Coolant Reservoir / Surge Tank / with caps & sensors 575.1026A or T1673008 (upper outlet)

The rTech Black Label RT1026A Coolant Reservoir is a heavy-duty replacement designed for compatible Kenworth and Peterbilt cooling-system applications.

Built from durable molded polymer, the RT1026A provides the mounting and hose connection layout required for compatible installations while supporting normal coolant expansion and recovery within the cooling system.

This version is configured with the upper outlet arrangement corresponding to the T1673008 / N5346001 reservoir family.

Built for uptime. Built for serious trucks.

Features & Benefits

• Heavy-duty molded polymer reservoir
• Upper-outlet configuration
• Designed for compatible Kenworth and Peterbilt applications
• Supports normal coolant expansion and recovery
• Vehicle-specific mounting layout
• Durable construction for commercial vehicle environments
• Designed for straightforward replacement
• Fleet-approved Black Label quality 
  

rTech Product Specifications

• rTech Part Number: RT1026A
• Product Type: Pressurized Coolant Reservoir / Surge Tank
• Configuration: Upper Outlet
• 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 catalogs associate the T1673008 / N5346001 / 603-5403 reservoir family with applications including:

• Kenworth T660
• Kenworth T800
• Kenworth W900
• Peterbilt 365
• Peterbilt 367
• Peterbilt 382
• Peterbilt 384
• Peterbilt 385
• Peterbilt 386
• Peterbilt 388
• Peterbilt 389
  

Fitment varies by year and cooling-system configuration. 

Verify fitment by VIN or existing reservoir number before ordering.

Direct Cross References

• rTech Black Label: RT1026A
• Paccar: T1673008
• Paccar: T1673009
• Paccar / Kenworth / Peterbilt: N5346001
• Dorman: 603-5403
• Dorman: 6035403
• Automann Reference Family: 575.1023
• Automann Reference Family: 575.1026
• Newstar: S-23610
• Paccar: ST6000
• Paccar: ST6001
• Paccar: ST6002
• PAI: 730432 
  

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 plays an important role in the cooling system by providing space for coolant expansion and recovery.

A damaged or leaking reservoir can contribute to:

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

Replacing a cracked or damaged reservoir with the correct application helps restore the integrity of the coolant storage and recovery system.

For commercial fleets, catching a reservoir problem early can help prevent a much more expensive cooling-system failure.