I'm having trouble with my early '98 145 1.6TS where the passenger foot well is getting really cold when we drive along at motorway speeds. It feels like cold air is either getting into the cabin directly from outside or is somehow blowing past the heating element because at normal town driving speeds the heater blows nice and warm into both footwells. I was wondering if anyone knew where best to start before I start ripping things out to get at the heater?