Frequently Asked Questions About Peterbilt 359 Radiator Tubes, Gaskets & Hoses
What years do these radiator components fit, and are they compatible with both factory and aftermarket radiators?
Our Peterbilt 359 radiator tubes, gaskets, and hoses are designed to fit models from 1967 through 1987. Most components work with both OEM and aftermarket radiators, but fitment can vary depending on your specific radiator manufacturer. We recommend checking your radiator's inlet/outlet sizes before ordering. Standard factory radiators typically use 1.75" upper and 2" lower connections, while some aftermarket units may differ. If you're unsure, contact us with your radiator brand and we'll help verify compatibility.
Are the radiator hoses made from EPDM or standard rubber, and what temperature range can they handle?
The majority of our radiator hoses are constructed from EPDM (Ethylene Propylene Diene Monomer) rubber, which offers superior heat resistance compared to standard rubber. These hoses are rated for continuous operation between -40°F to 257°F (-40°C to 125°C), with brief exposure tolerance up to 275°F. EPDM hoses also resist ozone cracking and coolant degradation better than standard rubber. All hoses feature reinforced fabric or wire construction to prevent collapse under vacuum conditions.
Do I need special tools to install these components, and how difficult is the installation?
Installation is straightforward and typically requires only basic hand tools: screwdrivers, pliers, and a socket set. Most drivers can complete a hose replacement in 30-45 minutes. The main challenges involve accessing lower hose connections and ensuring proper clamp positioning. We recommend having a coolant catch pan, new clamps (if not included), and fresh coolant on hand. Some tight clearances around the fan shroud may require removing it for easier access. Always install hoses with the engine cool to avoid burns.
What's the difference between molded and flexible radiator hoses, and which should I choose?
Molded hoses are pre-formed to match factory routing and provide the best fit with minimal risk of kinking. They're ideal if you have stock radiator positioning and want a clean, original appearance. Flexible or universal hoses offer more installation versatility and work well if you have a custom radiator setup or need to accommodate non-standard routing. Molded hoses typically last longer due to their reinforced bends, while flexible hoses may require careful routing to prevent sharp bends that can restrict flow.
How often should radiator hoses and gaskets be replaced, and what are the warning signs of failure?
Under normal conditions, quality radiator hoses should last 4-5 years or 50,000-75,000 miles. However, severe duty applications may require more frequent replacement. Check hoses every oil change for soft spots, bulging, cracking, or wetness at connection points. Gaskets typically last 5-7 years but should be replaced whenever you service the radiator. Warning signs include coolant residue around fittings, spongy hose feel when squeezed, visible surface cracks, or any coolant odor in the engine compartment. Replace hoses in sets rather than individually to ensure consistent reliability.
