GM GENUINE
More Information for GM GENUINE 21687
{Alternate Inventory Numbers: 84494240}
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GM GENUINE 21687  
$390.79
Price
 $0.00
Core
 + Sold in packs of 1x1
Pack
 $390.79
Total
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GM GENUINE 21687 Specifications
Coolant Level Indicator PortNo
Core Height (IN)17.25
Core Height (MM)438.1
Core MaterialAluminum
Core Row Quantity1
Core Thickness (IN)1.06
Core Thickness (MM)27
Core Width (IN)34
Core Width (MM)863.6
Down Flow Or Cross Flow TypeCross Flow
Engine Oil Cooler Diameter (IN)0.65
Engine Oil Cooler Diameter (mm)16.62
Engine Oil Cooler Fitting Diameter (IN)0.63
Engine Oil Cooler Fitting Diameter (MM)16
Engine Oil Cooler Fitting GenderFemale
Engine Oil Cooler Fitting TypeQuick Connect
Engine Oil Cooler Fittings Distance Apart (IN)11.5
Engine Oil Cooler Fittings Distance Apart (mm)292
Engine Oil Cooler IncludedNo
Engine Oil Cooler Length (in)12.83
Engine Oil Cooler Length (mm)326
Engine Oil Cooler Number of Plates3
Engine Oil Cooler TypePLATE
Frame IncludedYes
Inlet Diameter (IN)1.53
Inlet Diameter (MM)38.91
Inlet Header Length (IN)18.5
Inlet Header Length (MM)470
Inlet Header Width (IN)3.23
Inlet Header Width (MM)82
Inlet Location1.31
Internal Engine Oil CoolerNo
Internal Transmission Oil CoolerYes
Mounting Hardware IncludedNo
Mounting TypeBraket
Outlet Diameter (IN)1.54
Outlet Diameter (MM)33.27
Outlet Header Length (IN)22.4
Outlet Header Length (MM)569
Outlet Header Width (IN)3.86
Outlet Header Width (MM)98
Outlet LocationBottom Right
Radiator Cap IncludedNo
Tank MaterialPlastic
Thermostat IncludedNo
Transmission Oil Cooler Diameter (IN)0.49
Transmission Oil Cooler Diameter (mm)12.5mm
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
Transmission Oil Cooler Length (in)13.11
Transmission Oil Cooler Length (mm)333
Transmission Oil Cooler Plate Quantity6
Transmission Oil Cooler TypePLATE

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.

Warranty Information:
Limited Lifetime