GM GENUINE
More Information for GM GENUINE 21566
{Alternate Inventory Numbers: 22731217}
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GM GENUINE 21566  
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GM Genuine parts may ship in a GM Genuine or AcDelco box. The product will fit and function the same.
GM GENUINE 21566 Specifications
Coolant Level Indicator PortNo
Core Height (IN)14.6
Core Height (MM)370.78
Core MaterialAluminum
Core Row Quantity1
Core Thickness (IN)0.57
Core Thickness (MM)14.53
Core Width (IN)26.78
Core Width (MM)680.23
Down Flow Or Cross Flow TypeCross Flow
Engine Oil Cooler IncludedNo
Frame IncludedYes
Inlet Diameter (IN)1.34
Inlet Diameter (MM)34
Inlet Header Length (IN)17.05
Inlet Header Length (MM)433
Inlet Header Width (IN)2.8
Inlet Header Width (MM)71
Inlet LocationTop Right
Internal Engine Oil CoolerNo
Internal Transmission Oil CoolerYes
Mounting Hardware IncludedNo
Mounting TypePin
Outlet Diameter (IN)1.34
Outlet Diameter (MM)34
Outlet Header Length (IN)17.05
Outlet Header Length (MM)433
Outlet Header Width (IN)3.5
Outlet Header Width (MM)89
Outlet LocationBottom Left
Radiator Cap IncludedNo
Tank MaterialPlastic
Thermostat IncludedNo
Transmission Oil Cooler Distance between Fittings (IN)11.5
Transmission Oil Cooler Distance between Fittings (MM)292
Transmission Oil Cooler Fitting Diameter (IN)0.47
Transmission Oil Cooler Fitting Diameter (mm)12
Transmission Oil Cooler Fitting GenderFemale
Transmission Oil Cooler Fitting TypeQuick Connect
Transmission Oil Cooler IncludedYes

The radiator is the heart of a vehicle's cooling system. So, when it comes to replacing a worn radiator, you need a product that will match the original factory part in fit, form and function.

  • Superior fin waves provide a higher heat transfer
  • Lightweight; the radiators have a positive heat transfer to weight ratio
  • Corrosion-resistant aluminum core makes GM OE Radiators long lasting
  • Manufactured to GM OE specification for fit, form, and function
Service Tip: If you are experiencing unexplained or reoccurring radiator core leaks, or notice dark spots on your failed radiator core, test your coolant for Electrolysis. If detected, correct the source of the problem before replacing your failed radiator to prevent repeat failure.
Measurement Guide

Cooling System Maintenance | Tips & Tools

Without regular maintenance, cooling system components will degrade and fail prematurely, which can lead to costly engine damage. Protect your engine with simple preventative maintenance:

  • Completely drain and flush the system using Cooling System Flush prior to installation. Flushing the system is critical to prevent system contamination and failure.
  • Consider replacing the Radiator Hoses (and Hose Clamps), Thermostat and Radiator Cap as part of routine preventative maintenance. System contamination can cause these parts to degrade and fail over time, which can lead to severe engine damage from overheating.
  • Refill radiator with fresh Coolant / Antifreeze according to the volume and formula specified in your Owner's Manual. Inspect levels and condition every year.
OEM / Interchange Numbers: 15795494

Warranty Information:
Limited Lifetime