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Wehrli gloss white L5P auxiliary coolant tank kit
Wehrli L5P fuel-cooler tank cap hose and hardware
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Wehrli L5P Auxiliary Fuel-Coolant Tank for 2020-2026 GM HD

$ 249.00 $ 241.53
$ 241.53

Replace the aging clear fuel-cooler reservoir with fabricated aluminum

The Wehrli WCF100224-GW is built for the verified application below and gives buyers a clearly defined configuration, finish, and installation scope before ordering.

Key Features

  • Fabricated aluminum auxiliary coolant tank for the L5P fuel-cooler circuit
  • Gloss white powder-coated finish with a black anodized billet aluminum cap
  • Uses the factory mounting location without requiring truck modifications
  • Overflow fitting, preformed hose, and mounting hardware are supplied
  • Replaces GM reservoir part number 84211275
  • Made in the USA
  • The exact configuration in this listing is identified by WCF100224-GW

Fitment

Years Make Model Required configuration
2020 - 2026 Chevrolet Silverado 2500 HD Wehrli WCF100224-GW, gloss white auxiliary coolant tank for the fuel-cooling circuit; factory 6.6L L5P Duramax diesel only. Requires the original GM 84211275 reservoir location and OEM mounting points. Not the main engine coolant expansion/surge tank, a gasoline L8T application, or a generic 6.6L-engine fit. Confirm the actual reservoir and hose interfaces before ordering.
2020 - 2026 Chevrolet Silverado 3500 HD Wehrli WCF100224-GW, gloss white auxiliary coolant tank for the fuel-cooling circuit; factory 6.6L L5P Duramax diesel only. Requires the original GM 84211275 reservoir location and OEM mounting points. Not the main engine coolant expansion/surge tank, a gasoline L8T application, or a generic 6.6L-engine fit. Confirm the actual reservoir and hose interfaces before ordering.
2020 - 2026 GMC Sierra 2500 HD Wehrli WCF100224-GW, gloss white auxiliary coolant tank for the fuel-cooling circuit; factory 6.6L L5P Duramax diesel only. Requires the original GM 84211275 reservoir location and OEM mounting points. Not the main engine coolant expansion/surge tank, a gasoline L8T application, or a generic 6.6L-engine fit. Confirm the actual reservoir and hose interfaces before ordering.
2020 - 2026 GMC Sierra 3500 HD Wehrli WCF100224-GW, gloss white auxiliary coolant tank for the fuel-cooling circuit; factory 6.6L L5P Duramax diesel only. Requires the original GM 84211275 reservoir location and OEM mounting points. Not the main engine coolant expansion/surge tank, a gasoline L8T application, or a generic 6.6L-engine fit. Confirm the actual reservoir and hose interfaces before ordering.

2020-2026 Chevrolet Silverado 2500 HD and 3500 HD and GMC Sierra 2500 HD and 3500 HD equipped with the 6.6L L5P Duramax. This auxiliary tank serves the fuel-cooler circuit and replaces GM 84211275 at the factory mounting location.

Specifications

Detail Value
Manufacturer Part Number WCF100224-GW
Application 2020-2026 GM HD trucks with the 6.6L L5P Duramax
Tank Function Auxiliary coolant reservoir for the fuel cooler
Material Fabricated aluminum
Finish Gloss white powder coat
Cap Black anodized billet aluminum
Mounting OEM location and mounting points
Replaces GM 84211275
Manufacturer Availability Gloss white listed in stock with a stated 3-5 business-day lead time

What's Included

  • Fabricated gloss white auxiliary coolant tank
  • Black anodized billet aluminum cap
  • Overflow fitting and preformed hose
  • Mounting hardware
  • Package identity is WCF100224-GW

About Wehrli

Wehrli Custom Fabrication designs and manufactures diesel-truck cooling, engine-bay, chassis, and exterior components in the United States, with application and configuration details published for each part.

Related Parts

  • Vehicle-specified coolant for the auxiliary fuel-cooler circuit
  • Replacement hoses or clamps only when inspection shows service is needed
  • Wehrli billet caps and engine-bay components matched to the same truck and finish

FAQ

What is the WCF100224-GW?

L5P Auxiliary Coolant Tank Kit is the exact Wehrli product described in this listing.

Does this replace the engine coolant surge tank?

No. It replaces the auxiliary reservoir used by the L5P fuel-cooler circuit.

Will it mount in the factory location?

Yes. Wehrli specifies the OEM mounting location and mounting points for the listed trucks.

Is this the gloss white version?

Yes. This listing is for the gloss white powder-coated configuration shown in the retained product images.

Does the truck need modifications?

Wehrli states that it fits a stock truck without other modifications.

What GM reservoir does it replace?

The manufacturer identifies GM part number 84211275 as the reservoir replaced by this kit.

Is a cap included?

Yes. A black anodized billet aluminum cap is included.

Are the hose and hardware included?

Yes. The manufacturer lists a preformed hose, overflow fitting, and mounting hardware.

Installation Instructions

  1. Confirm the package label shows WCF100224-GW and that the truck matches the fitment table.
  2. Read the current Wehrli and vehicle service instructions before disassembly.
  3. Allow sealant or bonded fittings to cure for at least 24 hours when required by the current Wehrli instructions before filling the system.
  4. Use the correct coolant and bleed the auxiliary circuit according to the vehicle service procedure.
  5. Reinspect the completed installation before road use and after the initial service interval.

California Proposition 65 Warning: Cancer and reproductive harm. See www.P65Warnings.ca.gov.

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