The heater’s motor was seized up from a dose of BiCarb of soda so the only option was to tear it apart and rebuild it. Even the gasket betwen the heater and the body was perished but as can be seen and i have seen this on all heaters,the gasket was never fitted properly,resulting in a turned down lip.
The rat nest didn’t help air circulation
Controls were stripped , bulbs changed, everything cleaned and reassembled. Should look nice in the dash, eventually.