Peterbilt 379 Coolant Reservoirs & Surge Tanks

Coolant is added through the surge tank or coolant reservoir mounted near the radiator, usually on the passenger side of the engine compartment. Locate the cap marked for coolant, ensure the engine is cool before opening, and fill to the indicated level line to avoid overfilling or air pockets.

A coolant reservoir is a simple overflow container that catches excess coolant expelled during heating, while a surge tank is a pressurized component integrated into the cooling system that also serves as the fill point and air separator, commonly used in Class 8 trucks like the Peterbilt 379 for improved efficiency.

Yes, quality aftermarket surge tanks are manufactured to OEM-equivalent specifications, matching original dimensions, mounting points, and material composition. This ensures proper fitment and performance without modifications, typically at a lower cost than genuine Peterbilt dealer parts.

Common signs include visible cracks, coolant leaks around the tank, discoloration from overheating, a loose or damaged cap, or frequent low coolant warnings. If your engine repeatedly overheats despite proper coolant levels, the surge tank may no longer be maintaining correct system pressure.

Most coolant reservoirs and surge tanks for the Peterbilt 379 are constructed from durable polypropylene plastic or aluminum, chosen for resistance to heat, pressure, and coolant chemical exposure. Aluminum tanks offer added durability for heavy-duty use, while plastic tanks provide a lightweight, cost-effective option.

Shipping times vary based on location and product availability, but in-stock coolant reservoirs and surge tanks typically ship within 1-3 business days. Contact our team at +1 877-615-3002 for specific lead times and expedited shipping options for your Peterbilt 379.