One Stop Solutions 1791 Radiator

Radiator for OE-Style Cooling Performance

The One Stop Solutions 1791 radiator is built for direct replacement service on select Chevrolet and GMC trucks and SUVs from 1996-1999. It uses a crossflow design with a plastic tank construction and a premium aluminum core to support dependable engine cooling and transmission fluid temperature control.

Engineered for 1996-1999 Chevrolet C1500, K1500, C2500, and K2500 as well as GMC C1500, K1500, C2500, and K2500 applications, this radiator is designed around OE form and function for a clean, factory-style fit.

• Crossflow radiator design for OE-style replacement fitment
• Premium aluminum core with plastic tanks
• Transmission oil cooler included; engine oil cooler not included
• Single-row core construction with 28 1/4 in. core height and 17 1/4 in. core width
• Inlet diameter: 1 5/16 in.; outlet diameter: 1 9/16 in.
• Die-cut gasket design to help maintain a leak-resistant seal
• Individually pressure tested during production
• Built with factory-spec fitted and torqued components

Detailed Product Overview

One Stop Solutions part number 1791 is a replacement radiator engineered to match original equipment cooling layout and installation requirements. The unit measures 28 1/4 inches in core height, 17 1/4 inches in core width, and 1 inch in core thickness, with 18 3/4-inch inlet and outlet header lengths. It includes a plated transmission oil cooler with 11 1/2 inches between fittings, making it a direct-service solution for trucks that were originally equipped with transmission cooling in the radiator.

This radiator is a practical choice for Chevrolet C1500 radiator replacement, GMC K1500 radiator replacement, and other listed applications where OE-style cooling performance and fit are required. Part number 1791 is also cross-referenced to Spectra Premium CU1791 for the same application.

Common Problems This Radiator Can Address

• Overheating caused by a worn or restricted radiator core
• Transmission fluid temperature concerns related to a failing internal cooler
• Coolant leaks from aged tanks, seams, or gasket surfaces
• Reduced cooling efficiency from damaged fins or internal buildup
• Fitment issues from non-OE-style replacement parts

Installation Notes and Tips

Verify that the vehicle is equipped without an engine oil cooler, as noted in the fitment data. Confirm inlet and outlet hose sizes, header dimensions, and transmission cooler line routing before installation. Because this radiator is built for multi-fit coverage within the listed applications, compare the original unit to the new radiator before final mounting.

For best results, flush the cooling system, inspect hoses and clamps, and check the condition of the thermostat and radiator cap during service. Part number 1791 is designed for a direct replacement-style installation on the listed Chevrolet and GMC models.

Quality Assurance

OSC radiators are produced with premium-grade components and are individually pressure tested during manufacturing. The design process includes testing of the cooler circuits before tank installation, testing of the core before assembly, and a final test after assembly to confirm sealing and function.