Bill - It may help to define which heater your neighbor would like to have in his truck. Would it be an Air FLow (aka Fresh Air) Heater/Defroster or a Recirculating Heater/Defroster. These pages are from a 1951 Chevy Accessory Manual, but represent the two style of accessory heaters available for 1952 also.
Below are just sample pics of each style.
~ Dan 1951 Chevy 3 window 3100 Follow this story in the DITY Gallery "My Grandpa Carl's Truck and How it Became Mine" 1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver) US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)
