I just looked under my 930 and discovered that some kind of aftermarket exhaust is installed. See photos here:
http://cmd.shutterfly.com/commands/pictures/slideshow?site=930photos&page=930photos&album=27
This may be the reason why my Auto Heat isn't functioning, eh? I'm guessing that the thermo sensor that kicks on the footwell blowers may be fried by this modified exhaust. But I'll check resistance on the sensor to be certain.
Any idea what brand exhaust this is?