One of the two aux fans on my 124 went this time last year. When I removed the fan for replacement, I noticed a ton of road junk caught between the fan motor and the AC condensor essentially restricting any airflow to the vents of the motor. I believe that this ultimately caused the failure.

Perhaps periodic cleaning of this vital area could save someone $131 and a few knuckle scrapes.

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1996 (W210) E300D 86K - Traded in for a Lexus
1992 (W124) 300D 2.5 Turbo 202K - Sold
1983 (W123) 300D, 146K - Sold
1970 280S, 263K - Sold - Beginning of addiction