My fan always runs on my macbook, any tips?

Currently I have my macbook on a clean desk with good ventilation, but my fan always runs, even if there are no programs open. I've reset the SMC, and checked that theres no printing jobs in the printing queue but no luck. I've had this macbook for about a year and a half and have used it a ton since then. I dont want anything to burn out or break in my laptop. Any tips? thanks

I have the same problem on my late 2008 Macbook white 2.1 GHz Intel duo, running 10.5.8. I had read in another post here that I should check Activity Monitor and I did so. The first time I tried, as soon as I launched AM the fan stopped. I then left AM open and the next time the fan started (I was online, doing nothing in particular - I did have 4 or 5 panels open though) I checked AM and the process that came at the top of the list with 90-odd CPU usage was kernel_task. I quit AM and then launched it again and the fan stopped, with kernel_task taking up about 2% of the CPU and Safari around 30%.
What's going on? Hardware? Software?

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