A properly functioning Peterbilt 379 charge air cooler (also known as an air to air cooler or intercooler) is critical for keeping your engine running strong, efficient, and cool under pressure. Once it's damaged, it can't be repaired, you'll need to replace the entire part. Thankfully, we carry a wide-assortment of high-quality, heavy-duty replacement charge air coolers that are built to deliver powerful results for your Peterbilt truck. What Does the Charge Air Cooler Do? In all turbocharged diesel engines, the turbo compresses incoming air, which naturally heats it up. Hot air carries less oxygen, which means weaker combustion. That's where the charge air cooler comes in it drops the temperature of that pressurized air before it hits the cylinders. Cooler air = denser air = more oxygen = more power, better fuel economy, and lower emissions. If your Peterbilt 379 intercooler isn t performing, you ll feel it in loss of power, poor mileage, and hotter engine temps. Key Benefits of a Replacement Charge Air Cooler with BESTfit Parts. - Restores Lost Power & Torque: a healthy CAC lets cooler, denser air reach your engine, giving you stronger combustion, better throttle response, and the muscle you need to pull uphill or carry heavy loads. - Improves Fuel Efficiency: complete combustion = less wasted fuel. With rising diesel costs, even a small boost in MPG can save thousands over the long haul. - Reduces Engine Stress & Temperatures: cooler intake air helps regulate internal engine temps. That means less wear and tear, fewer breakdowns, and longer engine life. - Lowers Emissions: better combustion helps cut back on black smoke and harmful exhaust keeping your truck compliant with emissions standards. - Protects Your Turbocharger: a properly functioning CAC helps reduce backpressure on your turbo. That means it runs cooler and lasts longer'saving you a costly replacement. Why Replace Your CAC? Even the toughest coolers wear out over time. Common issues include: - Cracked or damaged cores from road debris - Internal corrosion from moisture in the intake system - Oil residue and pressure loss from failed turbo seals - Whistling or hissing from leaking boots or cracked pipes - Loss of engine performance and poor fuel mileage If you're noticing black smoke, sluggish acceleration, or high intake temps your CAC may be the culprit. Built for Heavy-Duty Performance Our Peterbilt 379 replacement charge air coolers come in a range of sizes and configurations to match your specific year and engine setup. Whether you need a standard tube and fin cooler or a bar and plate design for extra durability, we ve got the right fit for your needs. - Designed for Peterbilt 357, 375, 377, 378, 379, 385 - Sizes from 25" x 27.25" up to 33.5" x 30.5" - Compatible with OE mounting and charge air cooler pipes - Perfect match for high-performance or high-mileage rebuilds - Pair your new CAC with reinforced CAC boots, clamps, and pipes for a complete system refresh that locks in boost and keeps your engine breathing easy. Power Your 379 Model with an Aftermarket CAC Upgrade. If you're running a Peterbilt 379 with a worn or leaking intercooler, you're leaving horsepower, fuel economy, and reliability on the table. That's just not good for business. Upgrading to a high-quality replacement charge air cooler restores that lost performance and gives you confidence on every haul. Browse our inventory of air to air cooler parts today and find the perfect fit for your rig. Better airflow starts here. Less heat. More power. No compromises.