air condition compressor on 2007 Scion tC

Notice my a/c not cooling but when running the a/c a noise from the compressor sounds like a click from a switch and a pressure release valve sound at the compressor. what could be wrong ?

by in Los Angeles, CA on September 05, 2010
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1 answer
ANSWER by , September 06, 2010
if you hear a clicking on and off you are probably low on refrigent