voluntary, you cause your lips to form the shape to whistle, and cause the air to be pushed out. if whistling were involuntary, you would do it without making an effort (like your heart pumping, digesting things, etc)
the african booty scracher
Your brain.
bad wheel hub cap
whistling noise from engine will be caused by a leaky gasket,sucking air. this is usually the intake manifold gasket
tardive dyskinesia
Something that causes an involuntary action
natural reactions
It is caused by involuntary muscle contractions.
Gmtjh
it is a problem in the nervous system
Possibly a bad wheel bearing.