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.

Frequently Asked Questions About Peterbilt 379 Coolant Reservoirs

Will these coolant reservoirs fit my specific year Peterbilt 379?

Most aftermarket coolant reservoirs are designed to fit Peterbilt 379 models from 1987 to 2007. However, there are some variations between early models (1987-1999) and later models (2000-2007) due to mounting bracket differences. Always verify the product listing specifies compatibility with your exact model year. If you have a pre-2000 model, pay special attention to the mounting tab configuration as some reservoirs require minor modifications or adapter brackets.

What's the difference between plastic and aluminum coolant reservoirs?

Plastic reservoirs are typically OEM-style replacements that cost less and work well for standard applications. They usually last 5-7 years under normal conditions. Aluminum reservoirs offer superior durability, better heat dissipation, and won't crack from temperature extremes or age. While aluminum costs more upfront, many drivers consider it worthwhile for trucks that see heavy use or extreme temperatures. Aluminum reservoirs also add a custom appearance under the hood.

Do I need to replace any hoses or fittings when installing a new reservoir?

It's recommended to inspect and potentially replace the coolant hoses during reservoir installation. The lower radiator hose connection and overflow hose are particularly important to check for cracks or deterioration. Most reservoirs use standard 1.25-inch or 1.5-inch hose connections, but verify the inlet/outlet sizes match your existing setup. New hose clamps should always be used, and many drivers upgrade to constant-torque clamps for better long-term sealing.

Can I install a coolant reservoir myself, or do I need a mechanic?

Installation is generally straightforward and takes 30-60 minutes with basic tools. You'll need to drain the coolant system, remove the old reservoir (typically held by 2-4 bolts), transfer the coolant level sensor if equipped, and install the new unit. The main challenges are accessing tight mounting bolts and properly bleeding air from the system afterward. Having a second person helps when refilling to monitor for leaks. If you're comfortable with basic maintenance, this is a manageable DIY project.

Why are some coolant reservoirs significantly more expensive than others?

Price differences reflect material quality, manufacturing precision, and included features. Budget plastic reservoirs ($40-80) work but may have thinner walls and basic fittings. Mid-range options ($80-150) often include better plastics or entry-level aluminum construction. Premium reservoirs ($150-300+) feature thick-wall aluminum, polished or powder-coated finishes, upgraded fittings, and precise manufacturing tolerances. Consider your truck's use, climate conditions, and how long you plan to keep the vehicle when choosing between price points.