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Q:

white smoke coming out of the exhaust on 2005 Chevrolet Avalanche 1500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
white smoke coming out of the exhaust and rattle when acceleration
(1) Answer
Looks like a cylinder head / cyl. head gasket problem. Coolant enters to one or more of the combustion chambers.

Zee