This video will show you how to drain the entire cooling system, replace the coolant Degas bottle/reservoir and then refill the cooling system with fresh coolant on the L5P Duramax 2017-Present found in the GMC Sierra and Chevy Silverado 2500 & 3500 trucks. This pocedure will also cure the common issue these trucks face with the "Low Coolant Level" light that seems to never go away. GM recommends refilling the reservoir using the vacuum tool that way you don't get air pockets in the system leading to cavitation or air in the heater core thus not creating heat through the interior vents. Coolant reservoir and vacuum coolant refilled tool was purchased from Amazon coolant and distilled water was purchased from Walmart.com and I have listed below links to all the products.
GM Coolant Reservoir: amzn.to/3IIGO6N
OEM Tools Vacuum Coolant Refill: amzn.to/3IIHpW5
Peak Dexcool Concentrate: goto.walmart.c...
Distilled Water: goto.walmart.c...
Dorman Vacuum Caps: amzn.to/3GYr4dJ
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