How to replace Heater matrix ?

Can somebody pls explain me how to change heater matrixcf_emoticons__BangHead:

simple! take passenger under-dash tray out if tintop, if cabrio just look under knee bar. note plastic cover on side of central airbox, piop that off and matrix is revealed. disconnect the coolant hoses and slide it out, replace, done

you may want to disconnect the matrix pipes in the engien bay to get rid of as much of the coolant as you can from matrix, but some will still remain. if you have some corks or something bung the outlets up once the pipes are off, or tape up or whatever