Is it the decoupler or the alternator bearings?
In the last week or so of driving, I've noticed a low, rhythmic, ruh...ruh...ruh.. noise coming from the drivebelt side of the engine when the engine is under load - A/C compressor, putting it in gear, running quite a few accessories, etc.
I've scoped the source of the noise (long screwdriver to the head-style) down to the alternator assembly, but I'm wondering if there's a test that can be done that will tell me whether I should just replace the decoupler pulley OR whether the bearings in the alternator itself are on the way out, and I just need to swap the whole thing.
'05 Town & Country Touring
3.8L 148,000 mi