Though written for rear radiator, the process is virtually the same for side radiator except the dirt will be on the outside-most thing (inter-cooler or A/C condenser): On all coaches, but PARTICULARLY REAR RADIATOR coaches, the CAC (Charge Air Cooler, also called inter-cooler or after-cooler by some manufacturers) and radiator need to be cleaned AT LEAST ONCE A YEAR. You can verify that you actually need to clean them by taking a strong flashlight. Access the engine from the TOP (bedroom). Sh