bolted down under the center console, but I managed to pull it out from each side from under the door trims instead - under the carpet is the original polytyrene lump in the passenger well and a small poly lump under the clutch foot rest area. Under these and the rest of the pan is a foam/carpet underlay - I pulled this up and saw what my car would've looked like the day it ran out of Born
- ANyway I digress - there is definately no sign of water/coolant anywhere on the floorpan in either the passenger or driver's footwells - I can't see this matrix thing you mention, but that's probably because I cant pull the carpet away far enough along the centre console - but I pushed my fingers underneath and had a good feel and I cannot detect any damp at all...So I guess (is this a fair comment?) my matrix isn't leaking - so the lack of heat is almost certainly a duff thermostat, but what about the smell and the (now slight) fog that comes out of the vents (I guess the fog will return more when the thermostat works)? Took the opportunity to check the drain holes under the bonnet (I've been caught by these being blocked on previous 480s), but they are totally clear.
Where do I look next for the source of this bad smell (TCP/Hot electronics) and the off fog (and the misting windows of course, although this has also lessoned (again probably because of the thermostat)
