Fan runs fast all the time

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Phil Stripling - 25 Jul 2006 01:27 GMT

I know there were posts some time ago about fan issues, and I didn't
have one then. Lately, my fan runs at high speed all the time. I've got
a dual 1-GHz G4, running 10.4.7. I don't recall reading about fan
problems in the latest upgrades. Have I maybe got a clog in a vent or
is there a software problem?

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Stephen Adams - 25 Jul 2006 19:45 GMT

>I know there were posts some time ago about fan issues, and I didn't
>have one then. Lately, my fan runs at high speed all the time. I've got
>a dual 1-GHz G4, running 10.4.7. I don't recall reading about fan
>problems in the latest upgrades. Have I maybe got a clog in a vent or
>is there a software problem?

Make sure you clean the intakes for the fans - that can cause airflow
problems. Just open the machine and blow compressed air back through
the vents (so the dust goes *out*). If that doesn't do it, then you
can try something that works for me. I discovered this by trial and
error, but it works every time:

Reset the NVRAM. Do this by booting with the cmd-opt-o-f (open firmware boot)
keys depressed. When you get the Open Firmware prompt, type;

reset nvram
reset all

The system will reboot. Hold down cmd-opt-S to go into single user mode.
When you get the single user prompt, type:

shutdown -h now

This powers off the machine. Turn the power back on and you should be
set.

-Stephen

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Mac Forum / General / Hardware / July 2006

Fan runs fast all the time