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2019-2024 Sierra/Silverado: Coolant Flush/Exchange

Time: approx 2 hrs

Difficulty: moderate (high temps)

Cost: $100-150 (coolant, flush agent)

Interval: 5yrs or 150,000 miles


The job of any coolant is to provide maximum temperature protection range against boiling and freezing without damaging the parts it's meant to protect. Manufacturers use various solutions and additives to accomplish this, but over time they all break down. When they do, oxidation and corrosion start causing leaks and component failures.


Most extended life coolants are now promising protection of up to 5 yrs/150,000 miles. However, staying ahead of the interval on this one is definitely recommended. Once the corrosion inhibitors break down, the coolant becomes caustic to metal parts. This is when radiators, water pumps, and head gaskets start failing, which are not cheap or simple repairs.


When you flush the coolant, you want to stay safe against being scalded. Don't attempt this service in ignorance. To get a complete flush, you either have to remove the thermostat to achieve full circulation, or perform several drain and fills between drive cycles. Supplementing the service with a flushing agent is a good idea to strip rust and buildup from the system.

Watch the video below to see how the coolant was exchanged on a fourth generation (2019-2024) GM 1500 series product (Silverado/Sierra/Yukon/Tahoe/Suburban/Escalade)

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Dexcool Concentrate

ACDelco Dexcool Extended Life Coolant (concentrate)

Spring Clamp

7" Spring Clamp, 4pc

Antifreeze Tester

Test coolant protection range

Disposable Gloves

8mil disposable work gloves

Radiator Flush Treatment

BlueDevil Radiator Flush & Degreaser

3/8" Clear Tubing

3/8" I.D. clear vinyl tubing, 10'

Coolant Drain Pan

Coolant Drain Pan

Disposable Shop Towels

Scott Blue Shop Towels in a Box

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