One Stop Solutions 624 Radiator

Radiator for GM Trucks and SUVs

Restore cooling performance with this OSC Premium radiator, Part Number 624. Built for OES form and function, it is engineered for direct replacement service in a wide range of Chevrolet and GMC trucks and SUVs, including Silverado, C/K Series, Suburban, Blazer, Yukon, and Escalade applications.

• Crossflow radiator design with plastic tanks and a PA core
• 34-inch core height, 17 1/4-inch core width, and 2-3/16-inch core thickness
• Two-row core construction for efficient heat transfer
• Transmission oil cooler included with plated cooler design
• Engine oil cooler included with plated cooler design
• Premium-grade tubes, fins, headers, tanks, and related components
• Die-cut gasket construction for leak resistance
• Individually pressure tested during production

Built for OE-Style Cooling

OSC Part Number 624 is engineered to match original equipment form and function while addressing common failure points found in higher-mileage cooling systems. The radiator uses premium aluminum construction with cadmium-plated tubes inside and out to help resist premature failure, and the components are fitted and torqued to factory specifications. This radiator is a direct-fit solution for 1988-1999 Chevrolet C1500, K1500, C2500, K2500, C3500, K3500 and GMC C1500, K1500, C2500, K2500, C3500, K3500 models, plus related Silverado, Suburban, Blazer, Yukon, and Escalade applications listed in the fitment data.

This part cross-references Spectra Premium CU624 and Four Seasons 20353 for the same application.

Common Problems This Radiator Addresses

• Overheating from a restricted or leaking radiator core
• Transmission fluid temperature issues tied to a failing cooler circuit
• Engine oil cooling loss on vehicles equipped with an oil cooler
• Coolant leaks from aged tanks, seams, or gasket surfaces
• Reduced cooling efficiency in high-mileage GM trucks and SUVs

Installation Notes

Verify core dimensions, inlet and outlet sizes, and cooler line spacing before installation. This radiator is a crossflow design with 1 5/16-inch inlet and 1 9/16-inch outlet diameters, and the transmission oil cooler fitting spacing measures 8 1/2 inches. The unit is supplied without a cap. For best results, flush the cooling system, inspect hoses and mounts, and confirm all cooler connections are clean and secure before filling and bleeding the system.

Quality Assurance

OSC tests the transmission and engine oil coolers before they are installed into the tank, checks the radiator core before assembly, and tests the completed unit again after assembly. The design also incorporates enhancements for improved cooling and longer service life, including added fin density, thicker core construction, and larger transmission cooler capacity where needed.