One Stop Solutions 1521 Radiator
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One Stop Solutions

One Stop Solutions 1521 Radiator

Brand One Stop Solutions 1521
Cap Included NO
Core Height 34 1/8
Core Material PA
Core Row Quantity 2
Core Thickness 2-3/16
Core Thickness 56
Core Width 19 7/16
Down Flow Or Cross Flow Type CROSSFLOW
Engine Oil Cooler Included YES
Engine Oil Cooler Type PLATED
Inlet Diameter 1 3/8
Inlet Header Length 20 11/16
Inlet Header Width 3 1/8
Oil Cooler Fittings Distance Apart 11 1/2
Outlet Diameter 1 9/16
Outlet Header Length 20 11/16
Outlet Header Width 3 1/8
Tank Material PLASTIC
Transmission Oil Cooler Distance between Fittings 11 1/2
Transmission Oil Cooler Included YES
Transmission Oil Cooler Type PLATED
Fits Chevrolet and GMC · 80 vehicles

O.E. form and function. Engineered as a direct-fit radiator with hassle-free installation.

Premium aluminum construction. Cadmium-plated tubes help resist premature failure and leaks.

Crossflow design. Built for efficient cooling with a 2-row core and integrated coolers.

Cross-references Dorman - HELP 20732, Spectra Premium CU1521 and 431342 for the same application. See all 4.

$289.55Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
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Step 2 — Quantity
Order total $289.55
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
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OE-Style Cooling Replacement

The One Stop Solutions 1521 radiator is built for direct replacement service on select Chevrolet and GMC trucks and SUVs from 1994-2000. It uses a crossflow design with a plastic tank and premium aluminum core construction to support stable engine and transmission cooling in demanding daily use.

Fits 1994-2000 Chevrolet C2500, N/A; Fits 1994-2000 Chevrolet C3500, N/A; Fits 1994-2000 Chevrolet K2500, N/A; Fits 1994-2000 Chevrolet K3500, N/A; Fits 1994-2000 GMC C2500, N/A; Fits 1994-2000 GMC C3500, N/A; Fits 1994-2000 GMC K2500, N/A; Fits 1994-2000 GMC K3500, N/A; Fits 1994-1999 Chevrolet C2500 Suburban, N/A; Fits 1994-1999 Chevrolet K2500 Suburban, N/A; Fits 1994-1999 GMC C2500 Suburban, N/A; Fits 1994-1999 GMC K2500 Suburban, N/A.

  • Core height: 34 1/8 in.
  • Core width: 19 7/16 in.
  • Core thickness: 2-3/16 in.
  • 2-row core construction
  • Crossflow radiator layout
  • Plastic tank material with PA core material
  • Transmission oil cooler included
  • Engine oil cooler included
  • Plated transmission and engine oil cooler design
  • Inlet diameter: 1 3/8 in.; outlet diameter: 1 9/16 in.

Built For Direct Replacement

OSC Premium New Automotive Radiator Part Number 1521 is engineered to match original equipment form and function while adding durability-focused updates. The radiator uses premium-grade aluminum tubes and cadmium-plated tubes inside and out to help resist premature failure, and the unit is individually pressure tested during production. OSC also uses a die-cut gasket to help maintain a leak-resistant seal and fits components to factory specifications for consistent installation on Chevrolet C2500, Chevrolet K2500, GMC C3500, and related applications.

This part cross-references Spectra Premium CU1521 and Dorman 20732 for the same application.

Common Replacement Reasons

  • Leaking radiator tanks or seams
  • Restricted cooling performance from an aging core
  • Transmission fluid temperature concerns tied to a worn cooler circuit
  • Engine oil cooler service needs on equipped vehicles
  • Fitment issues caused by a damaged or previously repaired radiator

Installation Notes

Verify radiator dimensions, inlet and outlet sizes, and cooler line spacing before installation. This radiator is a drop-in style replacement for listed Chevrolet and GMC applications, and all necessary fittings or hardware are included in each unit. Confirm that the vehicle uses the radiator with engine oil cooler and transmission oil cooler configuration noted in the fitment data.

Quality Assurance

OSC tests the transmission and engine oil coolers before they are installed into the tank, checks the radiator core prior to assembly, and tests the completed unit again after assembly. The design also incorporates added cooling capacity features for high-mileage vehicles, including increased fin density, thicker core construction, and larger transmission cooler capacity where applicable. Part number 1521 is built to OE-style cooling standards for the listed Chevrolet and GMC fitments.

Related reading

This part fits 80 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
YearMakeModelTransmissionLitersCylindersPositionNotes
2000ChevroletC2500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
2000ChevroletC3500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
2000ChevroletK2500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
2000ChevroletK3500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
2000GMCC2500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
2000GMCC3500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
2000GMCK2500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
2000GMCK3500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1999ChevroletC2500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1999ChevroletC2500 SuburbanAutomatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1999ChevroletC3500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1999ChevroletK2500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1999ChevroletK2500 SuburbanAutomatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1999ChevroletK3500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1999GMCC2500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1999GMCC2500 SuburbanAutomatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1999GMCC3500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1999GMCK2500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1999GMCK2500 SuburbanAutomatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1999GMCK3500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1998ChevroletC2500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1998ChevroletC2500 SuburbanAutomatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1998ChevroletC3500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1998ChevroletK2500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1998ChevroletK2500 SuburbanAutomatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1998ChevroletK3500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1998GMCC2500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1998GMCC2500 SuburbanAutomatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1998GMCC3500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1998GMCK2500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1998GMCK2500 SuburbanAutomatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1998GMCK3500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1997ChevroletC2500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1997ChevroletC2500 SuburbanAutomatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1997ChevroletC3500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1997ChevroletK2500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1997ChevroletK2500 SuburbanAutomatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1997ChevroletK3500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1997GMCC2500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1997GMCC2500 SuburbanAutomatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1997GMCC3500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1997GMCK2500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1997GMCK2500 SuburbanAutomatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1997GMCK3500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1996ChevroletC2500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1996ChevroletC2500 SuburbanAutomatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1996ChevroletC3500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1996ChevroletK2500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1996ChevroletK2500 SuburbanAutomatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1996ChevroletK3500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1996GMCC2500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1996GMCC2500 SuburbanAutomatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1996GMCC3500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1996GMCK2500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1996GMCK2500 SuburbanAutomatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1996GMCK3500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1995ChevroletC2500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1995ChevroletC2500 SuburbanAutomatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1995ChevroletC3500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1995ChevroletK2500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1995ChevroletK2500 SuburbanAutomatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1995ChevroletK3500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1995GMCC2500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1995GMCC2500 SuburbanAutomatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1995GMCC3500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1995GMCK2500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1995GMCK2500 SuburbanAutomatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1995GMCK3500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1994ChevroletC2500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1994ChevroletC2500 SuburbanAutomatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1994ChevroletC3500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1994ChevroletK2500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1994ChevroletK2500 SuburbanAutomatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1994ChevroletK3500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1994GMCC2500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1994GMCC2500 SuburbanAutomatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1994GMCC3500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1994GMCK2500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1994GMCK2500 SuburbanAutomatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
1994GMCK3500Automatic7.4LV8N/ARadiator with EOC, 1-1/4" core, and enhanced design
Directly replaces or cross-references 4 part numbers
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
Dorman - HELP — 20732Spectra Premium — CU15214313428011521