Will opening the laptop screws void the warranty?

I have a Dell G3 3590 with a 1660ti and i5 9300h, i've recently run into some thermal issues. It used to work completely fine two weeks ago and had an avg temperature of 40-45 degrees Celsius running under a simple work load. But now its running at 60-70 C under the same work load. I have reason to believe that it might be because of the dust thats been accumulating inside. I just want to clean the insides for better airflow. Also will the people at dell be willing to help if I to them for this cleaning .