One Stop Solutions 658 Radiator

Radiator for OE-Style Cooling Performance

This OSC Premium New Automotive Radiator is built for direct replacement service with OE form and function. Designed for select Chevrolet Lumina, Buick Regal, Oldsmobile Cutlass Supreme, and Pontiac Grand Prix applications, Part Number 658 focuses on fit, cooling efficiency, and leak resistance for everyday repair work.

Part Number 658 uses premium-grade aluminum construction with plated tubes and a die-cut gasket to help maintain sealing integrity. It is engineered for multi-fit applications without changing the original look or fit, and each unit is pressure tested during production.

Key Features

• OE-style radiator design for direct replacement service
• Premium-grade aluminum construction
• Plated tubes inside and out to help resist premature failure
• Die-cut gasket for improved sealing
• Factory-spec fitted and torqued components
• Drop-in fit, form, and function
• Transmission oil cooler type: plated
• Engine oil cooler type: none
• Cap not included

Detailed Description

OSC Part Number 658 is a replacement radiator engineered to match original equipment cooler design where originally equipped. It uses enhanced core and fin construction to support cooling performance and service life, with added durability features aimed at higher-mileage vehicles. This radiator is a practical choice for drivers and technicians servicing 1988-1992 Chevrolet Lumina, Buick Regal, Oldsmobile Cutlass Supreme, and Pontiac Grand Prix cooling systems.

This part cross-references Four Seasons 20373 for the same application.

What It Helps Address

• Overheating caused by a worn or restricted radiator
• Coolant leaks from aging tanks, seams, or gasket surfaces
• Reduced heat transfer from deteriorated core materials
• Transmission cooling concerns tied to a failing plated cooler circuit
• Fitment issues from a damaged or non-OE-style replacement radiator

Installation Notes and Fitment

Compatible with the following applications:

• Fits 1990-1992 Chevrolet Lumina, N/A, wo/COOLANT SENSOR
• Fits 1991 Buick Regal, N/A, w/TOC DRIVER SIDE
• Fits 1988-1991 Oldsmobile Cutlass Supreme, N/A
• Fits 1989-1990 Buick Regal, N/A
• Fits 1990 Chevrolet Lumina, N/A
• Fits 1988-1989 Pontiac Grand Prix, N/A, 1 3/8" Core
• Fits 1988 Buick Regal, N/A, 1 3/8" Core

Verify radiator dimensions, cooler routing, and sensor configuration before installation. This radiator is designed as a direct-fit replacement, and all necessary fittings or hardware are included in each unit.

Quality Assurance

Each radiator is individually pressure tested, with testing performed before cooler installation, after core testing, and again after final assembly. OSC also uses engineering updates such as increased fin density and thicker cores to address common failure points and improve durability in high-mileage service.