Peterbilt 375/377 Radiators

Frequently Asked Questions About Peterbilt 375/377 Radiators

Will this radiator fit my Peterbilt 375 or 377 without modification?

Radiators for the 375/377 are built to match factory core dimensions and mounting points for these chassis, but fitment can vary depending on engine option, cooling package, and production year. Always check the listed specifications and compare them against your truck's original radiator or VIN details before ordering to confirm a direct fit.

What materials are these radiators made from, and how does that affect durability?

Most replacement radiators in this category use aluminum cores paired with either aluminum or plastic tanks, depending on the manufacturer. Aluminum cores offer strong heat dissipation and resistance to corrosion, while the tank material can influence long-term durability under vibration and heat cycling. Reviewing the specific construction details for each listing will help you choose the option that best matches your truck's duty cycle.

Can I install a replacement radiator myself, or should I have a shop do it?

Radiator replacement on a 375/377 involves draining coolant, disconnecting hoses, and removing mounting hardware, which is manageable for someone comfortable with basic mechanical work and the right tools. However, because proper alignment and hose routing are important for effective cooling, many owners choose to have the installation done or at least checked by a qualified diesel technician.

How do I know if I need a new radiator versus having mine repaired?

Common signs that point to replacement rather than repair include persistent overheating, visible cracks in the tank, leaking at the core rather than a hose or seam, and internal corrosion that restricts coolant flow. If your current radiator has minor external damage or a single leak point, a repair may be sufficient, but widespread core damage typically calls for a full replacement.

Do these radiators come with a warranty?

Warranty coverage varies by manufacturer and specific product, so it's important to check the warranty information listed on each individual radiator's product page. If you have questions about coverage terms before purchasing, our customer service team can help clarify what's included for a specific part number.