Hi It does sound like them matrix , if it is dont be fooled by the," it a long job and expensive" its
not , the matrix is £62 off ebay , and with a bit of an easy mod to the pipes can be replaced in 1hr max , i know i did mine, very easy ,
DO NOT BE FOOLED by scarey comments of its a £1000 and the dash comes out,
The only reason the dash had to come out is because the pipes are solid , replace them with flexible pipes gets around that problem and reduces cost and time.
First buy matrix from EBay £62
Buy 1 metre of ½ inch water pipe and 4 x suitable jubilee clips
Begin by disconnecting the pipes under the bonnet that go in and out of the matrix.
From under the dash passenger side, remove the big black plastic air box that contains the cabin filter. (3 screws in the floor and bulk head)
Remove 3 inch flex pipe to heater.
Remove the clip that holds the cover to the pipes on the side of the matrix heater box.
Remove the 2 screws that hold the cover on the side of the matrix heater box.
Remove the glove box inner.
With some snips or hacksaw crush and cut the two pipes off the matrix and pull them through the bulk head out the way.
The matrix will now slide out from the heater box easy, and from under the dash.
With the new matrix cut a 2 inch section out of each pipe and replace with a section of hose, thus making the connection flexible.
Push the matrix back in the heater box and with your now flexible pipes, poke them through the bulk head.
Reconnect the pipes under the bonnet and replace glove box and heater parts, refill system remembering to bleed the matrix as well.
Job done, NOT EXPESIVE AND NO DASH OUT, easy.
sorry about the pics best i could do ,
Mick