1991 toyota previa mini van a/c whistles loud when turned on

[quote:5bcca5c1ec="ahamka"]i have a 1991 toyota previa with 175,000 miles on it. everytime i turn on the a/c it makes a very loud whistling noise and it stays on for as long as i leave the a/c on , however i do have cold air coming out i dont know what the problems is please help me to even get started thank you.[/quote:5bcca5c1ec]

The A/C compressor is coming to its end. Perhaps the clutch