Be sure you both have the polarity AND blade direction correct. The blade unit on a lot of the aftermarket fans can be reversed and the blades are directional so they are supposed to spin one way obviously (leading edge / trailing edge thing). To reverse the fan (change from puller to pusher or vice verse) you both swap the polarity AND flip the fan blade around.
2003 M3CicM6 TiAg
2002 540iT Sport Vortech S/C 6MT LSD TiAg
2008 Audi A3 2.0T DSG (the daily beater)
2014 BMW X1 xDrive28i (wifemobile)
Former:
1985 MB Euro graymarket 300SL
1995.5 Audi S6 Avant (utility/winter billetturbobattlewagen)
LOL. Props for honesty man! Too many guys would say “uh I found a wiring problem” and not fess up!
The symptoms - reverse install fan was ok “sometimes” like when you were sitting still but when the Aux was NOT running, mostly fine at highway speeds... all exactly what you’d expect.
2003 M3CicM6 TiAg
2002 540iT Sport Vortech S/C 6MT LSD TiAg
2008 Audi A3 2.0T DSG (the daily beater)
2014 BMW X1 xDrive28i (wifemobile)
Former:
1985 MB Euro graymarket 300SL
1995.5 Audi S6 Avant (utility/winter billetturbobattlewagen)
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