2003 Mitsubishi Lancer Evolution

Noises problem
2003 Mitsubishi Lancer Evolution 4 cyl All Wheel Drive Manual 65000 miles

I broke the knob on my climate control and my ac button on stuck on. I ran my heat while it was stuck on. I replaced my climate control panel with a new one. The night before I replaced it my heater stopped blowing warm air. Whenever I have my ac or heat on (even though heater isnt working) it makes a loud high pitched squelling noise. After chaning out my climate control my ac works great but my heater wont blow hot and it still makes a high pitched squelling noise whenever I have my climate control on.
January 22, 2009.

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