Follow up ...
It turned out to be a simple issue, unless the problem is chronic. Before bringing the car in for a Pre-Purchase Inspection, I reached under the seat, inspected for signs of wear or corrosion, and pressed on every single connector.
The heating started working again. Looks like a loose connection. Im going to keep my fingers crossed that a heating element wire in the cushion is not damaged and intermittently making contact ...
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2011 X3 35i with M pack + 2011 135i w/6SPMT | 255 square tire setup | Quaife 3.46 LSD | Diff lock down bracket | Bilstein B8+Swift SpecR springs+H&R FSB | CDV delete | BMS Oil Tstat bypass | ER FMIC & CP | N54Tuning DP | GC Street Camber Plates | M3 FCA +guide rods+RSFB's+Tranny mounts | Manzo toe arms | Cobb Stg2 agressive tune | Hawk DTC70 brake pads | RB SS brake pistons | Goodridge SS brake lines | Custom brake cooling ducts
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