Is this a new laptop? If it is, then dust inside shouldn't be an issue. So, it may simply be the nature of the laptop. Heat and ventilation are issues with pretty well all modern thin laptops. You might want to do what I did: I took a strip of lumber, about 3.5 cm. wide x 2 cm. high (1.5" x 3/4"}, and the length equal to the width of my laptop. I routed out two notches to accommodate the laptop's rear feet. The rear of the laptop sits in those notches, propping up the rear by 2 cm. That provides better ventilation underneath the laptop and makes it easier for the fan to draw in air via the bottom vent.  It's cheap insurance, and also positions the keyboard at a slight angle that makes typing more comfortable. It won't solve a major heat issue, but it helps somewhat.
I've been having problems with my Dell Inspiron 14 2-in-1 cooling.  It heats up when updating and when charging could anyone help me? (I'm also wondering if I could upgrade the cooling fans.)
Heating Problems For Dell Inspiron.