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Seek to understand,^Value
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We still don't have the definitive answer ... but we've been working for about a year to identify which FSUs to buy and which NOT to buy ...

See details here which 'should' apply to the E46 ...

- What is the right brand of BMW E39 FSU (aka FSR) to purchase (1) (2) when your interior heating & air conditioning HVAC/IHKA blower motor goes haywire (1) (2) (3) (4) (5) (6) (7) (8) & how to repair your own final stage resistor including an autopsy & wiring diagram schematic (1) (2) and why a bad final stage unit will cause the battery to drain overnight (1) (2) (3) & how to isolate and replace the E39 blower motor (1) (2) (3) (4) & how not to replace the FSU (1)
 
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