Coolant Reservoir / Surge Tank / with caps & sensors 575.1073BE or A0525263005

The rTech Black Label RT1073BE Coolant Reservoir is a heavy-duty replacement designed for compatible Freightliner and related commercial vehicle cooling systems.

Built from durable molded polymer, the RT1073BE provides the reservoir body, mounting layout, and hose connection points required for compatible installations while supporting normal coolant expansion and recovery within the cooling system.

This reservoir family is widely used across select Freightliner and Western Star applications and is designed for demanding commercial fleet service.

Built for uptime. Built for serious trucks.

Features & Benefits

• Heavy-duty molded polymer reservoir
• Designed for compatible Freightliner and related applications
• Vehicle-specific mounting layout
• Supports normal coolant expansion and recovery
• Durable construction for under-hood commercial vehicle environments
• Designed for straightforward replacement
• Fleet-approved Black Label quality 
  

rTech Product Specifications

• rTech Part Number: RT1073BE
• Product Type: Pressurized Coolant Reservoir / Surge Tank
• Material: Molded Polymer
• Installation: Vehicle-Specific
• Series: rTech Black Label 
  

If your actual RT1073BE assembly includes two caps and a sensor, we can add that once your supplier confirms those components are included in every unit.

Vehicle Applications

Designed as an aftermarket replacement for compatible Freightliner and related cooling-system applications.

Current application data for the 603-5203 / A0525263005 family includes select:

• Freightliner Cascadia
• Freightliner Century Class
• Freightliner Columbia
• Freightliner Coronado
• Freightliner M2 112
• Freightliner M2 106
• Western Star 5700XE 
  

Current catalogs also identify Automann 575.1073 / 575.1073BE within this family. 

Cooling-system configurations can vary by chassis, engine, model year, and reservoir assembly. Verify fitment by VIN before ordering.

Direct Cross References

• rTech Black Label: RT1073BE
• Automann: 575.1073BE
• Automann: 575.1073
• Freightliner: A0525263003
• Freightliner: A0525263005
• Freightliner: A0525263006
• Freightliner: A0525263007
• Freightliner: A0533118000
• Dorman: 603-5203
• Dorman: 6035203
• Newstar: S-22069
• Newstar: S-28934
• Sampa: 502.922
• World American: WA1950000
  

Dorman directly lists A0525263003, A0525263005, A0525263006, A0525263007, A0533118000, and 376793011 as OE crosses for 603-5203. 

Cross-reference numbers and manufacturer names are provided for identification and fitment purposes only. All trademarks are the property of their respective owners. rTech Black Label products are independent aftermarket replacement parts and are not manufactured, sponsored, endorsed, or approved by the referenced manufacturers. Always verify fitment before installation.

Why the Coolant Reservoir Matters

The coolant reservoir provides space for coolant expansion and recovery as engine temperature changes.

A cracked, damaged, or leaking reservoir can contribute to:

• Coolant loss
• Air entering the cooling system
• Reduced coolant reserve
• Cooling-system leaks
• Increased risk of overheating if coolant loss continues 
  

For commercial fleets, replacing a compromised reservoir before it causes a larger cooling-system issue can help prevent avoidable downtime.