Acers are known to have heating issues, hence your issue. Your best bet may be to look into a cooling mat that you set under the laptop and depending on the model usually has 2-4 fans that are powered by USB. This may help you out by getting the temps down a few degrees. Also, ensure that all the heat release ports are clear of dust and such.
Hi i have the same problem with acer 5536, its a design fault,i very stupid 1 at that, anyway the vent on the bottom is closed of and it should be opened, i used a stanley knife to open each slot its very time consuming and u need to be careful that u dont damaged the case, since i have opened the vent i have no problems with over heating,before it would run around 94 to 101c when playing games,now the highest it goes is 67 to 78c.