A reliable coolant reservoir, also known as a radiator surge tank, is essential for keeping your Peterbilt truck's engine cool and running strong. If your coolant tank is leaking, cracked, or discolored, it's time for a replacement. Our aftermarket coolant reservoirs for semi trucks are built to meet or exceed OEM specs giving you the durability and performance your rig demands.

What Does a Semi Truck Coolant Reservoir (Surge Tank) Do?

Your surge tank plays a vital role in your engine's cooling system. It's not just a container it manages pressure, monitors coolant levels, and keeps your system functioning efficiently mile after mile. Here's how it works: - Manages Expansion & Contraction: As engine temps rise, coolant expands. The surge tank gives that coolant space to go preventing over-pressurization that can blow hoses or crack radiators. - Maintains System Pressure: A properly sealed coolant reservoir helps the system build and maintain pressure, which raises the boiling point and improves heat transfer. - Refills the Radiator Automatically: When the engine cools, the tank supplies coolant back to the semi-truck radiator with silicone radiator tubes keeping levels consistent and preventing air pockets. - Purges Air from the System: Most surge tanks are mounted at the highest point in the system to help vent trapped air for optimal cooling efficiency. - Shows Coolant Levels at a Glance: Clear plastic construction with visible level markings makes it easy to check coolant levels during pre-trip inspections. <3>Why Should You Replace Your Peterbilt 379 Coolant Reservoir? - Over time, coolant tanks can fail especially in heavy-duty trucks logging serious miles: - Cracks from heat, pressure, or vibration - Leaking fittings or caps that cause coolant loss - Sediment buildup or discoloration that makes inspections harder - Damaged caps that fail to regulate pressure A faulty coolant reservoir puts your entire engine at risk. Low coolant levels can lead to overheating, while pressure loss affects system efficiency. Replacing a failing surge tank protects the engine, improves fuel efficiency, and helps prevent breakdowns that cost time and money. Here are the benefits of getting a high-quality replacement coolant reservoir part. - Prevents Overheating: Protects against coolant loss and air pockets two major causes of engine overheating. - Extends Engine Life: Keeps temperatures stable and reduces stress on internal components. - Protects the Whole System: Helps prevent premature failure of hoses, water pumps, and radiators. - Simplifies Maintenance: Clear tanks with readable MIN and MAX levels make daily checks quick and easy. - Minimizes Downtime: Stay ahead of failures and avoid costly roadside repairs. Whether you're running a single classic Pete 379 or you're managing a fleet of late-model trucks, we carry aftermarket coolant reservoirs designed to fit a wide range of semi-truck makes and models. These tanks are engineered for long life, high heat resistance, and rock-solid durability. Consider adding a replacement radiator fan blade or shroud for efficient cooling. Shop replacement coolant reservoirs and surge tanks today and protect your truck from one of the most common causes of engine failure overheating. Stay cool, stay efficient, and keep those wheels turning.