Replaced the aux fan today and its working now! I went with the TYC brand as it received good reviews on amazon. This my second replacement so far. The first replacement was a BEHR I believe and it lasted a few years, maybe 4-5 if I recall. Given that my car has 178k miles, didn't seem to make sense to justify the OE fan.

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2005 BMW X5 3.0i
2013 BMW M3 Competition