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‎02-16-2017 07:06 AM

HP Recommended
Product: Probook 4535s
Operating System: 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

1 ACCEPTED SOLUTION

Accepted Solutions

‎02-16-2017 07:41 AM

HP Recommended
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

View solution in original post

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7 REPLIES 7

‎02-16-2017 07:41 AM

HP Recommended
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
Was this reply helpful? Yes No

‎02-16-2017 08:05 AM

HP Recommended

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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‎02-16-2017 08:07 AM

HP Recommended

I've linked HP document previously regarding that.

Follow it systematically.

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‎02-16-2017 08:08 AM

HP Recommended

Thanks. Will try it and report back

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‎02-16-2017 08:17 AM

HP Recommended

Sure. You're welcome.

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‎02-16-2017 04:03 PM

HP Recommended

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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‎02-16-2017 05:52 PM

HP Recommended

You're welcome Nick.

Unfortunately in that case it is hardware issue.

Glad to be of any assistance!

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