1221- AirSource Blower Resistor

The AirSource 1221 is a 12‑volt, 4‑speed, 4‑terminal blower resistor designed for use in Navistar trucks and certain IHC (International Harvester) models. It is also marketed under the MEI/AirSource brand as part of the MT1361 series 

Key Specifications

• Voltage: 12V DC

• Speeds: 4 speeds (blade‑type terminals)

• Terminals: 4‑terminal configuration

• Mounting: Screw‑in style

• Application: Navistar trucks, IHC trucks