If you were hearing the squeak it's your blower motor dying. The squeal should be more annoying at low speeds and if you increase the speed of the fan the squeal would go away. If that sounds right then, Save your money and do not buy the FSR but buy a motor and replace it. Be aware this job is not for the faint hearted. You will have to remove the whole dash. If you take it to a INDY shop expect to pay 6-8 hours labor plus parts. Do a search on blower motor and you will see my post about when I replaced mine.

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2010 X5M /// R63 AMG...Wifey's 540HP Family Hualer

2001 X5 3.0i Sport 335,448 miles & counting...
SMG M3 Steering wheel
E46 Stainless Racing Headers
4.6is Exhaust
Turner Pulleys
Afe Intake
Brembo drilled rotors
PowerFlex Bushings
Hualingan
30mm H&R Spacers rear
20mm H&R Spacers front
Bavarian Autosport High-Performance Coils
Active Autowerke's Performance Software