Ok after having the dash apart several times I've stuffed up the vacuum lines running to the back of my heater/aircon unit.
It was blowing hot air all the time, and when you pressed the recycle air button the air would only come out of the windscreen vents. Then I pulled it apart again, and changed a few hoses and all seemed to work fine.
But now when I try to turn the heater on, it only blows cold air.. All the other buttons seem to work fine…

Does anyone have a picture of where each line runs??

Cheers