[PeterC]

Here is the way I handled the heat in my 35 Three Window Coupe. The pull cable on the dash actuates a hidden on/off valve under the dash the controls the flow of hot water to the 1940 Ford Heater. Also - I did not run the supply hoses through the firewall - rather they run along the passenger inside frame rail in the engine compartment and enter hidden behind the passenger side kick panel up and over to the heater - so as you can see - in the engine compartment and the interior alike - the heater hoses are near undetectable and the heat has precise control!