Pontiac Bonneville Noises Grind

Like The Subject Says, When I Turn The A/c On.. There's A Very Loud Grinding Noise And No Air Comes Out. Any Ideas?

My 1998 Pontiac Bonneville Makes A Little Grind Noise Only When I Rev It Up High So I Took The Engine Cover Off And Show A Little Leak By My...

Hi, Ok So I Havent Been On Here In 6 Months, Iv Ben Sick, And I Used To Be A Moderater Anyways I Dont Know What Happend, Ok So Im Ase...