I suggest you clean the laptop's air INTAKE duct, with air from a can of compressed air for computers.
1) ALL power removed from the laptop. AC adapter (Charger) and Battery.
2) Laptop closed and turned over, Front facing you.
The Air Intake Duct is up on the right, IN the removable panel.
It has 14 vent slots. 2 columns of 7 slots.
This is where the Cooling Fan draws air up, and in.
The air is then exhausted to the outside vent of the case.
Use Short Bursts of air. Squeeze the trigger in all the way, then let go fast.
{Note*
You don't want to spin the fan faster than it was designed for.
Spinning the fan faster than it was designed for, can lead to premature failure of the Fan's bearings }
I suspect though, that the 'Gunk' inside is going to need to be physically removed.
Don't forget to use an ESD wrist strap, and connect the alligator clip to a good ground source.
Here is a free Service Manual in PDF file form. Allow a few seconds for the first page to come up, and additional time for the file to fully download.
http://tim.id.au/laptops/acer/aspire%205920g.pdfRegards,
joecoolvette
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