fans turns constantly 6000 rpm

You haven't given much information to go by, including the readings from iStat.

You may have a process such as a stuck print job causing your processor to run in excess. To find the process: From the terminal type top -u -s3 (to take samples every 3 seconds) and look at the output. This will give you the PID of the offending process. Write down/remember the PID. In the terminal you then enter kill -9 PID number. For example

kill -9 1111

This will kill the process 1111.

Also please tell us the process you used to reset the SMC.