There was a coolant recovery tank (overflow/expansion/whatever) available as a dealer installed option/accessory. I found mine on a truck show show swap meet table a few years ago (NOS). It has since had much of its writing/instructions ablated. If you have a factory Harrison heater installed, it won't go in the intended spot.
~ John
A kid raised on Hotwheels, Matchbox and Tonka cannot be reasonably expected to own only one vehicle as an adult.
1949 Chevrolet 3804 In the Legacy Gallery | In the Gallery Forum 1973 IH 1310 Dump 1963 Kaiser M38A1 2001 International/AmTran RE3000 "Skoolie" 2014 Ford E-350 4x4 (Quigley)