GM Genuine Parts Radiator
OE
Pack of 1

GM Genuine Parts Radiator

GM Part #89018318

ACDelco Part #21490

MSRP$697.02*

GM Genuine Parts Radiators are designed, engineered, and tested to rigorous standards, and are backed by General Motors.

  • Lightweight; the radiators have a positive heat transfer to weight ratio
  • Corrosion-resistant aluminum designed core helps optimize the radiators long lasting service life
  • Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE)

Pack of 1

About this product

GM Genuine Parts Radiators are designed, engineered, and tested to rigorous standards, and are backed by General Motors. Radiators are heat exchangers, typically located in the front of the vehicle where air can flow through the fins and dissipate heat. Modern radiators are made from aluminum and plastic, while older vehicles used copper and brass. These radiators are designed to be corrosion resistant with optimal heat transfer characteristics. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE).

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  • Lightweight; the radiators have a positive heat transfer to weight ratio
  • Corrosion-resistant aluminum designed core helps optimize the radiators long lasting service life
  • Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE)
  • GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors
  • GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle
  • GM regularly updates production and service part designs to integrate new materials and technologies

Mounting Hardware IncludedYes
Core MaterialAluminum
Mounting TypeBolt In
Core Row Quantity1
Core Thickness2.15 in / 54.5 mm
Core Width34 in / 863.6 mm
Core Height19.41 in / 493.1 mm
Transmission Oil Cooler Fitting Diameter0.67 in / 17 mm
ClassificationOE
Transmission Oil Cooler Distance between Fittings11.5 in / 292 mm
Tank MaterialPlastic
Outlet Header Width5.43 in / 138 mm
Transmission Oil Cooler Plate Quantity7
Transmission Oil Cooler TypePlate
Transmission Oil Cooler Fitting TypeQuick Connect
Transmission Oil Cooler IncludedYes
Outlet LocationBottom Right
Inlet LocationTop Left
Down Flow Or Cross Flow TypeCross Flow
Transmission Oil Cooler Fitting GenderFemale
Internal Engine Oil CoolerNo
Frame IncludedYes
Internal Transmission Oil CoolerYes
Radiator Cap IncludedNo
Inlet Diameter1.85 in / 46.92 mm
Outlet Diameter1.81 in / 46.89 mm
Transmission Oil Cooler Length12.95 in / 329 mm
Inlet Header Length20.63 in / 524 mm
Outlet Header Length20.63 in / 524 mm
Inlet Header Width5.63 in / 143 mm
Engine Oil Cooler IncludedNo

Limited Lifetime Warranty for Parts (plus Labor if installed by a GM dealer)

Please visit our warranty page on Gmparts.com for full warranty details.

Troubleshooting Tips:

  • Maintain proper coolant levels and check levels regularly. Also make sure to check coolants concentration because the water ratio can affect the freezing or boiling point. (Note: Never attempt to remove a surge or radiator cap while the engine is hot. Serious injury could result.)
  • Replace coolant with a mixture of antifreeze and water according to the owner's manual recommendations.
  • Evaluate radiator and radiator cap for leaks, corrosion, or worn cap gasket. Make sure to pressure test the cap.
  • Periodically, remove bugs, leaves, and other debris from the front of the radiator. They can block airflow and substantially reduce cooling efficiency.

ModelBody StyleTrimYear(s)
Sierra 2500 HD2001, 2002, 2003, 2004, 2005
Sierra 35002001, 2002, 2003, 2004, 2005

Frequently Asked Questions

No, an overheating engine could mean an issue with your radiator, but there are other pieces of the cooling system that could cause the engine to overheat. It is important to check for coolant leaks or a malfunctioning fan. If you look at the radiator and there is a lot of corrosion or holes there may be a problem with the radiator. Either way it is important to get the whole cooling system checked when your engine overheats.