Blower Motor on 2002 Mercury Grand Marquis

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My Blower keeps running in high speed and want change. You can't turn it off, you can't afjust it manually. I was told that it was the resistor. Can you direct me. Thanks
P.S. Do you know of a WEB Page where I can locate various compartments (Parts)??
(1) Answer
(2) Comments
Do you have automatic temperature control (digital temperature on readout)?

If so, it's likely your blower speed controller that has failed.

That's a web site you can access shop manual information at - for a nominal fee, I believe.
Yes it has Automatic Climate Control. A Digital Display. Where can I locate this parts under the hood.????
The Blower Speed Controller is under the hood near the heater core. You have to remove the vapor management valve and the core hoses to access it.