Add Windshield Wiper / Washer Fluid: 2026 GMC Sierra 1500 AT4 6.2L V8

Adding windshield washer fluid to your 2026 GMC Sierra 1500 is a fairly straightforward process. The video above shows you where the window washer fluid reservoir is located in your Sierra 1500, how to remove the reservoir cap and how to refill the windshield wiper / washer fluid. The nice thing about adding windshield washer fluid is that you can't overfill the reservoir - once it's full, you can stop adding fluid!