1936 ford pickup dash

[rbdrake]

I am restoring a 36 pickup. I notice on some pictures there is some knob to the right of the glove box. What is it for? Mine has been plugged and bondo'd

Roger

 

[Brendan]

someone drilled that hole, its not factory

 

[nelsb01]

That could be the knob to control the vent for the manifold heater opening in the cowl. See if you can find a picture of the inside cowl on the passenger's side. Should show a 4 inch round grille type face. It would pull to open and pushed in to close.
Not much of a heater.