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It is probably a worn blower motor, because it happens with AC, and/or HEAT. When you brake or speed up, you are changing the speed of the motor (adding and taking away resistance to it's spinning). This will cause more of a noise until you reach your cruising speed again.

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Q: Why is your car making a grinding noise when you have the AC or heat on and you brake to slow the car and or give it gas?
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