Onan Radiators – Browse Replacement Parts

How can you tell if the radiator is repairable or if you need a new one? Major fluid leaks are a common indicator that a new radiator is your best option. If you’re not sure, schedule a servicing appointment with your closest Active Radiator location, and our technicians will evaluate your needs.

If your Onan radiator is beyond repair, Active Radiator has the most popular Onan replacement parts in stock across the US.

Experience the Active advantage today! We’ll help you get your equipment back in service quickly and with minimal downtime. Find a location near you to buy a Onan radiator replacement.



Part Number Height Width Depth Filler Neck Product Inlet Outlet Oil Cooler 
4501044826.18752.25NoneRadiatorLeftRightNone
45012434.12526.252.375TopRadiatorRightRightNone
45018032.37525.6253.0625Top CenterRadiatorLeftLower Left 
4502011912.5625 NoneRadiatorLeftRightNone
45029127.5182.75Top CenterRadiatorTop LeftBottom leftNone
45049932.37525.68753.25CenterRadiatorLeft of CenterLeft None
45050525232.25CenterRadiatorCenterLeftNone
45060721.62523.81252.375Right TopRadiatorRightLeftNone
45077418.7511.521.5 Radiator   
45078938.2517.7853.69 Radiator   
4507983428.252.375 Radiator   
45085167.5824.5NoneRadiator   
45092825.62525.6252.375CenterRadiatorCenterRightNone
45093132.37527.6252.375CenterRadiatorLeft CenterLeft CenterNone
4510072625.6252.375CenterRadiatorRightRightNone
4511252522.81252.8125CenterRadiatorCenterLeft / RightNone
45113931.522.43753.875LeftRadiatorCenterLeftNone
45116125.525.752.8125CenterRadiatorRightLeftNone
45118353.87548.3752.25CenterRadiatorCenterRightNone
4514134639.56253.875LeftRadiatorRightRightNone
45143732.37525.68753.25CenterRadiatorCenterLeftNone
4514481717.43752.375CenterRadiatorCenterRightNone