Home > Kenworth Heater Box > (Mid-2014 & Newer Day Cabs) Plug & Play Kenworth Heater Box

(Mid-2014 & Newer Day Cabs) Plug & Play Kenworth Heater Box


Enhance your Kenworth’s HVAC system with our premium stainless steel box assembly, effortlessly replacing OEM part numbers F31-1221-11110 and F31-1288-11110. Designed for mid-2014 and newer day cab W900, T800, T600, C500 models.

Use our selection tool for a precise fit. Ensure a rust-free future and a trouble-free installation. Enjoy superior airflow with our advanced unit. Fully assembled and ready to mount, it’s the HVAC upgrade your system warrants. Have questions or ready to upgrade? Contact us at (616) 834-1503.

SKU: F31-1221-10SS-3


  • Evaporator
  • Heater Core
  • Blower Motor
  • Expansion Valve
  • Thermostatic Switch
  • Receiver Drier
  • 2 Hard Steel Lines
  • Electronic Operated Door Actuator
  • Gaskets
  • Fresh air intake and door weldment
  • Stainless fasteners

Our boxes are built with 18 gauge 304 stainless steel. Unlike most aftermarket competitors, we spot weld our boxes for added strength. We offer free shipping in the lower 48 states and Canada. See our other Kenworth heater box options here.

OEM Cross References:

  • F31-1221-11110
  • F31-1288-11110

Additional information

Weight 52 lbs
Dimensions 25 × 25 × 21 in



T400, T800, W900


2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022


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