One Stop Solutions 1690 Radiator

Radiator for Chevrolet and GMC Trucks

Restore cooling performance with this OSC Premium New Automotive Radiator, part number 1690. It is built for OE-style form and function with a premium aluminum core, plastic tanks, and a crossflow design for select Chevrolet C1500, K1500, C2500, K2500, C3500, K3500 and GMC C1500, K1500, C2500, K2500, C3500, K3500 applications.

Designed for 1988-1999 Chevrolet and GMC truck fitments, part number 1690 is a direct replacement radiator for vehicles equipped without an engine oil cooler and with a 28 1/4-inch core. It also serves 1993 Chevrolet and GMC Suburban models listed below.

Key Features

• Premium-grade aluminum core with plastic tanks
• Crossflow radiator design with one-row core construction
• Transmission oil cooler included with plated cooler type
• Die-cut gasket construction for leak resistance
• Individually pressure tested during production
• Factory-style fitment with OE form and function
• Engineered for improved cooling and longer service life
• Includes necessary fittings or hardware for installation

Detailed Description

OSC part number 1690 is engineered as an OE-style replacement radiator for full-size Chevrolet and GMC trucks and Suburban models. The radiator uses premium aluminum tubes and fins, plastic tanks, and cadmium-plated internal and external tube surfaces to help resist premature failure. Core dimensions measure 28 1/4 inches high by 17 1/4 inches wide with a 1-inch core thickness, and the unit uses a crossflow layout with 1 5/16-inch inlet and 1 9/16-inch outlet connections.

This radiator includes a transmission oil cooler and is built for applications without an engine oil cooler. It is a practical replacement for Chevrolet C1500, K1500, C2500, K2500, C3500, K3500 and GMC C1500, K1500, C2500, K2500, C3500, K3500 trucks, as well as 1993 Chevrolet and GMC C1500 Suburban, C2500 Suburban, K1500 Suburban, K2500 Suburban, and related listings. If you are searching for a radiator for a 1988-1999 Chevrolet C1500 or a 1988-1999 GMC K1500, part number 1690 matches the listed OE-style application.

This part cross-references APDI 8010618 and Spectra Premium CU618 for the same application.

Common Problems This Radiator Can Address

• Overheating caused by a worn or restricted radiator core
• Coolant leaks from aging tanks, seams, or gasket surfaces
• Reduced heat transfer from damaged fins or internal tube wear
• Transmission temperature concerns tied to a failing cooler circuit
• Fitment issues from a radiator that no longer matches OE dimensions

Installation Notes and Tips

Verify that your vehicle matches the listed 28 1/4-inch core application and the notes for use without an engine oil cooler before installation. Confirm inlet and outlet sizes, cooler line routing, and mounting points against the original radiator. This radiator is designed for drop-in fit, form, and function on the listed Chevrolet and GMC applications, including 1988-1999 Chevrolet C1500 and GMC K1500 trucks.

Before filling with coolant, inspect hoses, clamps, and transmission cooler lines for wear or contamination. Flush the cooling system if the previous radiator failed from corrosion, debris, or overheating.

Quality Assurance

OSC tests the radiator core before assembly, then tests the completed unit again during production. The transmission and engine oil cooler circuits are also checked prior to installation into the tank, and the finished radiator is pressure tested to help confirm sealing and performance. Part number 1690 is built to OE-style cooler design standards for the listed Chevrolet and GMC truck and Suburban applications.