No heating in my 08 impreza wrx

[Matt234]

Hi all, require some help please. I dont have heating, i have changed thermostat, heating switches and the blend door actuator. But this hasnt helped. The only thing left as far as i am aware is the heater matrix, before i do this is there anything else first?

I have bled the system fully, and the heater matrix in the car isnt blocked.

Please help. Thanks, Matt