Fan Activity during hardware test

hi everyone,
when i start the hardware-test, the fan of my mac is speeding up to maximum level. it happens when i hit the hardware-test button in the "start-up-disk window". is this okay?

Dear klangapparat,
Welcome to Apple Discussions.
The fan are running high during the Hardware test because the unit is in the firmware mode which is at a very basic level , kind of only assembly code runnig to let the unit do some task. However when you load the OS then the the OS has a code and a driver running for each and every hardware. There is a code which is responsiable for the speed of fans that code is missing during the test so the fans run at full speed. There is nothing controling the fans speed.
Hope this information helps.
Good Day!
Ravi Dimri.

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