fan wont kick on when mbp gets hot?

[gt40x4]

My friend has a macbook and when his gets above 150 (or there abouts) his fan turns on to a higher speed. now when my cpu gets hot like 150-160 the fan still stays at idle of the low setting and wont kick into high speed, any reason for that?

thx

 

[Hellhammer]

150F is still normal temperature for todays CPUs when they are under load. When you start hitting 200F, you may have a problem.

To manually change fan speeds, download SmcFanControl

 

[Eidorian]

How long are you waiting? You're not at 200° F either.