ford fiesta 1.7 2000 heater matrix removal?

I have a ford fiesta flight on a y reg. The heater matrix has failed and
> needs replacing, is it necessary for me to remove the dashboard of the car
> to get to the matrix or can it be removed without taking the dash out. I
> believe that this is the problem as the heater blows cold constantly. I
> have tried removing the heating valve altogether and replacing with just a
> piece of pipe to elliminate that as the problem. but still the heater
> blows cold. I have replaced the thermostat too. I believe that there is
> nothing else it could be except for the matrix. Thanks in advance for your
> help.
>
> Kind regards
>
> Jonn Rothwell
>