Macbook Pro Fan speed

[Jthacher]

Hi,
I have a 13" macbook pro mid 2010 edition and i have been having some problems with the fan. The fan is always at maximum speed. From when I open the lid till 5 seconds after I close it the fan is running non stop. The fan never varies in speed (or sound for that matter) As soon as I hit the power button to turn it on after hours of not using it the fans start up at the same loud speed. It is killing my battery life.
I tried reseting the smc and even the pram but to no avail. I've even searched across several forums but I found nothing that could help my situation.
The funny thing is that when I checked the fan in both smc control and Istat pro, the fan always reads 0rpms.
various information-
4gb ram
320gb standard 5400rpm HD

Its not the fact that the cpu is overworked and overheading because its usualy under 50º C when this is all happening.
If anyone has any ideas of a place I could find some more information or if you have any information please let me know.

Also if theres anything I left out please let me know

 

[IvanLasston]

First thing I found is that the fan may be blocked - even though it is spinning. So Pop open the case and blow everything out with compressed air.

Now what is disconcerting is if the fan is reporting 0 RPMS then you could have a sensor problem.

Now I do have a MBA that seems to run the fan a lot as well. Normal - sitting on a desk seems to run 4400-6000 RPM. I put a laptop cooler at my desk and this seems to help drop the fan RPMs. Usually it run 2000-3000 now with the cooler in place (It will still hit 6k if the CPU is being hit hard)

 

[chscag]

I suspect you have a defective temperature sensor on the logic board that giving out wrong info to the fan control. The fan is therefore running at full speed and since the temperature sensor is messed up, SMCFanControl and Istat can not properly read the RPM. (My guess.) Take it to Apple and have them diagnosis it.

Looks like Ivan beat me to it!

 

[Jthacher]

I took apart the computer cleaned a ball of lint out from under the fan and replaced the fan about a week ago. The thing that confuses me is the fact that all the temperature readings seem to be in check non of them look broken or extreme. they all rise with heavy use like videos and fall with no applications open. Right now all the temps from Hd-cpu are reading just below 40º C and the fans are still going max speed. Im wondering if the fan it in some sort of fail safe mode. The previous fan seemed to do the same thing. It ran until the computer was shut of or put to sleep. It just clicked a lot and the computer ran 10-20º C hotter.

 

[Jthacher]

so I did a hardware test and it came out with the error "4mot/4/40000002: exhaust - 0". Google had nothing for for me but ill keep looking

 

[chscag]

I can't tell for sure, but it looks like it's a temperature sensor or logic error. An Apple tech could tell you one way or another by running their diagnostic software.

Take a look at this Apple Discussion Forum topic which closely resembles the problem you're having: LINK

 

[bursanik]

Macbook Pro Fan speed need hook login

IvanLasston

Hi,
I have same fan speed problem 6200 RPM.
I tried everything I saw on the forums(reset SMC ,PRAM , reassembly and the only thing that works is use terminal commands).
1) Download it setFanSpeed2011.tgz
2) Open the Terminal, go to folder where the file was downloaded
3) Extract it: tar xf setFanSpeed2011.tgz
4) Go to inside extracted folder: cd setFanSpeed2011
5) Run it: sudo ./setFanSpeed XXXX (Where XXXX should be needed RPM)
Problem is not auto start and I must type every time whan i login computer.

I try some smc FanSpeed script comand but I cant make work-loading.(probably wrong script typeing)
I tested speed and 4000 RPM is great for havy load CPU 100%, 3h ( 59-61C max) and very quiet.

I try to creating a login hook but unsuccessful. Iam not expert with terminal.
How can I save and load automaticaly whan login?
Can you somebody help to write right auto login command or login hook or something that will load and put fan speed on 4000 whan star and login computer?

sorry on my bad english.
Thanks

 

[digitalandrei]

Any luck on this problem guys? Been having the same problem after a small liquid spill on my macbook. Cleaned everything up and it seems the liquid didn't reach the board (no residues on it), just the keyboard. All the thermal sensors seem fine and working, normal temperatures in every single one. The only problem is the fan spinning at maximum rpm and smcfancontrol showing 0rpm. Everything else is working just fine...

Could a fan replacement solve this?

ps. don't have apple hardware test disk but i guess it would return that same error, all the symptoms are identical.