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Wow. From what I remember, the blending dial isn't tied in with the IHKA and shouldn't have any effect with the control unit. The other air flaps are controlled by the IHKA though. Is it possible one of the stepper motors for the air flaps could be failing/shorting to ground and overheating the IHKA? If they happen to be on the same power circuit as the blending flap, changing the state of the blending flap could alter the total current draw to something manageable by the control unit. How is the overall system air flow? Do you get about the same amount of air coming from all 3 levels if you adjust them one by one? If you have blockage somewhere, you could be overheating the FSR due to the control unit asking for higher and higher heat and not getting it?
Aftermarket radio or other non-factory parts in the vicinity?
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Olympic Peninsula, WA, USA
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2005 Mini Cooper 100k, British Racing Green/Silver-Black
04/2002 4.6is 140k, Silver/Black-Alcantara *FOR SALE*
1989 325iX 270k, Diamond Black/Black
1984 318i 370k *SOLD* (First Bimmer)
Honorable Mentions: '71 2002, '87 325, '90 325ic, '92 525it, '93 325i, '94 530i
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