See also:

Ventilation
To operate the ventilation system: o Set the air intake control to "Fresh" mode (). o To direct all intake air to the dashboard vents, set the airflow control to "Face" (). ...

Hybrid-ness
Before I get into the performance and technology aspects of what makes the Sonata Hybrid tick, I've got to point out the fact that the Sonata Hybrid looks dramatically different from its gasoline- ...

Check Spark Plugs and Ignition System
Inspect your spark plugs and replace them if necessary. Also check all ignition wiring and components to be sure they are not cracked, worn or damaged in any way. ...