Aluminum Coolant Radiator For 2017-2022 Chevrolet Colorado & GMC Canyon V6 3.6L, OE CU13689

A Coolant Radiator for the Colorado and Canyon

This is an aluminum coolant radiator built for the 2017-2022 Chevrolet Colorado and GMC Canyon with the V6 3.6L engine, cross-referenced to part numbers CU13689 and 84671373. If you're seeing your temperature gauge creeping higher than normal, noticing coolant loss without an obvious leak, or dealing with a radiator that's simply original to a truck well past 100,000 miles, this radiator replaces the complete unit as a direct fit.

Why Radiators Wear Out on These Trucks

A radiator's job is to pull heat out of the coolant as it circulates through the engine, and it does that through a core made of narrow channels and fins that are especially vulnerable to corrosion and small leaks developing over years of heat cycling and exposure to road debris. On a Colorado or Canyon with the 3.6L V6, the radiator also has to keep pace with a bigger engine's cooling demands than the four-cylinder version of these trucks, which is part of why a radiator sized correctly for the V6 matters rather than assuming any Colorado-fitting radiator will do the job.

Key Features

• Cross-referenced to part numbers CU13689 and 84671373
• Aluminum core with plastic end tanks
• Louvered core fins for improved airflow and heat transfer
• Direct-fit replacement for automatic transmission models
• Backed by a 2-year manufacturer warranty

Specifications

• Core material: Aluminum
• Tank material: Plastic
• Core size: 24.8 in. x 24.72 in. x 1.02 in.
• Flow type: Down flow
• Transmission type: Automatic
• Warranty: 2 years against manufacturing defects
• Condition: New

Compatibility

Fits the 2017-2022 Chevrolet Colorado and GMC Canyon with the V6 3.6L engine and automatic transmission. Because these trucks were also offered with four-cylinder and diesel engine options across this generation, it's worth confirming your specific truck has the 3.6L V6 before ordering, since the four-cylinder and diesel versions use differently sized radiators.

Signs Your Radiator Needs Replacing

A failing radiator on a Colorado or Canyon typically shows up as a temperature gauge that climbs higher than normal, especially in stop-and-go traffic or while towing, coolant that needs topping off more often than it should without a visible puddle underneath, or in more advanced cases, visible corrosion or a crack along one of the tank seams where it meets the core. Because a slow coolant leak can be easy to overlook until the engine actually overheats, checking coolant level regularly on a truck with over 100,000 miles is worth the minor effort.

Why Replace the Complete Radiator

Once a radiator's core has developed internal corrosion or a tank seam has started seeping, there's no reliable way to repair it that holds up long-term, since the aluminum core itself is what's degrading rather than a single gasket or hose connection. Replacing the complete radiator with a new aluminum-core unit means starting with fresh internal passages that haven't accumulated years of mineral buildup, which also tends to improve cooling performance compared to an old radiator that was technically still holding coolant but no longer transferring heat as efficiently as it once did.

Installation Notes

Replacing this radiator means draining the cooling system, disconnecting the upper and lower radiator hoses along with the transmission cooler lines, removing the radiator's mounting brackets, and lifting the old unit free before installing the new one in reverse order. Because this radiator is built for automatic transmission models with transmission cooler lines running through the tank, double-checking that your truck's configuration matches before ordering avoids a mismatch at installation.

Ordering Information

This coolant radiator is in stock and ships ready to install. Our Shipping Information page covers current timelines, and our Warranty and Returns pages explain what to do if anything isn't right on arrival. Not sure this matches your specific truck's engine? Our Request a Part page is the fastest way to confirm before you order.

Related Parts

This coolant radiator is listed in our Chevrolet and GMC collections, along with our Cooling System collection, where you'll find other parts for the Colorado and Canyon.