LOSTAR Coolant Reservoir with Cap & Sensor for 2008–2017 Volvo & Mack Trucks — Direct-Fit, Pre-tested

If your heavy-duty Volvo or Mack truck shows low coolant levels, cracked reservoirs, or unreliable sensors, this direct-fit replacement tank from LOSTAR offers a ready-to-install solution. Engineered to match OE fitment and electrical connections listed under numbers like 21513979 and 21846997, the assembly arrives brand new and pre-tested to help you get back on the road quickly without custom modifications.

How does this reservoir match my truck’s original equipment?

The LOSTAR tank is manufactured to the same fit, mounting points, and sensor interfaces as the OEM unit so it installs using existing brackets and hoses. It lists cross-references to original part numbers and fits common chassis years and models used in long-haul fleets.

• Compatible with 2008–2017 Volvo VNL, VNM, VHD and Mack CXU, CHU, Pinnacle models
• OE cross-reference numbers: 21513979, 21846995, 21846997, 22061288
• Also referenced under aftermarket part numbers 603-5505 and 6035505
• No drilling or cutting required for typical installations

What do I need to know about installation and wiring?

Installation is straightforward: the tank mounts to the factory points, the sensor plugs into the original harness, and hoses attach to the factory outlets. Because it follows OE geometry, most technicians can complete the swap quickly using standard tools.

• Direct-fit mounting aligns with original brackets and bolt pattern
• Pre-installed cap and sensor reduce assembly time
• No special adapters, cutting, or drilling needed for compatible trucks
• Typical install time is comparable to replacing the original reservoir

Which materials and performance features should I expect?

The reservoir is built from durable, heat-resistant polymer designed for heavy trucking environments and repeated thermal cycling. It arrives brand new and backed by a 1-year limited warranty, offering peace of mind over used or refurbished parts.

• High-strength polymer resists cracking and leaks under vibration
• Integrated sensor port for reliable coolant-level monitoring
• Factory-style cap included to maintain proper pressure relief and sealing
• Backed by a 1-year limited warranty for manufacturing defects

How will this reservoir affect my cooling system’s reliability?

Replacing a degraded or leaking tank restores proper coolant containment and sensor feedback, reducing overheating risk associated with uncontrolled fluid loss. Using a correct-fit replacement ensures hoses and the sensor function as intended, supporting consistent engine temperature control.

• Prevents coolant loss from cracks or failing fittings
• Maintains accurate level sensing to trigger alerts when needed
• Helps preserve coolant circulation and engine thermal stability
• Reduces downtime caused by repeat temporary repairs

Who is this for: This LOSTAR coolant reservoir assembly is intended for fleet managers, diesel mechanics, and owner-operators running 2008–2017 Volvo VNL/VHD/VNM trucks or Mack CHU/CXU/Pinnacle models who need a direct-fit, OE-referenced replacement with sensor and cap included. It’s a practical choice when you want a brand-new tank that installs with factory connections and carries a one-year limited warranty to protect against manufacturing defects.

• Features: Compatible with 2008-2017 Volvo VNL, VNM, VHD and Mack CXU, CHU; OE numbers 21513979, 21846995, 21846997, 22061288; part numbers 603-5505 and 6035505; no drilling or cutting required; brand new; 1-year limited warranty