My 190E Sportline has always had belt squealing problems that I've tried to address to no avail. I've replaced the tensioner twice, one was Febi, one was INA, both German made, INA is OEM. I've replaced the belt four times because of wear occurring, Dayco, Gates, and MasterPro. I've replaced the idler pulley twice. I've replaced the smog pump with a rebuilt one, I've replaced the alternator with a rebuilt one, I've replaced the AC compressor with a new one, I've replaced the power steering pump with one that doesn't leak. I've replaced the pulley on the power steering pump and water pump with what looked to be fairly new ones. The fan pulley bracket bearing has no slop in it. The water pump I haven't replaced but it doesn't seem to have any issues, no slop in it at all. Does anyone have any ideas why I would still be getting belt squeal when basically everything should be in working order? My other 190E Sportline has none of these issues.

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Current: 1975 450SEL, 83 300D, 88 Yugo GVX, 90 300D OM603 swap, 91 F150 4.6 4v swap, 93 190E Sportline LE 3.0L M104 swap, 93 190E Sportline LE Megasquirt, 03 Sprinter, 06 E500 4Matic wagon.