I've only recently noticed this, but every morning the rear seat blower comes on high for about 90 seconds. I've tried different combinations of front settings including turning everything off the night before. But the rear still comes on. Is this normal and I never noticed it before?

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'04 E53, 4.4 Sport
'97 E39 528i
'86 911 Carrera, track car
'96 BMW R1100R