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FAN INSTALLaTION In what part of the PC case should I put a cooling fan and how many fans to be able to efficiently cool the interior of my PC?

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  • Anonymous Dec 27, 2008

    i do not understand how to remove the cooling fan from the CPU on a PC. It is very noisy and I want to replace it with a new one. How do I remove the fan?



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You can put the fan anywhere that it fits.  You can never add too many.  I have two added fans in mine. I put one in the front and one on the back (inside) where there are vent holes.  Have the fans blowing in the same direction, towards the rear.  Make sure the fans don't rub on any boards. 


Your computer has one fan in the power supply and/or a small one on the cpu.  You may not need more than that.

Posted on Oct 14, 2007


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3 Answers

How do I remove and replace a CPU cooling fan on my Dell Dimension 2400

Make sure u can open the casing well to expose the interior parts without causing any damage. Then by close look at the processor area , that is where the heat sink is located. Normally the dell dimension 2400 has a green channel shaped structure that acts as a passage for the air that enters in and out for cooling the heat sink. It has a locking parts that slides into the casing back by slight pressing to the back of the casing just behind the processor area, be so observant to notice the locking parts. then the fan is just fixed behind that green " channel like" and its fixed on the rear side of the casing, 25275582-o0cuhlgwrl13okm3u3q5444d-5-0.jpg

Nov 08, 2014 | Dell Dimension 2400 PC Desktop

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Corsair h50

The installation and use of cooling fans in PCs is pretty straightforward once you understand the airflow layout and mechanical assembly.
You need to learn the necessary skills to make sure you are setting up your fans to direct the air where it will do the most good, as well as how to choose (and mount) the correct fan(s) for your situation.

Computer fans are manufactured in five distinct varieties: case fans, expansion-slot fans, hard-drive coolers, CPU fans and external drive-bay fans.
With case fans, there are several physical sizes that are measured in millimeters.
Another measurement the manufacturer will provide is the CFM (Cubic Feet per Minute) the fan is rated for.
As a general rule, the smaller the fan in size and the higher the CFM rating, the more noise it will create.
Before you purchase additional fans, open your case to see what kind of fans can be added.
The fan size must match the size of the opening in the case to be at peak efficiency.
You will need to establish you have expansion slots available if you want to add an expansion slot-style fan.
It is crucial you establish a pathway for the air being moved inside your case to follow.
As an example, having all the fans blowing air from the outside of the case to the inside is not as efficient as having fans on the front of the case blowing cool air in while the fans located in the back of the case are sucking out hot air.
It is recommended the best practice is to position a case fan in the front bottom of your case (bringing in cold air) and at least one fan mounted midway up the rear of your case (expelling hot air).
If possible, use two fans in the back to expel the hot air as a lot of it is being introduced by the CPU cooling fan.

The mounting of case fans is done by using four course-thread screws usually provided with the fan.
These screws are self-tapping and will be inserted through the hole in the case wall created for a case-fan screw, then screwed into the case-fan body mounting hole.
Make sure you use all four screws to hold the fan securely.

The installation of an expansion slot fan can target specific areas where heat is generated.
When mounting one of these fans, make sure the expansion slot fan is not in direct competition with the fan mounted to a video card.
Having the expansion slot fan blowing directly into the video card's fan, which is trying to blow out air, will defeat both of the fans' purpose.
Hard-drive coolers usually mount to the circuit board side of the hard drive and work to keep it cool.
Because of the location of most hard drives, there is very little disturbance from the air that is released from the hard-drive cooler to the airflow pattern mentioned earlier.
External drive bay fans can provide an enormous amount if airflow, assuming there is an external drive bay open.

Jul 28, 2013 | Video Game Consoles & Games

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I have a dell og5611 pc his fan running permanently on high speed hence i have facing heavy noise from fan

Clean the internals with a soft brush. Make sure the power is unplugged first and only use the brush to loosen the dust build up in the case. You can remove the fan and clean it properly out of the case, this will give the fan better efficiency, so it won't have to spin so hard to give the same cooling.

Feb 17, 2013 | Computers & Internet

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Which way does the rear fan go in a compaq computer tower

The proper installation of a CPU fan is often the subject of debate. Though there are conflicting theories as to which direction the CPU fan should face, there are methods to ascertain which CPU fan installation best suits your needs. The determining factors of your CPU fan installation direction include the manufacturer specifications, your case design and the specific design of your heat sink
Horizontal Installation
  • The installation of a CPU fan horizontally to the plane of the motherboard is the most common installation orientation there is. Your options when installing your CPU fan are to blow cool air onto the heat sink or to pull cool air through the heat sink from the motherboard. Horizontal installations show negligible advantages in either installation direction. The differences in temperature usually vary by only 1 or 2 degrees Celsius. The main point to consider when installing a horizontal CPU fan is the location of the rear exhaust fan on the case. If the rear exhaust fan on the case is parallel to the processor, it is advantageous to have the fan pull cool air from the motherboard and push it out above the heat sink. This is because the case fan will quickly draw that hot air away from the CPU and out of the case, allowing for quick cooling.

Vertical Installation
  • Vertical, or tower, heat sinks rise high enough off the motherboard to allow for a fan to be installed perpendicular to the plane of the motherboard. This allows for cooling to go from the front to the back of the case, as opposed to going from the bottom to the top. Optimal installations for vertical heat sinks are blowing toward either the back or the top of the case. If there is no exhaust fan in the top face of your computer's case, it is more effective to orient your fan on your vertical heat sink so that it blows toward the rear exhaust fan of the case. If there is an exhaust fan on the top face of your computer case, it is almost always more effective to mount your CPU fan so that it blows air up toward the top of your case. The reasoning behind this is that hot air rises and will more naturally flow off the top of your case. Also, top-mounted fans are usually larger and allow for faster airflow out of the case.

Manufacturer Recommendations
  • It is often the case with nonstock heat sinks that the manufacturer has designed the heat sink's fan to be mounted in a limited number of orientations. This is usually evidenced by limited mounting notches on the heat sink itself. Most aftermarket heat sinks use technologies such as heat pipes that have specific cooling needs to operate appropriately. Because of this, it is important that in any CPU fan installation you follow the manufacturer's installation instructions.

Performance chips of BMW

May 31, 2012 | Compaq Hp - 375376-001 - Dc7600 Tower...

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After 5 days of installation of a Corsair GS700 power supply and proper performance, my ASIUS/AMD PC just won't turn on any more. A brief flash of leds and then off again.


You do not say if the previous power supply failed or not. If the old PSU burned out, it may have damaged the Power Management System or blown some capacitors on the motherboard.

You do not say if this is a custom-built or factory-built PC.

The issues to check are if anything on or around the motherboard was disturbed during installation.

Start by removing the new PSU and removing the 2nd side panel and shaking the pc side to side to see if any loose screws are lurking under the motherboard or rolling free in the case, potentially shorting the solder points under the motherboard.

Are the motherboard screwholes properly aligned with, seated on and screwed to all the correct mounting points on the motherboard? A misaligned mounting point might short the solder points on the underside of the motherboard.

Are all the RAM modules properly seated? Is the graphics card seated properly? Is the CPU fan connected?

Is the CPU properly seated? Remove the heatsink, clean the CPU and heatsink surfaces, reapply heatsink paste and carefully reseat the Heatsink.

Was the case full of dust, dirt and grime when you changed the PSU? Is there a caked layer of dust between the Heatsink and the heatsink fan?

Are all the cooling fans free of dust and grime and connected properly and are they cooling adequately?

Ideally in a gaming system, a fan should draw cool air low into the front of the case, another fan should draw dispersive cool air into the side of the case, a fan or fans should vent hot air out of the rear of the case. The CPU heatsink fan and power supply fans automatically vent hot air from the CPU and the PSU motor.

Any fans missing should be added to improve and optimize cooling efficiency.

Is there any caked dust and grime between the front panel and the metal chassis of the PC, disrupting airflow sucked in by the front cooling fan?

Are all the cables tidily cable-tied to minimise dust traps, hot air pockets (especially near devices that generate heat like the hard drive(s), optical drive(s) and graphics card and to minimize the restriction of air circulation.

Is the graphics card fan free of dust?

Place the PC on its side. Disconnect the PSU and connect it again starting only with the motherboard connection make sure all 24 pins are oriented correctly. If it is a 2 part connector make sure the 2 parts clip together correctly using the printed guide arrows on the side of the connector. Then connect the CPU power connector, the the HDD power connectors, then the graphics card power connector (if it has one).

Remove the small nickel-sized CMOS battery for 2 minutes then reinstall it, to clear the BIOS from the previous crashes.

Recoonect the power cord.

Then test the PC, leaving it open and flat down so you can easily see all parts of the pc.

If all is well, shut down, disconnect the mains power cord and connect the Optical Drive power connector and all the fans and the test the PC again to see if all the fans work and rotate at the correct speed.

If all is well, shut down, unplug, close the pc, reconnect and power up to test again.

Do not place the PC directly on the floor on a carpet with a thick pile as this can obstruct the inflow of cooling air from the floor-level front air intake. Place the pc on some sorm on platform like a plank of wood or cardbord to leave a cler gap for air to flow in

Hope this helps.

Aug 24, 2011 | CORSAIR 700W Gaming Series GS700 Atx High...

1 Answer

Computer powers on for 10 seconds then shuts off can hear the fan starting then that shuts off could you please email me back with some ideas of the problem would be very grateful

Sounds as though you may have an overheating problem, even though the fan is spinning, it may not be cooling efficiently. Take a look inside the case of your pc (after unplugging from the mains of course) and have a look at the fan for the cpu. If there is a build up of dust around the fan then clear this as well as you can. On most cpu's, the fan can be removed irrelevent of the heatsink which it is cooling. If this is possible, it may make the cleaning easier. Make sure you replace the fan the same way around any try starting the pc again. If the same problem persists, then start the machine with the side casing removed and visually confirm that the fan on the cpu is spinning.

Hope this is some help

May 06, 2011 | Packard Bell Computers & Internet

2 Answers

How do you replace the cooling fan of the Dell dimension 2400 desktop computer?

To replace the cooling fan follow these steps:-

You will notice that replacing the fan is not specifically mentioned, but it should be fairly easy.

Open the case as noted in the instructions, follow the power wire from the fan to the motherboard, then unplug the connector from the motherboard, and remove the assembly.

Some of the earlier fan shrouds just lift up and out, but others have tabs to hold them in.

Regarding the fan, there might be two release levers accessible from inside the case, but the one by the PSU can be hard to reach.

It might easier to push the retaining tabs, in from outside, using a small screwdriver, pen or whatever.

The installation of the new fan, is just a matter of fixing the new one in place and connecting the cable.

Good luck, and do rate the solution if got help

Dec 02, 2010 | Dell Dimension 2400 PC Desktop

2 Answers

2002 jeep grand cherokee larado is over heating. The cooling fanonly runs if I hotwire it. I changed th thermostat. Temp gauge is reading . Could it be the cooling fan relay if so where is it located. The...

Fan relay is located under pass headlight. Remove light assembly, use 2 1/2 " hole saw to drill hole in plastic housing ,3"from back wall, 3'' from left side.This will put you right over relay. Unscrew two bolts,replace. Relay was $40.... dealer wanted$350 to remove front bumper to replace it.

Sep 02, 2010 | 2002 Jeep Grand Cherokee

1 Answer

Model number for the interior cooling fan, for a toshiba laptop

I have found a link to a web site that sells them but they are dear they have the product code also for your fan so you might get one cheaper on ebay or something.

Feb 25, 2010 | Toshiba Satellite A105-S4074 Notebook

2 Answers

Samsung q1 black screen

That would be normal, as the variable speed fan comes on only when the computer is under load.

What is not normal is that the fan is not coming on when the computer overheats.Or that the fan is not cooling enough when computer is overheating.

Monitor computer temperature using a software, check if Fan is coming up when temperature gets critical.

If fan comes up but does not cool enough, then replace the fan, it is not efficient anymore because of a bad bearing or dust. ~Also ensure that fan is well mounted, if fan has poor contact with CPU surface , cooling will be poor.

If fan does not come up, and critical temp is not detected, then the sensor on motherboard is bad, this is very uncommon. When this happens the problem is usually related to system or power settiings , rather than overheating.

If fan does not come up and temp is critical, then fan is faulty, replace it.

There are also more than one fan on many laptops, check that one of the fans (CPU fan, video fan) is not completely ded, and therefore cause for the problem.

By using the software below you can also find out if the problem is really overheating. If temperature results within normal range, then usually it is not overheating.In that case test systtem and check power saving settings.

Here is the software to control your fan and temp. sensor state:

Download SpeedFan - Access temperature sensor in your computer

Download SpeedFan 4.38

SpeedFan - Free software download

Mar 12, 2008 | Samsung Q1 Tablet PC

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