Q: I'm not sure what's wrong or what I need to fix.

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When I turn the heat on its hot. Then something makes a noise almost like a grinding or like something can't turn and it sounds like it coming from my dash or glove department and when it makes the noise the air gets cold and blows real hard then when the noise quits it's goes back to being hot and blowing normally. When I turn the air conditioning on, it does the same thing. Hot air then it makes the noise and cool then the noise stops and hot air kicks back on. I need to know what's wrong and what I need replaced.

My car has 84000 miles.
My car has an automatic transmission.

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