Denso 221-9003 Radiator

Denso Radiator for OE-Style Cooling

The Denso 221-9003 radiator is built for direct replacement cooling performance in select Chevrolet, Buick, Oldsmobile, and Pontiac applications. It combines OE-style dimensions with an integrated transmission oil cooler to support stable engine temperature and dependable heat transfer.

Key Features

• Core height: 15.0780
• Core width: 30.5110
• Core thickness: 0.6290
• Inlet diameter: 1.3380
• Outlet diameter: 1.3380
• Transmission oil cooler included: yes
• Built to match OE radiator configuration, tank design, fin pitch, core dimensions, and materials
• Part number: 221-9003

Detailed Description

Denso 221-9003 is a radiator engineered to meet original equipment standards for fitment, cooling efficiency, and durability. Denso supplies radiators to OE vehicle manufacturers worldwide, and this radiator reflects that experience with a design focused on consistent engine cooling and reliable heat exchange. It is a strong match for drivers searching for a radiator for 1994-1997 Buick Regal, 1994-1997 Pontiac Grand Prix, 1994-1997 Oldsmobile Cutlass Supreme, or 1994-1997 Chevrolet Lumina and Monte Carlo applications without heavy duty cooling where noted. This part cross-references Spectra Premium CU1518 and ACDelco 20942 for the same application.

What This Radiator Helps Address

• Engine overheating caused by reduced coolant flow or heat rejection
• Cooling system inefficiency from a damaged or leaking radiator core
• Transmission temperature concerns when the factory cooler is part of the circuit
• Fitment issues from a radiator that does not match OE dimensions
• Cooling performance loss in daily driving or stop-and-go traffic

Installation Notes and Tips

Verify radiator dimensions, inlet and outlet size, and transmission cooler connections before installation. Confirm vehicle configuration against the listed fitment, including the note for Lumina and Monte Carlo models without heavy duty cooling. Flush the cooling system, inspect hoses and clamps, and refill with the correct coolant mixture after installation. The Denso 221-9003 is listed for 1994-1996 Buick Regal, 1994-1997 Chevrolet Lumina, 1995-1997 Chevrolet Monte Carlo, 1994-1997 Oldsmobile Cutlass Supreme, and 1994-1997 Pontiac Grand Prix applications.

Quality Assurance

Denso uses OE manufacturing experience and durability testing to support consistent radiator performance. Each radiator is evaluated for function and durability to help ensure dependable operation under demanding conditions.