Why Are The Fans On My Imac Constantly Running At High Speed

I already had an SMC-based SSD Fan Control and HDD Fan Control on my Computer but it didn’t help. Then I put the old broken Seagate HDD in again (with temp sensor) but still the fans are running high. The only thing I noticed was that my frame is a little to high because now there is a small gap between the glass and the aluminium.

The iState showed that the temperature with hot-wire is 3 degrees Celsius without hot-wire its 9 degrees Celsius.

Please Help don’t know what to do :/

Thank you very much in advance for your answer :)