Frequently Asked Questions About Freightliner FLD SBA Radiator Tubes, Gaskets & Hoses

Will these radiator hoses and tubes fit my specific year Freightliner FLD?

Our radiator tubes, gaskets, and hoses are designed to fit Freightliner FLD models from 1989 through 2001. However, there are variations between FLD 112, FLD 120, and FLD Classic models. Always verify your truck's specific model designation and engine type (Cat 3406, Detroit Series 60, Cummins N14, etc.) before ordering, as different engines may require different hose configurations and lengths.

What's the difference between OEM and aftermarket radiator hoses, and which should I choose?

OEM hoses typically use EPDM rubber rated for temperatures up to 257?F and feature reinforced fabric plies for durability. Quality aftermarket options often match or exceed OEM specifications at a lower price point. Look for hoses with 4-ply reinforcement, proper temperature ratings, and correct inside diameter measurements. Many drivers report excellent results with aftermarket options that meet SAE J20 R3 specifications.

How difficult is it to replace the lower radiator hose on an FLD, and what tools do I need?

Replacing the lower radiator hose requires basic hand tools: hose clamp pliers, a drain pan (capacity of at least 4 gallons), and potentially a hose pick for stubborn connections. The main challenge is limited access space between the radiator and engine. Most experienced drivers complete the job in 45-90 minutes. Tip: Replace both upper and lower hoses together, as they typically wear at similar rates.

My radiator hoses keep failing prematurely. What am I doing wrong?

Premature hose failure often stems from three main issues: over-tightening clamps (which cuts into the rubber), system overpressure from a faulty radiator cap, or electrochemical degradation from improper coolant maintenance. Ensure your radiator cap maintains proper pressure (typically 15-16 PSI for FLDs), use constant-tension clamps when possible, and maintain proper coolant pH levels between 8.5 and 10.5.

Do I need to replace gaskets when changing radiator hoses, and which sealant should I use?

While hose connections typically don't require gaskets, you should inspect and replace any thermostat housing gaskets, water pump gaskets, or radiator tank gaskets if disturbed during hose replacement. For connections requiring sealant, use a non-hardening compound like Permatex Aviation Form-A-Gasket rather than RTV silicone, which can break loose and clog cooling passages. Always clean mating surfaces thoroughly before applying new gaskets or sealant.