I was determined to do it and I did.
I changed the heater matrix without taking out the dash.
Unfortunatly its has to come out again, while using brute force and not paying attention I managed to break one of the flap that controls the heat but not too bothered as I could proberly have it out in about an hour now I know what im doing.
Didnt do a a pic by pic on how to as I just wanted to get it done but I will do one when it comes out again.
Also my lack of heating when the temperature rises to 100 has gone too.