pikaru
Distinguished
My Acer 6530g needs cleaning every 5-6 months. When dust builds up at the back of the heatsink temps start to go up to 60ºs idle and 90ºs under load. After cleaning temps drop 20-25º. I'd say try and clean the dust in your notebook. Hope this helps:
http://support.dell.com/support/edocs/systems/ins1525/en/SM/cpucool.htm#wp1179839
http://support.dell.com/support/edocs/systems/ins1525/en/SM/cpucool.htm#wp1179839