Coolant Reservoir / Surge Tank / with caps & sensors 575.1043 or DR104004

The rTech Black Label RT1043 Coolant Reservoir is a heavy-duty replacement designed for compatible Kenworth and Peterbilt cooling-system applications.

Built from durable molded polymer, the RT1043 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 assembly is configured for the DR104004 / CP237001 reservoir family and is designed for demanding commercial truck service.

Built for uptime. Built for serious trucks.

Features & Benefits

• Heavy-duty molded polymer reservoir
• Designed for compatible Kenworth and Peterbilt applications
• Vehicle-specific mounting layout
• OE-style hose connection locations
• 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: RT1043
• Product Type: Coolant Reservoir / Surge Tank
• Material: Molded Polymer 
• Installation: Vehicle-Specific
• Series: rTech Black Label
  

Vehicle Applications

Designed as an aftermarket replacement for select Kenworth and Peterbilt cooling-system applications.

Current application and reference data associates the DR104004 / 575.1043 family with select:

• Kenworth T680
• Kenworth T880
• Peterbilt 579
  

Automann 575.1043 is catalogued for Kenworth T680/T880 and Peterbilt 579 applications. 

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

Direct Cross References

• rTech Black Label: RT1043
• Automann: 575.1043
• PACCAR: DR104004
• PACCAR: DR104002
• PACCAR: DR104003 
•  PACCAR: CP237001
• TRP: ST4004
• Reference: ST4002
• Reference: 29070289
• Dorman: 603-5570
  

DR104004 is documented as the current PACCAR surge-tank assembly number replacing DR104002, CP237001, and DR104003. Automann 575.1043 also cross-references to Dorman 603-5570.

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 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 damaged reservoir early can help prevent a much larger cooling-system problem.