AA Ignition Engine Coolant Reservoir for Freightliner Cascadia, Century Class — Direct-Fit, Lifetime Warranty

AA Ignition's Engine Coolant Reservoir is a direct-fit replacement overflow tank engineered to restore proper coolant circulation and pressure control in compatible Freightliner trucks.

This replacement coolant reservoir tank fits many Freightliner models and replaces part number 525263005 (and compatible OEM numbers). It captures expanding coolant from the radiator when the engine heats up and returns it when the system cools, preventing air entry, reducing fluid loss, and helping the cooling system run as designed. The tank is a non-OEM direct replacement, finished to match factory fit and function, and backed by a lifetime warranty.

How will this reservoir tank fix coolant leaks or low coolant level warnings?

Leaking or cracked overflow tanks are a common cause of coolant loss and low-level warnings. Replacing a damaged reservoir restores the sealed path between radiator and tank so coolant returns correctly and prevents external leaks.

• Direct-fit design for correct mounting and hose alignment.
• Durable molded plastic resists engine-bay heat and vibration.
• Proper inlet/outlet locations to re-establish closed cooling circulation.
• Lifetime warranty covers premature part failure.

Which Freightliner models and years are compatible with this coolant overflow tank?

This tank covers a wide range of Freightliner vehicles built across the late 2000s and 2010s. Check your truck’s part number or compare mounting points to confirm fit before installing.

• Covers Cascadia model years 2008–2019 and Century Class (2008–2011).
• Fits Columbia (2010–2015), Coronado (2010–2019) and FLD120SD (2011).
• Also compatible with M2 106 (2014, 2016) and M2 112 (2008–2019).
• Replaces OEM numbers including A05-25263-006, A0525263005 and 525263005.

Is this an original OEM part and how is the quality guaranteed?

This tank is an aftermarket direct replacement, not a factory-branded OEM unit. It is produced to match the factory shape and mounting points so installation is straightforward and the tank performs like the original.

• Form, fit, and function mirror the factory reservoir for seamless swap-in.
• Manufactured to withstand typical under-hood temperatures and pressures.
• Comes with a lifetime warranty to protect against defects and failures.
• Installation instructions and vehicle compatibility should be verified before purchase.

What should I know before replacing the coolant reservoir myself?

Replacing the reservoir is a straightforward repair but requires safety precautions and basic tools. Always allow the engine to cool fully before opening the cooling system to avoid scalding from pressurized hot coolant.

• Wait until the engine is cold; relieve system pressure before removing caps.
• Drain or catch coolant as needed and inspect hoses and clamps for wear.
• Transfer level markings and bleed any trapped air after installation.
• Dispose or recycle old coolant according to local regulations.

Who is this replacement reservoir for? If you own or maintain Freightliner Cascadia, Century Class, Columbia, Coronado, FLD120SD, M2 106 or M2 112 trucks and you see coolant leaks, recurring low-coolant alerts, or visible cracks in the overflow tank, this AA Ignition coolant reservoir is designed for you. It suits fleet managers, owner-operators, and DIY technicians looking to restore reliable cooling performance without dealer prices. Verify compatibility with your vehicle’s year and part number, follow safe service steps, and contact AA Ignition’s support for warranty help if the part fails.