Heavy Duty Coolant Reservoir Tank Compatible with 2008-2017

Our review of the Heavy Duty Coolant Reservoir Tank finds it best suited for owners and technicians who need a direct replacement reservoir that fits several Freightliner models without modification. The single biggest reason to consider this tank is its straightforward fitment: OE numbers A0525263005 / A0525263007 and replacement part 603-5203 match multiple Cascadia, Columbia and Century fronts so installation requires no drilling or cutting. The package also includes caps and a sensor, making it a near drop-in replacement for routine cooling system repairs.

Key Features

• OE Compatibility: Built to match OE numbers A0525263005 and A0525263007 so it aligns with factory mounting points for a direct fit.
• Replace Part Number: Designed to replace part number 603-5203 which simplifies ordering and confirms it targets the correct assemblies.
• Easy Installation: No drilling or cutting required, which saves shop time and reduces the risk of improper installation.
• Complete Package: Ships with the coolant reservoir, two caps and one sensor so you have the basic hardware needed to restore the recovery system.
• Fitment Range: Compatible with a wide range of Freightliner models from 2008 to 2017, providing flexibility for fleet repairs.

Who It's For

This reservoir is aimed at fleet maintenance technicians, owner-operators and DIY mechanics who need a reliable, like-for-like replacement for Freightliner Cascadia, Columbia and Century front models. If you require a part that installs quickly and restores the cooling recovery system without custom work, this is a sensible option.

Those who should look elsewhere include owners who expect a long-term upgrade in material durability or enhanced sensor electronics beyond the supplied unit. Several users noted issues with cracking and mixed sensor performance, so if extreme longevity or premium plastics are a priority, consider sourcing an upgraded OEM or heavy-duty aftermarket variant.

Pros & Cons

Pros

• Good fit and compatibility across multiple Freightliner model years, reducing fitment guesswork.
• Includes caps and a sensor so the installation is nearly complete out of the box.
• Easy to install with no cutting or drilling, saving time and avoiding modification.

Cons

• Some users report cracking of the plastic within weeks, so long-term durability can be inconsistent.
• Sensor quality is mixed in customer feedback, so the supplied sensor may not match OEM longevity.

Specifications

Brand	LOSTAR
OE Numbers	A0525263005, A0525263007, A05-25263-006
Replacement Part	603-5203
Fitment	Freightliner Cascadia, Columbia, Century models 2008-2017
Package Included	1pc coolant reservoir, 2pcs caps, 1pc sensor
Installation	No drilling or cutting required
Warranty	1 year unlimited-mileage quality guarantee

Our Verdict

The Heavy Duty Coolant Reservoir Tank is a pragmatic replacement for technicians and owners needing a direct-fit, easy-to-install recovery tank for many Freightliner models. It offers value through correct OE references and included caps and sensor, but potential buyers should weigh reports of inconsistent plastic durability and sensor performance when planning long-term repairs.

Frequently Asked Questions

Does this reservoir fit my Freightliner Cascadia?
It is compatible with multiple Cascadia model years including 2008-2014 variants listed by OE numbers and replacement part 603-5203.

Is drilling required to install this tank?
No, the tank is designed for direct replacement and does not require drilling or cutting to install.

What comes in the package?
The package includes one coolant reservoir, two caps and one sensor, plus a 1 year unlimited-mileage quality guarantee.