Problems with CTR climate

Hello, have problems with my climate. I have the feeling that it is constantly going on and off during operation. If you drive around 4500 (climate, fan on 2, car not too warm in the interior) constantly on a straight track, then it feels as if someone is constantly pulling the hand brake and releasing it quite quickly. I realize that the climate costs power and that you notice this, but not constantly changing it (5-10 seconds). Or is that perhaps normal with the CTR. It also makes it quite loud as if it has eaten itself. Do you also have such experiences with the climate. Can it be that the regulator spins, or is it the climate itself???? Gruss Olli