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Most of the aftermarket E53 aux fans available in the US are made in China and are of uncertain quality.
2 yrs ago, I bought a Taiwan-made fan by TYC for my E53 and have been happy with it.
I would buy another TYC fan for any of my BMW's.
I did some research and TYC has been making electrical auto parts for about 60 yrs. I bought the fan on Amazon and it came with a lifetime warranty from TYC. It was 1/3 the price of a Genuine BMW fan.
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'03 530i - manual swapped - 425k miles
'06 325Cic auto 115k
'05 X5 3.0 auto 158k
'99 E39 528i 5-speed 130k
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