Frequently Asked Questions About Peterbilt 359 Charge Air Coolers
What years and models of Peterbilt 359 are these charge air coolers compatible with?
Our charge air coolers are designed to fit Peterbilt 359 models from 1967 through 1987. However, compatibility can vary based on your specific engine configuration. Most units work with CAT 3406, Cummins Big Cam, and Detroit Diesel engines. We recommend checking your existing cooler's measurements or contacting us with your OEM and engine model to ensure proper fitment.
What's the difference between aluminum and copper/brass charge air coolers?
Aluminum charge air coolers are lighter weight (typically 40-50% lighter) and offer better heat dissipation, making them ideal for high-performance applications. Copper/brass units are more durable against road debris and easier to repair locally, but they're heavier and slightly less efficient. Most modern replacements are aluminum due to improved cooling capacity and fuel efficiency benefits.
How difficult is it to install a charge air cooler, and what tools do I need?
Installation typically takes 3-4 hours for experienced mechanics and 5-6 hours for DIY installers. You'll need basic hand tools, including socket sets, screwdrivers, and pliers. The most challenging parts are removing the grille assembly and properly aligning the mounting brackets. Many customers report needing to slightly modify mounting brackets on aftermarket units. We recommend having new clamps and silicone hoses on hand as the old ones often need replacement.
How do I know if my charge air cooler needs replacement versus cleaning?
Signs you need a replacement include visible cracks, bent fins covering more than 25% of the surface, internal leaks (oil in the cooler or loss of boost pressure), or temperature readings 20-30 degrees higher than normal. If your fins are just dirty or slightly bent, professional cleaning and fin straightening might restore performance. A pressure test at 30-35 PSI can help determine if internal leaks are present.
What size charge air cooler do I need, and will a bigger one improve performance?
Stock Peterbilt 359 charge air coolers typically measure 24" x 24" or 30" x 30", depending on your engine and model year. While larger coolers can reduce intake temperatures by 10-15 degrees, they require hood and mounting modifications. Most drivers see the best results staying with OEM dimensions unless doing significant engine modifications. Oversizing without proper airflow management can actually reduce cooling efficiency.
