Crazy fan speeds

[Hisdem]

Hi all. I just did a fresh install of Lion in my machine, after using SL for about 3 days again. The objective behind this was to try and fix my crazy fans, which, since upgrading to Lion, will run at ridiculously high speeds, even if I am just using 3% of the CPU, and at a temperature below 50C.

I have tried SMC and PRAM resets, cleaning the fans, and nothing. This seems to be a glitch in Lion. Has anyone else suffered from the same problem? If so, did you manage to fix it?

Here's a screen from iStat Pro:

Another note is that my fan speeds no longer increase on a scale, they just boom from 2000 to 6500RPM in a second, and stay there for a while, and then go back to normal. This happens even when I'm not running absolutely anything. Just watching my desktop.

 

[JronMasteR]

That's strange. A SMC reset usually fixes these kind of issues. Have you installed SMC fancontrol or something similar?

 

[Hisdem]

That's strange. A SMC reset usually fixes these kind of issues. Have you installed SMC fancontrol or something similar?

Not using any SMC control software... At least not that I know of.

I don't really care too much about the fan noise, but the main issue is that my laptop is nearly useless as a laptop because the battery won't last an hour with the fans running at max speed the whole time...

 

[thundersteele]

So they work properly when using SL?

Did you completely wipe your system before installing Lion?

 

[Hisdem]

So they work properly when using SL?

Did you completely wipe your system before installing Lion?

Positive. Deleted everything but my iTunes library. Actually, I deleted it too, and then imported only it back from my TM backup. The rest was all freshly installed. I will take the computer tomorrow to Apple, but I'm still wondering if I should try another 100% fresh install.

 

[GuitarG20]

Positive. Deleted everything but my iTunes library. Actually, I deleted it too, and then imported only it back from my TM backup. The rest was all freshly installed. I will take the computer tomorrow to Apple, but I'm still wondering if I should try another 100% fresh install.

i would just go ahead and take it to apple.

 

[Hisdem]

Left the computer at Apple service today. Problem seems to be a busted sensor. Which will mean that I will end up needing a new logic board. Depending on cost, I might replace it. Still, I was (and still am) very pleased with my MBP.

 

[thundersteele]

Left the computer at Apple service today. Problem seems to be a busted sensor. Which will mean that I will end up needing a new logic board. Depending on cost, I might replace it. Still, I was (and still am) very pleased with my MBP.

Ah, that's annoying. Big cost to fix a small problem probably.