Frequently Asked Questions About Freightliner FLT Cabover Radiators

What years and models of Freightliner FLT cabovers do these radiators fit?

Our Freightliner FLT cabover radiators are designed to fit FLT models from 1978 through 1991, including the FLT86, FLT104, and FLT120 series. Each radiator listing specifies exact model compatibility. Common applications include trucks with Caterpillar 3406, Cummins Big Cam, and Detroit Diesel engines. Always verify your specific engine model and radiator part number before ordering, as some FLT models had mid-year changes that affected radiator dimensions.

Are these radiators made of aluminum or copper/brass, and which is better for my FLT?

We offer both aluminum and copper/brass radiators for FLT cabovers. Aluminum radiators typically weigh 40-50% less and provide excellent cooling efficiency with wider tubes and improved airflow. Copper/brass radiators offer superior durability and are easier to repair in the field, making them popular with owner-operators who service their own equipment. Both materials meet or exceed OEM cooling specifications. Your choice depends on whether you prioritize weight savings or traditional serviceability.

What are the most common installation challenges when replacing an FLT cabover radiator?

The most frequent installation challenges include: (1) Accessing mounting bolts behind the cab - you may need to tilt the cab for easier access, (2) Aligning the lower radiator support cushions properly to prevent stress cracks, (3) Ensuring all hose connections match - some aftermarket radiators have slightly different inlet/outlet positions, and (4) Properly gapping the fan shroud to maintain adequate clearance. Plan for 3-5 hours of labor if doing the installation yourself, and always replace hoses and clamps during radiator service.

Do these radiators come with mounting hardware and what additional parts might I need?

Most radiators ship as core units only, without mounting hardware. You will typically need to reuse your existing mounting brackets, rubber isolators, and bolts unless they show signs of wear or damage. We recommend purchasing new radiator hoses, hose clamps, a thermostat, and fresh coolant for a complete installation. Some customers also replace the overflow tank and radiator cap while the system is apart. Check individual product descriptions for any included accessories.

How do I know if I need a 2-row, 3-row, or 4-row radiator for my FLT?

The number of rows needed depends on your engine size, typical load weight, and operating conditions. Stock FLT cabovers with standard engines typically used 2 or 3-row radiators. If you are running heavy loads, have increased horsepower, or operate in extreme temperatures, a 4-row radiator provides additional cooling capacity. Check your existing radiator core or reference your VIN-specific parts manual for OEM specifications. When in doubt, choosing a radiator with equal or greater row count than original ensures adequate cooling performance.