Macbook Pro Loud Noise Help!?

[ecsong187]

So my MB pro is a late 2008 model.
Randomly when I start up my computer or when I am typing I will get a really loud "whoosh" noise from the left side of my MB. It lasts about a second. it almost sounds like a fan is revving up really high and then it goes away.
Any idea what this could be? It seems to happen at random times.
Thanks

 

[falterego]

I had a similar issues on my 2006 MB when I would shutdown the computer with the system temp being high. It was as if the system remembered the last known temp and tried to compensate with ventilation. It would never happen if I waited for the system to cool down before shutting down. It also never happened when resuming from sleep, no matter what the temperature.

The problem went away when I had the logic board replaced in 2008 to fix a bluetooth issue.

 

[ecsong187]

Yea it's weird. My computer isn't acting up, isn't running slow or anything. But this noise is still freaking me out. I can't figure out what is triggering it because it happens at completely random times.
I hope it isn't the logic board!
Thanks for the reply
-Edwin

 

[Fubar1977]

Maybe have a look at your fan speed in iStat pro or SMC fan-control?

 

[ecsong187]

Thanks Fubar I will dl SMC tonight and see what it tells me.
What speed should my fans be running at?
Thanks for the help
-Edwin