 23rd, 2020 AT 6:05 PM