Macbook Air 2009 Fan problems

I'm having an issue with my 2009 Macbook Air 1.86ghz.
Since I updated OS X to 10.6.8 I've been noticing increased fan noise for some reason, temperatures are OK but fan speeds shoot up to 6000rpm under minimal load and remain there for a good while even if close every app, sometimes I have to close the lid and open it back for it to stop.
I'm running coolbook. My idle cpu temp is somewhere between 38º and 45ºc, it rarely goes over 65º (watching flash video on a hot day) and right now as I'm typing I'm reading 51ºc with nothing else open, CPU running at 800mhz, no usage on activity monitor but the fan is running at 6000rpm, the laptop feels warm near the F2 key only.
This has been happening since the 10.6.8 update only, before that everything was cool and quiet no matter what I did.

Try a SMC reset, see if that helps.
http://support.apple.com/kb/HT3964
Regards,
Captfred

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