GM Genuine Parts Radiator
OE
Pack of 1

GM Genuine Parts Radiator

GM Part #42418327

ACDelco Part #21878

MSRP$363.84*

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).

Warning WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

  • 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 IncludedNo
Core Row Quantity1
Mounting TypePin
Core MaterialAluminum
Core Thickness0.79 in / 20 mm
Outlet Diameter1.34 in / 34.15 mm
ClassificationOE
Transmission Oil Cooler Distance between Fittings11.5 in / 292 mm
Core Width24.41 in / 620 mm
Inlet Diameter1.52 in / 38.5 mm
Core Height19.77 in / 502.09 mm
Tank MaterialPlastic
Outlet Header Width3.35 in / 85 mm
Transmission Oil Cooler Plate Quantity3
Down Flow Or Cross Flow TypeCross Flow
Frame IncludedYes
Internal Transmission Oil CoolerYes
Internal Engine Oil CoolerNo
Transmission Oil Cooler TypePlate
Transmission Oil Cooler Fitting TypeQuick Connect
Transmission Oil Cooler IncludedYes
Engine Oil Cooler IncludedNo
Outlet LocationBottom Right
Radiator Cap IncludedNo
Transmission Oil Cooler Fitting Diameter0.47 in / 12 mm
Transmission Oil Cooler Length13.27 in / 337 mm
Outlet Header Length22.4 in / 569 mm
Inlet Header Width3.46 in / 88 mm
Inlet Header Length22.4 in / 569 mm
Transmission Oil Cooler Fitting GenderFemale

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)
EncoreEssence, Preferred, Preferred II, Premium, Sport Touring2016, 2017, 2018, 2019, 2021, 2022

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.