Having problems with your Dell (6F858) Cooling Fan ?

I have a dell Dimension 8400. The cooling fan

\015 I have a dell Dimension 8400. The cooling fan comes on full even though there does not seem to be very much heat John\015

Answers :

\015\012Your fan speeds up and slows down in response to temperature inside the computer. More so the CPU.

I would suggest getting a can of compressed air made for computers

take it outside, take of the side and blow all the gunk out of there, Really go to town around the fan (you might want to wear eye protection)
While you are in there just check that the CPU cooler itself is not loose

If it is it will have to be re-seated.

If it needs re-seating don't just take it off and put it back on as that might make things worse with your temperature problem they have to be cleaned and new thermal grease put on ($2-5)

DON'T remove the CPU just the fan/cooler assembly.

You must clean both the surfaces without scraping anything off. Use isopropynol alcohol and cotton bud sticks until both surfaces are clean, you can use your finger nail to scrape harder residue if you wish but nothing else.

DON'T pour the alcohol over the CPU

Now apply some new thermal grease (most computer shops have it)
Be careful about how much you put on
Here are
some basic instructions
\015\012Your cpu might be getting too hot...
\015\012If you have not done so, it would be a good idea to get some quality thermal compound,such as Arctic Silver, and carefully remove your heatsink/fan, clean the surface of your cpu, and the bottom of the heat sink, and re apply an even, thin coat of thermal paste. Reattach the heatsink/fan assembly, and reboot the computer. On start up, enter the BIOS and check the hardware monitor to see what the cpu temp is..Hopefully you will have it running cooler than it was.

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