I returned to this regular customer of mine to fix up the non-working heating system.
Turns out this early model does not have a blower motor fitted and uses moving exterior air for heating. Turns out the cables for the flaps were all kinked and the flaps siezed up. The dash needed removing to that all the components could be replaced or repaired.
There is some bodywork to be done on this van later when the weather improves.
February 15th 2021