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Tech Helproom


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Case fan query


alB*
Resolved

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Fujitsu Siemens Scaleo P computer running Windows XP, just lately I’ve noticed that under heavy load the CPU fan increases speed, not a problem, so I decided to give the innards a good hoovering out. As you would expect there was the usual layer of dust etc especially on the CPU so I gave everything a good clean, on testing I noticed that the small case fan wasn’t working and by the clean look of it I’d say that it hasn’t been working for some time as it was virtually free from dust, my question is, could this be a temperature controlled fan or should it run all the time or could the fan be shot, the motherboard is a Fujitsu P5GD1-FM - Thanks for any help, ...alB

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tigertop2

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I would say it is unlikely to be temperature controlled but if it is connected to the Motherboard try unplugging it and then attaching it again. if it is connected to a 4 pin Molex lead or indeed any other lead from the Power Supply Unit try the same again and if that does not work then try using another PSU lead if you have a spare one

Fans do fail from time to time and are relatively cheap to replace-which may be the best final action

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tigertop2

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I would say it is unlikely to be temperature controlled but if it is connected to the Motherboard try unplugging it and then attaching it again. if it is connected to a 4 pin Molex lead or indeed any other lead from the Power Supply Unit try the same again and if that does not work then try using another PSU lead if you have a spare one

Fans do fail from time to time and are relatively cheap to replace-which may be the best final action

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alB*

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tigertops2, thanks for your reply, the fan is connected to the board with a three pin connector, I had already tried your suggestion of unplugging but to no avail, I think probably you are correct and a new fan is required ...alB

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woodchip

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Three Pins means it is a controlled Fan speed or on off, You could check BIOS for Fan Settings

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alB*

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Thank you both for your help, I bought a new fan for a couple of quid and that doesn't work either so I can only presume that a. it's temperature controlled or b. something is duff on the MB. Can't see anything in the BIOS relating to fan speed, so I think it's a case of leave well alone, Thanks again ...alB

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finerty

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erm did you buy the exact make and spec of the fan?

I suggest you buy the exact make and model and see if that one works.

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Mr Mistoffelees

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I would suggest you get yourself a fan with a 4-pin molex plug that can connect directly to your PSU.

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rdave13

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Or one of these.

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alB*

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finerty, just bought the same size fan so can't say it's exact, I'm going to try the suggestion made by Mr Mistoffelees and rdave13, at least the fan should run constantly then, thanks again for the help ...alB

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rdave13

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alB*, you have two types of connectors, the +12v and +5v. If the fan is noisy at full speed (12v) then change connection to the +5v and it will run at half speed and will be quieter. I run my front (intake) fan at half speed.

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