If you're interested in keeping your truck looking old school, several vendors offer reproductions of the original accessory coolant recovery unit mentioned by John Milliman above.
Here's one offered by Classic Parts if your so inclined.
~ 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)
