One Stop Solutions 1790 Radiator

Radiator for 1996-1999 Chevrolet C1500 and GMC K1500

Restore cooling performance with this OSC Premium radiator, part number 1790. Built for O.E. form and function, it is engineered for direct replacement service on select Chevrolet C1500, Chevrolet K1500, GMC C1500, GMC K1500, Chevrolet C2500, GMC C2500, and Chevrolet/GMC K2500 applications with engine oil cooler and transmission oil cooler provisions where equipped.

Key Features

• Premium aluminum core construction with plastic tanks
• Crossflow design with a 28 1/4 in. core height and 17 1/4 in. core width
• 1-row core layout for OE-style packaging
• Transmission oil cooler included; plated cooler design
• Engine oil cooler included; plated cooler design
• Die-cut gasket construction for leak resistance
• Individually pressure tested during production
• Drop-in fit for select GM truck cooling system layouts

Detailed Description

OSC part number 1790 is a replacement radiator engineered around original equipment dimensions and cooling requirements. The unit uses premium-grade aluminum components with cadmium-plated tubes inside and out to help resist premature failure, while the plastic tank design maintains OE-style fitment. Core dimensions measure 28 1/4 inches high by 17 1/4 inches wide, with 1-inch core thickness, 1 5/16-inch inlet diameter, and 1 9/16-inch outlet diameter. This radiator also includes plated engine and transmission oil coolers, making it a practical choice for trucks that rely on integrated cooling for both engine and transmission operation.

Compatible with 1996-1999 Chevrolet C1500, 1996-1999 Chevrolet K1500, 1996-1999 GMC C1500, 1996-1999 GMC K1500, 1996-1998 Chevrolet C2500, 1996-1998 GMC C2500, and 1998 Chevrolet K2500 / GMC K2500 applications listed with the matching 28 1/4 in. core configuration. This part cross-references Spectra Premium CU1790 for the same application.

What It Helps Address

• Overheating caused by a restricted or aging radiator core
• Coolant leaks from worn tanks, seams, or gasket surfaces
• Reduced heat transfer from damaged or corroded cooling passages
• Transmission temperature concerns on vehicles with integrated oil cooling
• Engine oil cooling issues on equipped GM truck applications

Installation Notes and Tips

Verify the core height, inlet and outlet sizes, and cooler layout before installation. This radiator is designed for crossflow applications with integrated oil cooler fittings spaced 11 1/2 inches apart. Transfer all vehicle-specific connections and confirm hose routing, fan clearance, and mounting points match the original unit before filling and bleeding the cooling system.

Quality Assurance

OSC tests the radiator core before assembly, then tests the completed unit again after assembly, with additional testing of the engine and transmission oil coolers prior to installation into the tank. The design also incorporates factory-spec fitted and torqued components and enhancements aimed at improving durability in higher-mileage vehicles.