Frequently Asked Questions About Peterbilt 567/579 Coolant Reservoirs

What years and models are these coolant reservoirs compatible with?

Our coolant reservoirs are designed specifically for Peterbilt 567 and 579 models from 2013 to current production years. However, there are variations based on engine type and configuration. For PACCAR MX engines, the reservoir design differs from Cummins ISX applications. Always verify your engine model and year before ordering, as mounting brackets and hose connections can vary between early and late production runs.

Are these reservoirs made from the same material as OEM parts?

Most aftermarket coolant reservoirs are manufactured from high-density polyethylene (HDPE) plastic, matching OEM specifications for heat resistance and durability. The material is rated to withstand temperatures up to 250?F and pressure up to 20 PSI. Some premium options feature reinforced neck areas and thicker walls around mounting points to prevent stress cracks that commonly develop in original equipment after 150,000-200,000 miles.

How difficult is the installation process and what tools are required?

Installation typically takes 30-45 minutes and requires basic hand tools including a socket set, pliers for hose clamps, and a drain pan. The main challenges involve accessing the lower mounting bolts and properly bleeding air from the cooling system after installation. Most reservoirs come with new caps but reuse existing mounting hardware. You'll need to drain approximately 2-3 gallons of coolant, so have replacement coolant ready.

What's the difference between standard and surge tank style reservoirs?

Standard reservoirs function as overflow tanks with a single chamber design, while surge tanks feature a pressurized system with internal baffles to prevent coolant aeration. Surge tanks are typically found on 2016 and newer models with emission-compliant engines. The surge tank style includes a pressure relief valve integrated into the cap and requires specific pressure testing during installation to ensure proper system operation.

How can I tell if my coolant reservoir needs replacement?

Common failure indicators include visible cracks around the neck or mounting tabs, persistent coolant odor in the cab, white residue around seams indicating slow leaks, and coolant level dropping without visible external leaks. Additionally, if the reservoir appears swollen or distorted, or if the cap won't maintain proper pressure (typically 15-16 PSI), replacement is necessary to prevent engine overheating or coolant system damage.