2004 Buick Century Q&A

2004 Buick Century Question: MY 2004 Buick Century is making a hissing squealy noise

For a while when I shut off my car it would make a hissing type squealing noise. Now it started to happen when I drive also; but it would stop hissing when I put the fan on. Sometimes when i change the temp controls it will stop but not all the time. It only stops ALL the time when i put on the fan. What could this be? -
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