Well, some laptops do have stock overclocking and support light overclocking.
(The Asus ROG laptop series, has 'turbo boost' for example, as well as a few other brands I can't name off the top of my head)
Other than that though, o1die (as per usual) was dead on.
If the CPU/Shroud fan kicks on, it means that a thermal sensor is working.
Where are you seeing the heat readings?
3rd Party Software?