Google away for DV6xxx series on its issues. You'll find numerous complaints about heat and failures, so beware. Also, HP own forums may shed light on the topic too. Its the nature of this laptop to be heat stressed, so dump it, IMO as soon as you can, sorry. You've done as much as you can and see no better cooling other than having an A/C unit under it. But, some users have installed a s/w patch that seems to address the cooling in the fan control of operation, check the HP support website for it. Battery recalls are also known, again verify yours at HP.
i have and hp pavilion dv6-3122er which i bought 5months ago. the problem is that its so hot,even when am just doing simple things like browsing or playing music. temperatures reach up to 75degrees celsius. i have cleaned the vents very well but its stil as high as 60degr. whats even more worry is that am also using a cooling fan/pad. what can i do?could it be software,battery or what? its too new to be this hot.! help plz