Hi, I have Citroen Xantia 1.9td 1997 P reg and I've discovered a leak in front passengers seat around the footwell. The liquid looks like coolant/antifreeze, and I suspect it's leaking from radiator (heater matrix). My question is, how should I go about replacing the heater matrix, do I need to remove whole of interior front panel, if so how should I go about doing that? Any useful help or advice will be much appreciated. Thanks, Alex