Navistar Radiators – Browse Replacement Parts

navistar radiators

Navistar Aftermarket Radiators – Built to Perform, Ready to Ship

Keep your International® truck or IC Bus® running at peak performance with reliable replacement radiators from Active Radiator — your nationwide source for aftermarket Navistar cooling solutions.

Whether you’re maintaining a fleet of International® commercial trucks, IC Bus® school buses, or legacy Workhorse chassis, our extensive inventory of high-quality radiators ensures you’ll find exactly what you need to stay on the road and out of the shop.

Supported Applications

  • International commercial trucks (all series)

  • IC Bus school and commercial buses

  • Workhorse step vans and motorhome chassis

  • Navistar diesel engines and specialty vehicles

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Why Choose Active Radiator for Navistar Replacements?

OEM Quality Fit & Performance

Our radiators meet or exceed original equipment standards — ensuring a perfect fit, optimal cooling, and long-term durability for your Navistar vehicle.
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Nationwide Inventory & Fast Shipping

We stock the most in-demand Navistar radiator models and components, ready to ship from multiple warehouse locations across the U.S. For in stock parts we can get it to you in 1-2 business days.
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Custom Fabrication for Hard-to-Find Parts

Can’t find the exact part number? No problem. We offer custom-built radiators tailored to your specifications — ideal for older or discontinued models like the Workhorse chassis.
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Expert Support

Not sure which radiator fits your vehicle? Our experienced team is here to help you identify the right part quickly and accurately.
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Get Back on the Road — Contact Us Today

Don’t let a cooling issue sideline your operation. Trust Active Radiator for top-tier Navistar replacement radiators, unmatched service, and nationwide coverage.

Call us now or request a quote online to find your part today.

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Part Number Height Width Depth Filler Neck Product Inlet Outlet Oil Cooler 
64000234.687526.52.25NoneRadiatorRightLeftNone
6400034129.252.25NoneRadiatorLeftRightNone
6400044129.252.25NoneRadiatorLeftRightNone
64000535.625292.25NoneRadiatorLeftRightNone
64000635.625292.25NoneRadiatorLeftRightNone
64000732.437531.52.25NoneRadiatorleftRightNone
64000820.526.18752.25NoneRadiatorLeftRightNone
64000946.37529.252.25NoneRadiatorLeftRightNone
64001046.37531.52.25NoneRadiatorLeftRightNone
64001138.187526.52.25NoneRadiatorLeftRightNone
64001220.526.18752.25NoneRadiatorLeftRightRight
64001438.187526.52.25NoneRadiatorLeftRightRight
64001533.5282.25NoneRadiatorLeftRight / BottomNone
64001629.2532.752.25NoneRadiatorRightLeftNone
6400192229.6252.25NoneRadiatorLeftRightNone
64002040.187527.3752.25NoneRadiatorBottom RightTop LeftNone
6400232226.06252.25NoneRadiatorLeftRightNone
64002644.2527.6252.25NoneRadiatorRightLeftNone
64002840.18825.6252.25NoneRadiatorRightLeftNone
64009429.37537.1252.25NoneRadiatorRightLeftNone
64009828.528.52.25NoneRadiatorLeftRightBottom
64009944.2527.6252.25NoneRadiatorRightLeftBottom
64010028.528.52.25NoneRadiatorLeftRightBottom
6401033112.252.25NoneRadiatorRightRight Curved BottomBottom
64010427.62526.3752.25NoneRadiatorCenterBottom RightBottom
6401052229.6252.25NoneRadiatorLeftRightNone
64010829.7526.31252.25NoneRadiatorCenterLeft 90 DegreeNone
64010924.437528.52.25NoneRadiatorRightLeftLeft
64011044.25372.25NoneRadiator   
64011236.62528.752.25NoneRadiatorMid LeftBottom Right2.25
64011438.540.52.25NoneRadiatorLeftRightGrill Side
64011551.62525.8752.25NoneRadiatorLeftRightBottom
64011646.2535.752.25NoneRadiatorLeftRightNone
64011736.62528.68752.25NoneRadiatorRightLeftLeft
64011829.7526.06252.25NoneRadiatorCenterRightBottom
6401194632.752.25NoneRadiatorLeftRight 
64012029.7526.31252.25NoneRadiatorCenterRightBottom
64012135.2540.52.25NoneRadiatorLeftRightBottom Grill Side
64012238.540.52.25NoneRadiatorLeftrightBottom Grill Side
64012338.540.52.25NoneRadiatorLeftRightBottom Grill Side
6401253439.52.25NoneRadiatorLeftRightBottom
6401272712.252.25NoneRadiatorCenterRightGrill Side
64002725.37524.31252.1875NoneRadiatorLeftLeftBottom
64008135.539.56252.1875NoneRadiatorUpper LeftLower RightBottom
64009530.1875262.125NoneRadiatorTop CenterBottom RightNone
64009630.1875262.125NoneRadiatorTop CenterBottom RightNone
64009745.62534.752.125NoneRadiator  None
64010235.12540.52.0625NoneRadiatorLeftRight BottomBottom Grill Side
64012435.2540.52.0625NoneRadiatorLeftRightBottom Grill Side
64012840.62532.51.5NoneRadiatorLeftRightNone
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