I'd go for heater matrix too.
Nothing terribly technical about changing it (if it's the model I think it is!).
Drain coolant
Remove hoses to matrix (in engine bay)
Remove centre console
Remove heater ducting
Undo matrix cover and matrix
Wiggle it out through the gap
Remember there will be water in the matrix, you might want to cover the seats etc.
Best to buy the Haynes manual to be on the safe side!!
You could just join the two hoses from the engine to the matrix together with a bit of pipe and a couple of jubilee clips as a short term fix but you will, obviously, have no heater.
victor
April 2009