When I shutdown the fan turns on very loud and fast.. Quiet during running

Had my imac about 2 months now its the late 2012 27" iMac
When running its fine... Hardly makes a noise, however today i shut it down and about 5 seconds after it shuts down the fans kick in really loud this never happened before
If I put the computer in sleep mode it does not start fans only when it's shut down... Only way to stop it is to turn it off at the wall
I have run AHT and no problems
I have reset both SMC and PRAM neither fixed it.. Any ideas??

anyone?
someone please help!! lol

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