Cpu Cooling Fan

I have a L645D-s4056. It has been shutting down without warning.  After doing all the heat things, checking the fan, regluing the heat sink, replacing the battery, blowing it out and throughly cleaning it, testing the power cord, resoldering the power connections. We determined the Cpu is getting hot, like the fan was not cooling it properly. However, the computer even when cool and idoling was still shutting down.   I had a diagonotics done on the computer at a local shop. They said the cpu and the mother board test good.   Therefore, leading them to tell me the problem would be with the cpu cooling fan.   I'm now understanding that there is a main fan which is vented out of the side, and the cpu itself has its own fan.    Can anyone verify that this is true?
I also was able to keep it on long enough today to, to use the Toshiba recovery wizard and completely restore it back to factory settings, so all window issues with cooling have now been cleared also.
If this is the case, where is the best place to purchase a cpu fan, and if anyone would be able to supply what the part number might be. I am trying to find a cost, and I am not the person that knows how to take the computer completely apart, so wondering if anyone knows the info.
2nd does anyone have pictures, websites etc as I have seen in this forum previously to provide help with replacing .. and where it is etc.   The person fixing it is knowledgeable but as someone that isn't im trying to provie the most info as I can.
Thank you for your help, info and insight.

Satellite L645D-S4056 Specifications
Satellite L645D-S4056 Downloads
You may find these links useful. You can take it apart to better familiarize yourself with the things alexuw is talking about. But, you can see most of them in the disassembly pictures.
Satellite L645D Disassembly
Satellite L645D-S4056 Partial Parts List
One thing that often causes overheating and shutdowns is using non Toshiba supplied drivers. Especially chipset and graphics/display drivers. Stick with the Toshiba ones.
Mike

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Hi @Psantra ,
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Hello DTCothren,
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I would recommend you open up the hardware diagnostic tool on your computer, and run a full system test. This test does take some time so just allow it to run. If you not sure how to locate the program have a look at this document.
Please respond back at your earliest convenience.
Thanks
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Clicking the 'Accept as Solution' button is a way to let others know which steps helped solve the problem!

Controlling CPU cooling fan and other cooling fans

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I hope I have answered your question to your satisfaction. Thank you for posting on the HP Forums. Have a great day!
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Hello again stylova,
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http://www.hp.com/cgi-bin/hpsupport/index.pl
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I work on behalf of HP
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... or you can hook up the existing cpu fan to one of such devices:
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Hi:
See here --
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I would like to ask a few questions abou my system: first of all, the cooling fan is running in my opinion too often: almost continuously, with brakes of 2-3 seconds. Is this normal?
I have my laptop since august last year and I think it shouldn't be a problem of dust, because it is too "young" for that and I don't live in a "dusty" appartment...
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But the curious thing is that so named "Core" temperature is oscillating from the beginning between 45deg and over 52deg! The fan starts each time the core temperature is rising over 50deg and stops when the temperature reaches 45deg. Is this behaviour normal???
Is the core temperature of 45-50deg normal? I am just using my laptop for Internet browsing, e-mails, etc., no complex 3d games!
The second thing is that the battery life is (and was from the beginning) not spectacular: it lasts max. 1,5 hours with wireless on, but normal use of laptop (not playing dvd's or something like this). Is this normal? If yes, is it because of the amd turion 64x2 processors?
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> I would like to ask a few questions about my system: first of all, the cooling fan is running in my opinion too often: almost continuously, with brakes of 2-3 seconds. Is this normal?
Im an owner of a Satellite A210. Its similar to the A215. The A210 is a European model and the A215 belongs to the US notebook series.
I have noticed the same on my A210 and I think its normal behavior.
> But the curious thing is that so named "Core" temperature is oscillating from the beginning between 45deg and over 52deg! The fan starts each time the core temperature is rising over 50deg and stops when the temperature reaches 45deg. Is this behavior normal???
The CPU temperature of 40-60deg is nothing unusual.
The temperature could arise up to 70-80degrees while playing a game. So dont worry about the temperature.
The cooling modules are controlled by BIOS. The fan table is stored in the BIOS and it contains informations about temperature limits and the cooling usage.
If a certain temperature level was reached the cooling module starts to rotate with a certain speed.
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Problem with motherboard and cpu cooler

First of all , hello.
Let me present my current pc.
Mainboard - MSI 880GM-E41
CPu - Amd phenom x2 560 black - unlocked to quad
Ram - 4 gb kingmax DDR 3
Video - Gainward GTS 450 512 DDR 5
Hdd - Western Digital 640 GB
Power suply - Sirtech 400 W
Now the problem.I bought a Scythe Katana 3 cooler because i couldnt stand the noise from AMD stock cooler anymore.
The cooler RPM in idle/load / full load is 2800 RPM (maximum !) Shoudnt the mainboard set the cooler's rotation to match the processor current usage ? My cooler stand in maximum rotations every single time.
Note that my temperatures are excelent.
I took a look in Bios and could find much.
H/W Monitor
Cooler - 4 pins selected
Smart fan target - disabled selected.Guess this is the automatic option.I dont wanna set it to manual in order to give some values.
Amd cool and quiet - enabled (tried it with disabled too , same deal)
C1E support - enabled.
Would updating my bios to lasted available solve this problem ? I wanted to do that but i wonder if updating the bios would interfere with my unlock of the processor's cores.
Thanks you very much.

Yes , it is
I dont actualy have an "enabled" option....just disabled or some values.
I heard from a friend that :
Smart Fan Target - the critical temperature from which the fan starts to grow in rotations
Cpu Min.Fan Speed - the desired rotations per minute in idle
Is this correct ?
Im thinking about
First - 45
Second - dont know....i have to test with different values.

Kernel Task Causing High CPU and Fan to Run all the time

Hello,
Recently I have had a problem with my computer running really slow, the CPU is running at almost 100% and the fan wont shut off. Please help its effecting my school work. Below is my EtreCheck.
Thanks.
Problem description:
CPU is up to full usage most of the time and fan won’t stop running. Computer running really slow.
EtreCheck version: 2.1.8 (121)
Report generated March 25, 2015 at 2:34:01 PM PDT
Download EtreCheck from http://etresoft.com/etrecheck
Click the [Click for support] links for help with non-Apple products.
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    iTunesHelper    UNKNOWN Hidden (missing value)
    readerAppHelper    Application Hidden (/Applications/Reader.app/Contents/Resources/readerAppHelper.app)
    uTorrent    Application (/Applications/uTorrent.app)
    Spotify    UNKNOWN (missing value)
    Google Chrome    Application Hidden (/Applications/Google Chrome.app)
Internet Plug-ins: ℹ️
    FlashPlayer-10.6: Version: 16.0.0.305 - SDK 10.6 [Click for support]
    DivX Web Player: Version: 3.2.4.1250 - SDK 10.6 [Click for support]
    Flash Player: Version: 16.0.0.305 - SDK 10.6 Outdated! Update
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Time Machine: ℹ️
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Top Processes by CPU: ℹ️
         5%    WindowServer
         2%    Activity Monitor
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         1%    AppleSpell
         0%    ps
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    86 MB    Finder
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    885 MB    Inactive RAM
    1.04 GB    Wired RAM
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    Mar 25, 2015, 02:06:37 PM    Self test - passed
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The kernel is using excessive processor cycles. Below are some possible causes for the condition.
Throttling
When it gets high temperature readings from the hardware, or low voltage readings from the battery of a MacBook, the kernel may try to compensate by interrupting the processor(s) to slow them down and reduce power consumption. This condition can be due to:
☞ a buildup of dust on the logic board
☞ high ambient temperature
☞ a worn-out or faulty battery in a portable
☞ the malfunction of a cooling fan, a temperature sensor, a voltage sensor, or some other internal component
Note that if the problem is caused by a sensor, there may be no actual overheating or undervoltage.
If the computer is portable, test with and without the AC adapter connected. If kernel_task hogs the processor only on AC power, charging is causing the machine to heat up. That behavior may be normal for some models. CPU usage should drop when charging is complete.
Apple Diagnostics or the Apple Hardware Test, though not very reliable, is sometimes able to detect a fault. For more thorough hardware testing, make a "Genius" appointment at an Apple Store, or go to another authorized service provider.
If nothing is wrong with the hardware, then whatever you can do to improve cooling may help.
Installed software
User-installed software that includes a device driver or other kernel code may thrash the kernel. That category includes virtualization software, such as Parallels and VMware, as well as most commercial "anti-virus" products. Some system-monitoring applications, such as "iStat," can also contribute to the problem. You can test for this possibility by completely disabling or removing the software according to the developer's instructions, or starting in safe mode. Note, however, that disabling a system modification without removing it or testing in safe mode may not be as easy as you think.
Corrupt NVRAM or SMC data
Sometimes the problem is cleared up by resetting the NVRAM or the SMC.
External display
Connecting an external LCD display to some MacBook Pro models while the lid is open may cause this issue. If applicable, test by closing the lid or disconnecting the display. You might get better results with a newer LED display.

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