Ac Aceca Heating system - motor or just air from the intake tube?

[SpqrEddie]

Thank you Chris!
Very helpful.
At the moment there is nothing in between the space between the radiator and the grille. So it might have been taken apart durign the life of the car.
Do you or somebody else happen to have a photo of how it was installed?
Interesting to know about the integrated switch. at the moment i see two pull knob, i will try to rotate them. but they seems only push pull. One open the air shut, the other the water circuit.
Thanks!
Eddie

[SpqrEddie]

In attachement the photos of what i see behind the grille.

If i understand correctly, at the end of the duct hose there should be a fan motor, right?

Any picture of one installed? and any info on the switch?

I belive it is the same of the Austin Healey Sprite as they share the squared heater exchanger box: https://www.ahspares.co.uk/austin-healey/sprite/cooling-heater/heater-blower-assy-complete.aspx

thanks!
Eddie