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NickVittum Top Student
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Fan always on

Probook 4535s
Microsoft Windows 7 (64-bit)

My cooling fan runs constantly, on high speed. The system is not overheating— it is blowing cool air.

 

It's an older unit, but has done this for a long time. Note:

  • It has recently been cleaned and has a new hard drive with a clean intall of its OS
  • The bios item  "run fan constantly when plugged in" is unchecked
  • The fan actually runs constantly whether plugged in or not.

I beleive the issue must be a failed thermostat, but I don't know where that is— is it embedded in the processors?

 

The computer is running beautifully, does what I need, and I can't afford a new one now. But if the thermal unit is in the processors, I believe replacing them (and motherboard?) would be more that the unit is worth. Is there any work-around? Perhaps an aftermarket thermal unit? Or is the existing thermal unit external to the processors and possible to replace by itself?

 

Thanks

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Fan always on

Hi,


Have you updated BIOS to latest version:
http://support.hp.com/in-en/document/c00042629

Here:
http://support.hp.com/us-en/drivers/selfservice/swdetails/hp-probook-4535s-notebook-pc/5098225/swIte...

Thermostat is not spared separately.

Fan,heat sink assembly or motherboard (BIOS) may be at fault here. Since there is no overheating at all, BIOS may be the culprit.


Regards

Visruth
I'm a Volunteer AND I don't work for, nor represent HP


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NickVittum Top Student
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Thanks, I will look into updating the bios.  Are there any problems or dangers involved in doing that that I should be aware of?

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I've linked HP document previously regarding that.

Follow it systematically.

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NickVittum Top Student
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Thanks. Will try it and report back

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Sure. You're welcome.

I'm a Volunteer AND I don't work for, nor represent HP


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NickVittum Top Student
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So, the new BIOS is installed, with no problems.  Probably should have been done long ago anyway.

 

Unfortunately it did not solve the problem. I guess at this point, we have to assume it's a hardware issue, and given the age of the computer, one I'll just have to live with.

 

Thanks again.  —nick

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You're welcome Nick.

Unfortunately in that case it is hardware issue.

Glad to be of any assistance!

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