blower motor location on 2002 Mercury Grand Marquis

I have heat in my car, but the motor is not blowing out the air. I need to check it, but am not sure where it is exactly located.

Asked by for the 2002 Mercury Grand Marquis
Located in the engine compartment passenger side firewall looks like a black box with two heater hoses coming out of it, Follow the wires and it will look like a snail about 6 to 8 inchs across.
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