Hi there!

Are you sure this is Linux/Ubuntu related? The Dell Vostro 3700's cooling 
system is basically broken. Over time dust accumulates on the fan protection 
cover, preventing hot air from escaping. Applying the latest bios updates helps 
some but it basically just increases the fan's activity. Hiding the actual 
problem behind more noise. Unfortunately this will not work forever and 
eventually the fan will need to be cleaned.
The only solution to this problem (since the Vostro 3700 is out-of-warranty) is 
to manually untie all the screws on the lower part of the laptop until the 
cover comes off. Then you have to untie all screws on the motherboard and flip 
it around. Then use a tiny screwdriver to open the case of the cooler and 
vacuum the inside. Put the entire thing together again afterwards. You'll 
notice right after starting your laptop that the cooling sound is much less 
dull (Is this the right word?) than before.

A step-by-step reference is given here:
http://support.dell.com/support/edocs/systems/vos3700/en/SM/Heatsink.htm
just follow _all_ the guides linked to up to step 12. Now, instead of 
disconnecting the heat sink, open up the fan and clean it. Then do everything 
in reverse to re-assemble your laptop.

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https://bugs.launchpad.net/bugs/689571

Title:
  cpu runs very hot even when idle

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