Hi @leipa ,
Does the laptop shutdown or give you a message etc regarding overheating?
What program(s) are you using when the laptop overheats?
Is the fan running on 'high speed' all the time from when you first start the laptop?
Open Task Manager (right click on taskbar and click on Task Manager) and check the CPU % usage. If high check what apps/services/processes have high usage. Find out which ones and why they have.
Which exact DV3 model laptop do you have?
Is there enough RAM installed for the tasks / program(s) that you want the laptop to perform / run?
Is the HDD activity light on continually because the HDD is being used as RAM.
Have you checked Event Viewer to see if there are any clues to be gathered from there regarding your problem?