The fan on my brand new Imac Quadcore is blowing extremely loud. Is this normal

The fan on my brand new Imac Quadcore is blowing extremely loud. Is this normal?

I have the same problem on my 2010 IMAC 27" I7. Even if the mac is running at idle it occurs. It was already at the apple store for repair.
Later they told me, they found nothing with the hardware test so its not their problem?!!!
the activity monitors shows also nothing special, even the cpu's are at idle. No streaming or rendering, just working on the web or some normal documents...
I runned smcfancontrol to check whats going on. It seems that the onboard temperature sensor is measuring wrong instantly so they SMC thinks, its to hot/or not and then spinning up the fans to full power.
SMC reset is not really working, or just for some hours.
Can anybody else help?
Thx

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