I rebuilt Ol' Roy's heater a few years ago and it really cranks out the heat. Unfortunately the cab isn't exactly hermetically sealed so cold air comes in around the parking brake, driver vent, loose windows, cowl vent and probably some other places I haven't found. No toasty cab for me!

1950 Chevrolet 3100 (Ol' Roy)

1939 Packard Standard Eight Coupe (The Phantom) | 1956 Cadillac Coupe de Ville (The Bismarck) | 1964 Ford Galaxie 500 coupe |1966 Ford Mustang (Little Red) | 1969 Pontiac GTO (The Dishpit) I 1979 Ford F-100 | 1976 Ford F-150 (Big Red) | 1995 Ford F-150 (Newt)