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The fans change speed depending on the temperature the sensors detect.
Give your machine a thourough cleaning.
The CPU sensor is usually located under the CPU if it's loaded with dust it may think it's hotter then need be and kicks the fan up.
As far as my experience goes :All computers have little coolant in the cooling system of the computer. A computer technician is able to locate it. This gets dried up over a long period and requires replenishment. So please get in touch with a technician and have it replaced/replenished. I had similar problem with my laptop which was more than 5 yrs old and I was lucky to get a technician who did this replenishment job for me. It costed me roughly 10 US dollars. I never had the overheating problem again though the normal heating does take place.
The individual fans are, most certainly, 12 VDC. Although I'm not sure if you are refering to individual fans, or the tray itself (I know most cisco products input voltage is ~120 VAC). If you are looking for a replacement fan, If would try the cisco website (if you have an extra arm and leg to spare). Or, if your as broke as the rest of us, you could try ebay.
ps. I ebay'ed cisco fan tray... I found complete fan trays... Most expensive 49.99 + shipping
If you are asking about a desktop PC, yes, they are really cheap and easy to replace. If you are asking about a laptop, it's a little bit difficult. You need to go to ebay and find a replacement fan and some laptops need complete tear down in order to replace the fan or cpu, etc. it all depends on the brand and model of the PC. Some are somewhat easy to reach the fan. I suggest you buy a Notebook cooling pad which cost really really cheap. Some are about $10. Of course there's nothing better than the internal fan of the CPU but it could be an option WHILE you take it to a repair center.