Peterbilt 330/335/337 Radiators

Frequently Asked Questions About Peterbilt 330/335/337 Radiators

Will these radiators fit my specific Peterbilt 330, 335, or 337 model year?

Most aftermarket radiators for Peterbilt 330/335/337 trucks fit model years 2005-2015, but critical differences exist between early and late models. Pre-2008 models typically use a 2-row core design, while 2008 and newer often require 3-row or 4-row cores. Always verify your existing radiator's part number and core dimensions before ordering. Key measurements include core height, width, and inlet/outlet sizes. Contact our team with your OEM if you're unsure about compatibility.

What's the difference between plastic tank and all-aluminum radiators for these trucks?

Plastic tank radiators (OEM-style) are typically less expensive and perform adequately for standard applications. However, all-aluminum radiators offer superior heat dissipation, longer lifespan (typically 10-15 years vs. 5-8 years), and better resistance to pressure cycles. For heavy-duty applications, frequent towing, or hot climate operation, aluminum radiators are worth the extra investment. They also eliminate the risk of plastic tank separation, a common failure point in older units.

Do I need to replace other cooling system components when installing a new radiator?

Yes, we strongly recommend replacing the thermostat, upper and lower radiator hoses, and hose clamps during radiator installation. These components are relatively inexpensive but critical for proper cooling system function. Additionally, flush the cooling system thoroughly to remove debris that could damage your new radiator. Many customers also replace the radiator cap and overflow tank if they show signs of wear or are over 5 years old.

How difficult is the installation process, and what special tools are required?

Installation typically takes 2-4 hours for experienced mechanics and 4-6 hours for DIY customers. You'll need basic hand tools, drain pans for coolant collection, and possibly a trim removal tool for grille components. The most challenging aspects are accessing lower mounting bolts and properly routing transmission cooler lines (if equipped). Some 2008+ models require removing the charge air cooler for access. Always support the radiator during installation to prevent damage to mounting tabs.

Why are some radiators significantly cheaper than others for the same truck model?

Price differences reflect core construction quality, warranty coverage, and manufacturing standards. Budget radiators often use thinner aluminum (1.0mm vs. 1.5mm), fewer cooling fins per inch, and lighter-duty welding. Premium radiators feature reinforced mounting brackets, better fin density (14-16 fins per inch vs. 10-12), and robust TIG welding. For commercial use or trucks exceeding 250,000 miles, investing in a premium radiator typically pays off through extended service life and better cooling performance under load.