Peterbilt 359 Engine Parts & Cooling

Frequently Asked Questions About Peterbilt 359 Engine Parts & Cooling

Will these cooling parts fit my specific year Peterbilt 359?

Most of our engine and cooling components are designed to fit Peterbilt 359 models from 1967 to 1987. However, there were several engine options available during production, including CAT 3406, Cummins NTC, and Detroit Diesel variants. Always verify your engine model and serial number before ordering. Key differences exist between early models (1967-1972) and later models, particularly in radiator mounting brackets and hose routing. Contact our tech support with your OEM if you need help confirming compatibility.

What are the most common cooling system failures I should watch for?

Based on customer feedback, the most frequent issues include radiator core deterioration (especially on trucks over 20 years old), water pump bearing failure around 150,000-200,000 miles, and thermostat housing corrosion. Many operators report coolant hose failures at the clamp connection points due to constant heat cycling. We recommend replacing all coolant hoses every 5-7 years as preventive maintenance, regardless of appearance. Fan clutch failure is another common issue that can lead to overheating under load.

Should I choose aluminum or copper/brass radiators for my 359?

Both materials have distinct advantages. Aluminum radiators typically offer 30-40% better cooling efficiency and weigh significantly less, making them popular for performance applications. However, copper/brass radiators are easier to repair in the field and tend to last longer in corrosive environments. For daily drivers and work trucks, many customers prefer copper/brass for its durability and repairability. Aluminum is often chosen for show trucks or high-performance builds where weight savings and maximum cooling are priorities.

What additional parts do I need when replacing my water pump?

A complete water pump replacement requires more than just the pump itself. You'll need a new gasket set specific to your engine model, fresh coolant (typically 12-16 gallons for a complete system flush), new hose clamps, and we strongly recommend replacing the thermostat simultaneously. Many customers overlook the fan belt, which should be inspected and likely replaced during this service. Budget an additional $75-150 for these supporting components beyond the water pump cost.

How difficult is it to install these cooling components myself?

Installation difficulty varies significantly by component. Thermostats and upper radiator hoses are typically 30-minute jobs requiring basic hand tools. Water pump replacement is intermediate level, usually taking 2-4 hours and requiring coolant system knowledge. Radiator replacement is the most complex, often requiring 4-6 hours due to shroud removal, transmission cooler lines, and proper mounting alignment. Many DIY customers successfully complete these repairs, but having a service manual for your specific engine model is essential. Always allow extra time for stuck bolts and unexpected complications on older trucks.