Fan isnt working

my hp laptop 15 notebook i don't think the fan is running but i got no error warning  
when im watching a video  it over heats   i have coolsense running   but i feel no heat coming from the vents  it builds up and i am forced to shut it down  for an hour

Fans do fail. 
Have you contacted tech support?
Is the computer on a flat hard surface with nothing obstructing the vent slots on the bottom of the computer?
Don't run it if it is too hot to hold your hand on the bottom of the case. 
If it is still under warranty, get tech support on the phone as soon as you can.
Since you said CoolSense is running, you might check to see if the CPU clock is being throttled down.  You can check that by opening the Task Manager and click the Performance tab.  The picture below is a screen capture on my Envy running a video rendering program which typically heats a computer up.  In the screen shot the period between the arrows was over three minutes during which CoolSense has throttled the clock speed up and down 4 times to keep the computer from overheating. My computer "speed" was shown as 1.46 GHz because it was running hot.  When running cool, it would be running at over 3.1 GHz.
Cheers, Mike

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