One Stop Solutions 1689 Radiator

Radiator for Chevrolet and GMC Trucks

OSC Premium New Automotive Radiator Part Number 1689 is built for OE-style form and function in compatible Chevrolet and GMC truck applications. It uses premium-grade aluminum construction with plastic tanks, integrated engine oil cooler and transmission oil cooler provisions, and a crossflow design to support consistent cooling performance.

Fits 1988-1995 Chevrolet C1500, N/A; Fits 1988-1995 Chevrolet C2500, N/A; Fits 1988-1995 Chevrolet K1500, N/A; Fits 1988-1995 Chevrolet K2500, N/A; Fits 1988-1995 GMC C1500, N/A; Fits 1988-1995 GMC C2500, N/A; Fits 1988-1995 GMC K1500, N/A; Fits 1988-1995 GMC K2500, N/A; Fits 1988-1994 Chevrolet C3500, N/A; Fits 1988-1994 Chevrolet K3500, N/A; Fits 1988-1994 GMC C3500, N/A; Fits 1988-1994 GMC K3500, N/A; Fits 1992-1993 Chevrolet C1500 Suburban, N/A; Fits 1992-1993 Chevrolet C2500 Suburban, N/A; Fits 1992-1993 Chevrolet K1500 Suburban, N/A; Fits 1992-1993 Chevrolet K2500 Suburban, N/A; Fits 1992-1993 GMC C1500 Suburban, N/A; Fits 1992-1993 GMC C2500 Suburban, N/A; Fits 1992-1993 GMC K1500 Suburban, N/A; Fits 1992-1993 GMC K2500 Suburban, N/A.

Key Features

• Part Number 1689 radiator for Chevrolet C1500, C2500, K1500, K2500, C3500, K3500 and GMC truck applications
• Crossflow radiator design with a 28 1/4 inch core height, 17 1/4 inch core width, and 1 inch core thickness
• Premium aluminum core with plastic tanks for OE-style fit and cooling performance
• Engine oil cooler included and transmission oil cooler included
• Plated cooler construction with 11 1/2 inch fitting spacing
• Die-cut gasket design to help maintain a leak-resistant seal
• Individually pressure tested during production
• Multi-fit engineering with factory-style fit and finish

Detailed Description

OSC 1689 is a replacement radiator engineered for direct-fit service in 1988-1995 Chevrolet and GMC C/K trucks and 1992-1993 Suburban models listed above. The radiator measures 28 1/4 inches in core height and 17 1/4 inches in core width, with a 1 inch core thickness, and uses a crossflow layout with 1 5/16 inch inlet and 1 9/16 inch outlet connections. This configuration supports OE-style cooling system service on high-mileage trucks where stable operating temperature matters.

The unit includes plated engine and transmission oil cooler sections, with cooler fitting spacing of 11 1/2 inches, and is built with premium-grade components selected for durability. OSC also tests the cooler sections before tank installation, checks the core before assembly, and pressure tests the completed radiator again after assembly. This makes Part Number 1689 a practical replacement for Chevrolet C1500 and GMC K2500 owners looking for a radiator that matches factory-style dimensions and cooling layout.

This part cross-references Spectra Premium CU622 and Four Seasons 20768 for the same application.

Common Problems This Radiator Can Address

• Coolant leaks from an aging radiator core or tank seam
• Overheating caused by restricted or weakened radiator cooling capacity
• Transmission fluid temperature concerns when the cooler circuit is worn
• Engine oil cooling issues on vehicles equipped with an oil cooler radiator
• Fitment problems from a damaged or incorrect replacement radiator

Installation Notes and Tips

Verify radiator dimensions, inlet and outlet sizes, and cooler line spacing before installation. This radiator is specified for vehicles with engine oil cooler equipment, so confirm the original cooling system configuration on the Chevrolet or GMC truck before ordering. Transfer any required fittings or hardware from the original setup only if they are not already present on the replacement unit and follow factory service procedures for coolant refill and system bleeding.

Quality Assurance

OSC builds this radiator to OE-style form and function using premium materials and production testing. Each unit is individually pressure tested, and the cooler circuits are checked during manufacturing to help confirm sealing and performance before installation.