GM Genuine Parts Radiator
OE
Pack of 1

GM Genuine Parts Radiator

GM Part #19256745

ACDelco Part #21647

MSRP$477.13*

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 Thickness1.34 in / 34 mm
Core Height17.25 in / 438.1 mm
ClassificationOE
Transmission Oil Cooler Distance between Fittings11.5 in / 292 mm
Tank MaterialPlastic
Inlet Diameter1.56 in / 39.5 mm
Internal Engine Oil CoolerNo
Transmission Oil Cooler TypePlate
Transmission Oil Cooler Fitting TypeQuick Connect
Transmission Oil Cooler IncludedYes
Engine Oil Cooler IncludedNo
Transmission Oil Cooler Plate Quantity7
Outlet LocationBottom Right
Transmission Oil Cooler Fitting GenderFemale
Down Flow Or Cross Flow TypeCross Flow
Frame IncludedYes
Outlet Diameter1.54 in / 33.3 mm
Radiator Cap IncludedNo
Core Width37.54 in / 953.5 mm
Transmission Oil Cooler Fitting Diameter0.47 in / 12 mm
Transmission Oil Cooler Length12.95 in / 329 mm
Inlet Header Width4.06 in / 103 mm
Outlet Header Width3.23 in / 82 mm
Inlet Header Length21.06 in / 535 mm
Outlet Header Length21.06 in / 535 mm
Internal Transmission Oil CoolerYes

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)
Avalanche 15002005, 2006
Silverado 1500Extended Cab PickupHybrid2005, 2006
Silverado 1500 ClassicExtended Cab PickupHybrid2007

Frequently Asked Questions