Why won't the fan on my MB Pro 13" speed up?

Hi
I run a MacBook Pro 13" with a 2.26 GHz Intel Core Duo 2, which i bought in autumn 2009. Since a while I have noticed that it sometimes get's pretty hot (you can feel it on the left side, just over the connections for usb, power and so on), and I've also noticed that the fan is never speeding up (always stays on 2000 rpm). This problem is pretty new, and the fan where working alright earlier, so now I'm really wondering what's the trouble and how I do fix it.
Also my computer sometimes refuses to wake up when I put it in sleeping mode (turning down the screen), and I think this problem started to appear at around the same time.

Don't worry about the temperatures and the fan not kicking up. My 2010 MacBook Pro 13 speeds up the fans when it reaches about 75 degrees celcius. It all depends on the CPU load and temperature, nothing to worry about its normal.

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