Just open your laptop and remove the dust you see at your FAN & FAN filters
And other hardware or places on the motherboard.
Use:
A can of compressed air, a soft-bristled brush and a small vacuum cleaner may all come in handy.
And if you use vacuum cleaner or compressed air on your fan Hold it on so it doesn't spin that can damage it.
ACER PREDATOR G9-791 |Intel Core i7-6700HQ |16 GB RAM |GTX970M 3GB |FULL HD | 750GB SSD | Samsung 850 PRO & 2X M.2 SSD RAID 0
G75VW |Intel Core I7-3610QM |24GB RAM |GTX670M 3 GB |FULL HD | 526GB SSD | Samsung 840 EVO & 850 PRO
GL552VW |Intel Core i7-6700HQ |12 GB RAM |GTX960M 3GB |FULL HD | 256GB SSD | Samsung