One Stop Solutions 677 Radiator

Radiator Overview

OSC Premium New Automotive Radiator 677 is built to OES form and function for trucks that need a direct-fit cooling replacement. It uses premium-grade aluminum construction with plastic tanks and a crossflow layout, and it is engineered for multi-fit applications without changing the original look or fit.

Fits 1988-1993 Chevrolet C1500, N/A with EOC; Fits 1988-1993 Chevrolet C2500, N/A with EOC; Fits 1988-1993 Chevrolet K1500, N/A with EOC; Fits 1988-1993 Chevrolet K2500, N/A with EOC; Fits 1988-1993 GMC C1500, N/A with EOC; Fits 1988-1993 GMC C2500, N/A with EOC; Fits 1988-1993 GMC K1500, N/A with EOC; Fits 1988-1993 GMC K2500, N/A with EOC.

Key Features

• Premium-grade aluminum core with plastic tanks.
• Crossflow design with one-row core construction.
• Transmission oil cooler and engine oil cooler included.
• Cadmium-plated tubes help resist premature failure.
• Individually pressure tested during production.
• Die-cut gasket helps maintain a leak-resistant seal.

Detailed Description

Part number 677 is engineered for Chevrolet C1500, Chevrolet K2500, and related GMC truck applications that use an engine oil cooler. The radiator measures 20 3/4 inches high, 17 1/4 inches wide, and 1 inch thick, with 1 5/16-inch inlet and 1 9/16-inch outlet connections. OSC also includes plated transmission and engine oil cooler circuits, matching the original cooler design where equipped.

This radiator cross-references APDI 8010677 and Spectra Premium CU677 for the same application. OSC states that the unit is tested during production and built with fitted components torqued to factory specifications for consistent assembly. Part number 677 is a practical replacement choice for owners maintaining cooling performance on Chevrolet C1500 and GMC K1500 trucks.

Common Problems It Can Address

• Coolant leaks from a worn radiator core or tank seal.
• Reduced cooling efficiency from aging internal passages.
• Transmission heat buildup in vehicles with an integrated cooler.
• Engine oil cooling loss where the original radiator included an oil cooler.
• Fitment issues caused by a damaged or non-OE-style replacement unit.

Installation Notes and Tips

Verify the existing radiator dimensions, inlet and outlet sizes, and cooler configuration before installation. This unit is intended for applications with EOC, so confirm the original vehicle setup matches the listed fitment. Part number 677 is supplied as a radiator assembly with the cooler circuits specified in the product data.

Quality Assurance

OSC Premium radiators are built to OES form and function and are individually pressure tested during production. The manufacturer also notes cadmium-plated tubes, a die-cut gasket, and factory-spec assembly practices to support consistent sealing and durability.