One Stop Solutions 978 Radiator

Radiator for BMW 525i and 525iT

This OSC Premium radiator is built for 1990-1995 BMW 525i and 1993 BMW 525iT applications. Part number 978 is engineered for OES form and function, with a crossflow design and premium-grade aluminum construction for consistent cooling performance.

Key Features

• Fits 1990-1995 BMW 525i and 1993 BMW 525iT
• Crossflow radiator design
• Core dimensions: 20 3/8 in. height, 16 7/8 in. width, 1-1/4 in. thickness
• 1-row core construction
• Plastic tanks with PA core material
• 1 9/16 in. inlet and outlet diameters
• No engine oil cooler, transmission oil cooler, or cap included
• Part number 978

Detailed Description

OSC part number 978 is a direct-fit radiator for BMW 525i and BMW 525iT models listed in the fitment data. It uses a crossflow layout with a 20 3/8-inch core height, 16 7/8-inch core width, and 1-1/4-inch core thickness to match the original cooling package dimensions. The radiator is built with premium materials and factory-style mounting and header dimensions for a clean installation and proper fit in the engine bay.

The design focuses on stable coolant flow and long-term durability. OSC uses enhanced tube and fin construction, die-cut sealing surfaces, and pressure testing during production to help verify leak resistance and assembly integrity. This radiator is a practical OE-style replacement for a BMW 525i radiator or BMW 525iT radiator when the original unit is leaking, restricted, or no longer cooling effectively.

This part cross-references APDI 8010979 for the same application.

Common Problems This Radiator Can Address

• Coolant leaks from a cracked or aging radiator tank
• Overheating caused by reduced heat transfer
• Restricted coolant flow from internal buildup or core wear
• Temperature instability during stop-and-go driving
• Cooling system service needs on higher-mileage BMW 525i and 525iT vehicles

Installation Notes and Tips

Verify inlet and outlet sizing, header dimensions, and crossflow layout before installation. Inspect hoses, clamps, and adjacent cooling system components for wear before transferring the radiator into service. Confirm that the vehicle does not require an engine oil cooler or transmission oil cooler at the radiator before ordering, since this unit is listed without either cooler.

Quality Assurance

OSC states that each radiator is individually pressure tested during production, with additional testing performed on cooler circuits before and after assembly. The design also incorporates engineering updates aimed at improving durability and cooling performance in higher-mileage vehicles.