Coolant Radiator Fit Chevrolet Colorado GMC Canyon V6 3.6L 2017-2022 CU13689

If your 2017-2022 Chevrolet Colorado or GMC Canyon is running hot, leaking coolant, or showing signs of a failing radiator, this direct-fit CU13689 replacement unit is the straightforward fix your truck needs. Engineered to OE specifications for the 3.6L V6 with an automatic transmission, it drops in without modification and gets your cooling system back to factory performance the same day. Compatibility This radiator is purpose-built for the second-generation Chevrolet Colorado and GMC Canyon — specifically trucks equipped with the 3.6L V6 engine and an automatic transmission, covering model years 2017, 2018, 2019, 2020, 2021, and 2022. The automatic transmission variant is required because this unit incorporates an integrated transmission oil cooler with dedicated inlet and outlet fittings. It does not fit trucks running the 2.5L four-cylinder engine or the 2.8L Duramax diesel, as those platforms use a different radiator core and mounting configuration. Before ordering, cross-reference part number CU13689 against your existing radiator to verify port placement, tank dimensions, and cooler line routing match exactly. If you are unsure, locate your engine code on your door jamb sticker or check your owner's manual. Benefits • Direct bolt-on installation: OE-matched mounting tabs, hose ports, and transmission cooler fittings mean zero cutting, drilling, or fabrication — pull the old unit, swap in the new one. • Restores factory cooling capacity: Whether you are towing a trailer, hauling a payload, or sitting in stop-and-go traffic, this radiator keeps your 3.6L V6 in the safe operating temperature range. • Integrated automatic transmission oil cooler: The built-in ATF cooler keeps transmission fluid temperatures controlled under load, reducing wear and extending transmission service life significantly. • Precision-welded construction: Seams and end-tank joints are robotically welded to minimize leak points — a common failure mode on aging plastic-tank OEM radiators. • Compatible with OEM and aftermarket hoses: Upper and lower hose ports match factory dimensions, so you can reuse existing hoses or swap in any standard Colorado/Canyon replacement hoses without adapters. • Cost-effective OE alternative: Delivers factory-equivalent performance at a fraction of the dealership parts counter price, making it the smart choice for DIY mechanics and independent shops alike. Technical Specs • Part Number Cross-Reference: CU13689 • Vehicle Fitment: 2017-2022 Chevrolet Colorado / GMC Canyon, 3.6L V6, Automatic Transmission only • Core Type: Aluminum multi-row cooling core • End Tanks: Composite polymer end tanks with precision-welded aluminum core connections • Transmission Cooler: Integrated automatic transmission oil cooler (internal type) • Upper Hose Port Diameter: OE-matched to factory specification • Lower Hose Port Diameter: OE-matched to factory specification • Transmission Cooler Line Fittings: OE-matched quick-connect or threaded fittings per factory routing • Mounting Configuration: OE bolt-on, matching factory upper and lower mounting tabs Materials & Build Quality The core of this radiator is constructed from high-grade aluminum alloy, chosen specifically for its superior thermal conductivity compared to plastic or low-grade composite materials. Aluminum transfers heat from coolant to ambient air faster and more efficiently, which directly translates to lower engine operating temperatures under demanding conditions like towing or sustained highway driving. The end tanks are molded from reinforced composite polymer that resists cracking and warping under repeated heat-cycle stress — the same type of thermal fatigue that causes OEM plastic-tank radiators to fail after years of use. All seam welds between the aluminum core and tank connections are made to tight tolerances, dramatically reducing the risk of the pinhole leaks and seam failures that are among the most common causes of radiator replacement on aging trucks. The transmission oil cooler circuit is fully integrated into the lower tank, using dedicated fittings that match OE connection points so ATF routing requires no modification to existing lines or brackets. Installation Guide Installing this radiator is a straightforward job for any mechanically confident DIYer with basic hand tools. Plan for approximately two to three hours. Begin by allowing the engine to cool completely — never open the cooling system on a hot engine. Drain the existing coolant by opening the petcock at the base of the radiator into a clean drain pan rated for at least two gallons; dispose of used coolant responsibly per local regulations. Disconnect the negative battery terminal. Remove the upper radiator hose clamp and slide the hose off the port. Repeat for the lower hose. Disconnect the transmission cooler lines from the lower tank fittings — have rags ready as residual ATF will drip. Remove the upper radiator support brackets or hold-down bolts (typically two to four fasteners depending on trim level). Carefully lift the old radiator straight up and out of the engine bay, keeping it level to avoid spilling residual coolant on belts or sensors. Lower the new CU13689 unit into position, aligning the lower mounting grommets into their cradle points first, then seat the upper tabs. Reinstall hold-down bolts and torque to factory spec. Reconnect both radiator hoses and tighten clamps firmly. Reconnect transmission cooler lines until you hear or feel them click or are threaded fully. Refill the cooling system with the correct 50/50 coolant mix specified for your Colorado or Canyon — typically Dex-Cool for GM vehicles. Reconnect the battery, start the engine, and allow it to reach operating temperature while monitoring for leaks at all connection points. Check the coolant level after the thermostat opens and top off as needed. What's in the Box • 1x CU13689 direct-fit replacement coolant radiator (integrated transmission oil cooler included) • Mounting hardware (where included — verify listing at time of purchase) Why Shop With Us We specialize in truck and commercial vehicle parts that ship fast, fit right, and deliver real-world durability. Every product we list is vetted for accurate fitment data — no guesswork, no vague compatibility claims. Our product pages give you the specifics you need to order with confidence, and our support team understands the difference between a 2.5L and a 3.6L Colorado. We stand behind accurate fitment or we make it right, period. Don't let a failing radiator sideline your Colorado or Canyon. Order the CU13689 direct-fit replacement today, get it installed this weekend, and get back to work — fully cooled, leak-free, and road-ready.