See also:

Automatic Operation
AUTO (Automatic): When automatic operation is active, the system controls the inside temperature, the air delivery, and the fan speed. Use the steps below to place the entire system in automatic mode ...

Footnotes — Maintenance Schedule Additional Required Services — Severe
a) Or every two years, whichever comes first. b) Check all fuel and vapor lines and hoses for proper hook-up, routing, and condition. Check that the purge valve, if the vehicle has one, works properl ...

Exterior
The Yukon has a one-piece grille and taller headlights than its sister Tahoe, with jewel-like bezels and a wider, lower air dam. The rest of the body features blocky fenders, long rear-quarter win ...