Frequently Asked Questions About Peterbilt 375/377 Radiators

Will these radiators fit my specific Peterbilt 375 or 377 model year?

Our Peterbilt 375/377 radiators are designed to fit models from 1987 through 2007. However, there are variations depending on your engine type (CAT 3406, Cummins ISX, Detroit Series 60) and whether you have a standard or extended hood. Before ordering, check your existing radiator's core dimensions and inlet/outlet locations, or contact us with your VIN for exact fitment verification.

What's the difference between aluminum and copper/brass radiators for my truck?

Aluminum radiators are lighter (typically 40-50% less weight), offer better cooling efficiency, and resist corrosion well. Copper/brass radiators are more traditional, easier to repair if damaged, and generally cost less upfront. For most 375/377 applications, we recommend aluminum for better performance and longevity, especially if you're hauling heavy loads or operating in hot climates.

Can I install a new radiator myself, or do I need a mechanic?

Installation typically takes 2-4 hours for someone with basic mechanical skills. You'll need to drain coolant, disconnect upper and lower hoses, remove the fan shroud, and unbolt the radiator mounting brackets. The main challenges are proper coolant disposal, ensuring all connections are secure to prevent leaks, and properly bleeding air from the cooling system. If you're not comfortable with these tasks, professional installation usually runs $200-400.

How do I know if I need a single or dual core radiator?

Single core radiators work fine for standard applications and lighter duty cycles. Dual core radiators provide approximately 30% more cooling capacity and are recommended for heavy hauling, mountainous terrain, or if you've increased your engine's horsepower. Check your current radiator's specifications or look for a part number tag on the top or side tank to determine what you currently have.

What warranty coverage should I expect, and what voids it?

Most quality aftermarket radiators for Peterbilt 375/377 trucks come with a 1-2 year warranty covering manufacturing defects and leaks. Warranty is typically voided by improper installation, running incorrect coolant mixtures, operating with low coolant levels, or physical damage from road debris. Always use the recommended 50/50 coolant mixture and maintain proper coolant levels to ensure warranty protection.