Wife's didn't work for an extended period of time.

As far as I know just assists heating cores. When it's really cold out say 0°C and lower, you get virtually no heat at idle. You can put in neutral and rev to 12-1500 to get heat at a long red light.

I replaced hers after she reported no heat at red lights. But there was an extended period of time where we used the neutral option.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)