One Stop Solutions 1684 Radiator

OE-Style Radiator for Select GM Applications

One Stop Solutions Part Number 1684 is an OSC Premium New Automotive Radiator built for OES form and function. It uses premium-grade aluminum construction with plastic tanks, a crossflow layout, and an integrated plated transmission oil cooler to support stable engine temperatures in select Buick, Oldsmobile, and Pontiac applications.

Designed for direct replacement service, this radiator is engineered for a drop-in fit on vehicles such as the 1997-1999 Buick LeSabre, 1994-1999 Oldsmobile 88, and 1997-1999 Pontiac Bonneville. The 1684 radiator is also a fitment match for additional Oldsmobile and Buick applications listed below.

Key Features

• Premium aluminum core with plastic tanks
• Crossflow radiator design
• Integrated plated transmission oil cooler
• One-row core construction
• Die-cut gasket design for leak resistance
• Individually pressure tested during production
• Factory-style fit, form, and function
• Includes necessary fittings or hardware for installation

Detailed Product Overview

This OSC radiator is built to match original equipment cooler design where originally equipped, while adding engineering updates for durability and cooling consistency. Core dimensions measure 30 1/2 inches high by 17 1/4 inches wide with a 1-inch core thickness, and the unit uses 1 5/16-inch inlet and 1 9/16-inch outlet connections. The transmission oil cooler is plated, with an 11 1/2-inch distance between fittings.

Part Number 1684 is a practical replacement choice for drivers searching for a radiator for 1997-1999 Buick LeSabre, radiator for 1994-1999 Oldsmobile 88, or radiator for 1997-1999 Pontiac Bonneville. It is also listed for 1996 Buick LeSabre wo/EOC; wo/LCI, 1995-1996 Buick Park Avenue wo/EOC; wo/LCI, 1995-1996 Oldsmobile 98 wo/LCI, 1996 Pontiac Bonneville wo/EOC; wo/LCI, 1994 Oldsmobile 98 30 1/2" core; wo/LCI, and 1990-1992 Oldsmobile Toronado wo/LCI.

This part cross-references APDI 8011202 and Four Seasons 20691 for the same application.

Common Problems This Radiator Can Address

• Coolant leaks from a cracked or aging radiator tank
• Restricted cooling performance from a worn or clogged core
• Transmission heat buildup when the cooler circuit is failing
• Fitment issues caused by damaged mounting points or deteriorated seals
• Temperature instability in high-mileage Buick, Oldsmobile, and Pontiac vehicles

Installation Notes and Fitment Tips

Compatible with 1997-1999 Buick LeSabre, 1994-1999 Oldsmobile 88, 1996-1999 Oldsmobile LSS, 1997-1999 Pontiac Bonneville, 1997-1998 Oldsmobile Regency, 1996 Buick LeSabre wo/EOC; wo/LCI, 1995-1996 Buick Park Avenue wo/EOC; wo/LCI, 1995-1996 Oldsmobile 98 wo/LCI, 1996 Pontiac Bonneville wo/EOC; wo/LCI, 1994 Oldsmobile 98 30 1/2" core; wo/LCI, and 1990-1992 Oldsmobile Toronado wo/LCI. Verify core dimensions, inlet and outlet sizes, and cooler line routing before installation.

Factory-style components are fitted and torqued to specification during assembly, which helps support straightforward replacement on the listed applications. Confirm that the vehicle does not require an engine oil cooler, since this radiator is listed with no engine oil cooler included.

Quality Assurance

OSC tests the transmission and engine oil coolers before tank installation, checks the radiator core before assembly, and tests the completed unit again after assembly. The design also incorporates enhancements such as increased fin density and a thicker core to address common failure points in higher-mileage vehicles.