Z Book 15 G2 Fan runs constantly?

[Tricky-Dicky]

Any ideas on a fix? My fan has suddenly started to run fast, and continuously CPU load is low and i cannot see any processes that would cause this, would it be a simple case of replacing the fan and heat sink or is there something else going on?

And I cannot download or instal the HP or any other fan control program/utility and have it work?

[TzortzisG]

Hello Tricky-Dicky.

How are your laptop's temperatures? If the fan on your old laptop has suddenly started to run when not needed (based on CPU load) and at high speeds, two are the most common causes:

1) Temps are high for other reasons. The thermal paste job on your CPU has gotten old or the heatsink is not making good contact and the processor is overheating even when idle, something on your motherboard is producing a lot of heat, or even the storage. You have to monitor temperatures and see that the fan is running full throttle even though your laptop is cool..... This is a link to HWiNFO's download page. I usually choose the Portable version.

2) A sensor has gone bad. If this happens, the fan runs full speed anyways. If this is the case, the only way to fix it is by changing the motherboard. The monitoring software should give you some idea of whether there's something wrong with any sensor or everything is functioning as it should.

It's possible to control fan speed on old HP laptops with a third party program called Notebook Fan Control. It has an appropriate profile for your laptop, but to make it work on Windows11 is quite a challenge. Here is a post with the necessary information: https://h30434.www3.hp.com/t5/Business-Notebooks/HP-G9-Firefly-LOUD-FAN-almost-always-running/m-p/84.... The second and last part of the post are the ones that interest you.