According to my manual for the Lippert system, First make sure you have enough fluid in the resevoir. You need automatic transmission fluid & the resevoir should be filled to within 1/2 inch of the top when all slides in & landing gear up. Then operate the slide several times & the air will be worked out of the system.
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2011 Silverado 3500HD Dually
2010 36RESB3
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