1999 GMC Yukon Owner's Manual - Page 106

yellowblue Windshield Washer At the top of the lever, there's a paddle with the word PUSH on it. To spray washer fluid on the windshield, push the paddle. The use of hood-mounted air deflectors may adversely affect windshield wiper and washer performance. Rear Window Wiper and Washer The rear window wiper and washer switch is on your instrument panel, to the right of the gage cluster. CAUTION: In freezing weather, don't use your washer until the windshield is warmed. Otherwise the washer fluid can form ice on the windshield, blocking your vision. Washer fluid will spray as long as you push the paddle. When you let go of the paddle, the wipers will continue to wipe for a few seconds and then either stop or return to the preset speed. To turn the wiper on, slide the switch all the way up. For delay wiping, slide the switch even with DELAY in the center position of the rear wiper control. The wiper will cycle every nine seconds. 2-36