How to slow down the fan?

[shiyao ma <i@introo.me>]

Hi, everybody.
     About a month ago, I posted a mail here, asking for help on how to cool down the temperature on debian(when in windows, the temperature is fine). And later, I have tried a lot of methods, but none has produced any result.So, today, I went out to let a worker clear the dusts of my laptop and installed a new fan on the laptop.
    Now, the temperature is fine, but the fan keeps running. I guess this is because I installed the xorg-radeon-driver, maybe fglrx will slow down the fan?
I am now in debian wheezy, and I find package fglrx is not in testing, but in squeeze. So, is it feasible to install the fglrx in squeeze? If is, the how to?
Thx