Does your 2013 i5 or i7: with 4 or 8GB RAM and 128 or 512 SSD heat up while very normal use (refers to safari/mozilla/chrome open, skype call, total finder on) and nothing else in the background:
Having a browser and Skype call running can easily be enough to cause temps to rise significantly. That's normal. If you're not already doing so, use iStat Pro (free) or iStat Menus ($16) to get accurate readings of your temps, fan speeds, etc., rather than relying on your sense of touch or sound. A forum member has posted a copy of iStat Pro that has been "tweaked" to enhance compatibility with Mountain Lion. You can download it here.Does your 2013 i5 or i7: with 4 or 8GB RAM and 128 or 512 SSD heat up while very normal use (refers to safari/mozilla/chrome open, skype call, total finder on) and nothing else in the background:
Your fans are always on when your Mac is on, spinning at a minimum of 2000 rpm (for MBPs) or 1800 rpm (for MBAs, MBs and minis), or 1200 for the newest MBAs. Older iMacs have 3 fans with minimum speeds in the 800-1200 range, while the newest iMacs have a single fan, spinning at a minimum of about 1400 rpm. They will spin faster as needed to keep temps at a safe level. If your fans are spinning up without increased heat, try resetting the SMC. (PRAM/NVRAM has nothing to do with these issues, so resetting it will not help.)The bottom of your Mac notebook may become very warm during normal use. If your notebook is on your lap and gets uncomfortably warm, move it to a stable work surface that allows for good ventilation.