BT 1131 – Blue Bird, Carpenter, Navistar International and Spartan Charge Air Cooler


The BT 1131 all aluminum charge air cooler is an exact fit, OEM replacement for Blue Bird Bus, Carpenter Bus, Navistar International Fire Trucks, Navistar International 3000 Series Trucks, Navistar International 4000 Series Trucks, Navistar International S Line Class 6 Trucks, Navistar International S Line Class 7 Trucks, Spartan Bus and Spartan Fire Trucks. Manufactured in the USA using controlled atmosphere brazing, the epoxy-free core measures 23.08 inches from header to header, 29.88 inches from side to side, and 1.63 inches thick. Aluminum tanks are TIG welded to the core to provide the strongest possible bond and has a 3.5 inch inlet and outlet. Each unit is individually tested prior to shipping and guaranteed to be 100% leak free.

Core Measurements
Click for image
23.08 29.88 1.63
Additional Info

For Fire Trucks, please verify the header to header measurement (inside of header to inside of header) with the core A measurement.

Additional Details
Inlet 3.5 inch
Outlet 3.5 inch
Matching Core BT 40