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      10-19-2012, 08:47 PM   #3
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Drives: E92 M-sport
Join Date: Feb 2011
Location: Southeast

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This from E12 and E39 experience: failure of the aux fan in front of the radiator. When not at highway speeds, warm weather and a/c load will overpower rad + fan alone.

With electric water pump, it either does or doesn't. WP failure will cause overheat under all circumstances. T-stat stuck closed will result in the same result.