Wife’s car will act pretty similar and seems to be related to the sampling fan in the dash.

Example: my car will stay nice and cold when set to 73°, or nice and warm when set to 73°.

Hers on AC tend to have to use 69-70 or 75-76 to get the same cabin heat.

I’ve cleaned the grill on the sampling fan and it improves, but never as good as my car.

A good test for the sampling fan is with the controls on auto , set the temp lower until the fan speed drops to almost nothing that will tell you what the dash thinks the temp of the cabin is. If that doesn’t match it’s almost certainly the sampling fan

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