Frequently Asked Questions About Freightliner FLD SBA Fan Blades & Shrouds

What years and models of Freightliner FLD trucks do these fan blades and shrouds fit?

These fan blades and shrouds are designed specifically for Freightliner FLD models from 1989 through 2002, including the FLD112, FLD120, and FLD132 Classic. The SBA (Set Back Axle) designation refers to trucks with the axle positioned further back from the bumper. Always verify your specific engine model and fan clutch type before ordering, as some variations may require different blade configurations or mounting hardware.

Are these fan blades made of metal or plastic, and which material is better for heavy-duty use?

We carry both metal (aluminum and steel) and engineered polymer fan blades. Metal blades offer superior durability and are ideal for severe-duty applications or extreme temperatures. Polymer blades are lighter weight, which reduces strain on the fan clutch and can improve fuel economy by 1-2 mpg. For most over-the-road applications, high-quality polymer blades provide excellent performance and longevity while reducing rotating mass.

Do I need to replace the fan shroud when replacing the fan blade, and what problems occur if I don't?

While not always mandatory, replacing both components together is highly recommended. A damaged or ill-fitting shroud reduces cooling efficiency by up to 30% and can cause the fan blade to work harder, leading to premature clutch failure. Mismatched shrouds can also create dangerous blade-to-shroud contact during engine torque or frame flex. Proper shroud-to-blade tip clearance should be 0.5 to 1 inch all around.

What tools and time are required for installation, and can I do this myself?

Installation typically takes 1-2 hours with basic hand tools including wrenches, a fan clutch holding tool, and possibly a puller for stubborn clutches. The main challenges are working in the confined space and properly torquing the fan clutch hub bolts to specification (typically 45-55 ft-lbs). Many drivers successfully complete this repair themselves, but accessing certain mounting bolts can be difficult without removing the radiator. Always ensure the engine is completely cool before beginning work.

How do I know if I need a standard rotation or reverse rotation fan blade?

Looking at the engine from the front of the truck, standard rotation fans spin clockwise, while reverse rotation fans spin counter-clockwise. This is determined by your engine and fan drive setup, not personal preference. Installing the wrong rotation direction will drastically reduce cooling and can cause overheating within minutes. Check your existing blade for rotation arrows, or consult your engine serial number with our technical support team to verify the correct rotation before ordering.