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Antec 902 cooling delima

Discussion in 'Antec' started by Colonel, Sep 22, 2011.

  1. Colonel

    Colonel New Member

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    Hi,
    Tonight I noticed that the top exhaust fan is actually sucking air in. When I remove the side panel it blows out, like it should.

    I have added an Antec 3 speed 120mm case fan , identical to the ones installed in the front of the 902, in the side panel.
    [h=1][/h]Have I created an unbalance in the air pressure and this is causing the top fan to intake rather than exhaust? Im kind of lost here , any ideas would be appreciated.

    Thanks in advance!

     
  2. Eternalchaos

    Eternalchaos Unlocked Multiplier Forum Mod

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    Get a small bit of paper (I use a rizla) and put it over your fan to check the air flow, sometimes with powerful fans the air being sucked in can feel like it is going out

    [​IMG]
     
  3. Colonel

    Colonel New Member

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    This is actually what made me notice the problem.There was a receipt laying on top of the 200mm fan. I remember when I first got this case it would have tossed that thin paper 2 ft in the air. If I remove the side panel, front or back, the paper goes flying away...side panels on it will not move.

    Ive tried turning the front and side fans on low but theres no difference.Only when side panels are removed.

    Thanks for your reply
     
  4. ryandigweed

    ryandigweed Member

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    Stupid question, but Are you sure you don't have the case fan facing in the wrong direction? and are there any breaks inbetween the wires? (maybe somewhere near the side panel when you open or close) because when the wires intertween if they're damaged, that could effect the negative/postive of the DC current. It could cause the fan to act silly.

    Is your side pannel fan working?
     
  5. Colonel

    Colonel New Member

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    thanks for the response,

    yes all fans are working correctly and blowing the right direction

    top out, back out, 2 fronts in, and side panel in

    like i mentioned the top fan will float paper to the ceiling when the side panel is off...but when the side panel with fan blowing into the case is on, the top fan sucks air in...It almost acts like theres more air entering than exiting.

    I dont know a lot about positive and negative air pressure but I believe that internal case pressure is causing the problem, just not sure how to fix it...other than removing the side panel fan (not an option with my high gpu temps)
     
  6. ryandigweed

    ryandigweed Member

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    Damn, by negative and postive, i meant the electric current of the wires. I don't know about positive/negative air pressure either. I'm afraid the best and quickest fix is to disconnect the side fan (as you suggested). Are your rear fans working? Check the temperatures when the side fan is on, and check it when it's off, so you can analyze what's best for the CPU.

    Like i said, are there any wires getting jammed in the side pannel when you put it on?. is your side pannel giving slight current when you place an electric current tester screw driver on the surface?

    Have you tried contacting antec support regarding this matter, or any other antec users. I'm using a normal case, i with rear, and side fans. all of them seem to be blowing air in the right direction, but then again my side pannel is completely open, so there's no air vaccum or different air pressures.
     
  7. Colonel

    Colonel New Member

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    oops... didn't mean to make you think i was confused lol

    I follow what you're saying about the reverse polarity of the side panel fan (or any fan for that matter)

    The way I have my wire management I do not believe there is or ever was a chance for the wire to get pinched or damaged. Also I have swapped out a total of 3 fans in the side panel to eliminate a faulty fan and/or wiring.

    I didn't mean to throw negative/positive air pressure and voltage in to the crock-pot in the previous reply..I should have been more clear lol

    I haven't tried any other forums or direct contact with Antec...actually forgot about this post until you replied :)


    The only temp fluctuation I worry about with out the side fan is the gpu....cpu stays around the same temp with or with out it...Gpu temps drop a good bit with the fan in. It just seems I am taking 2 steps forward to go backwards 2 steps ....a tug of war with the fans.

    You would think adding the side fan would drop the over all case,cpu and gpu temps but with it causing a vacuum like effect Im breaking even...maybe my theories on cooling are more wrong than I thought haha
     
  8. grumpydaddy

    grumpydaddy Forum Mod

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    I have the 900 and the one thing it does is collect dust. my top fan is siezed and needs taking out and oiling just now but before with 2 fans in front and another in side that were all antec tri cools on full speed they would pump plenty of air in to be extracted by the rear and the top fans. If yours has filters then check them otherwise get a piece of a4 paper and see if it will get held on the intakes by the fans or blown from the extract (with the side off) then repeat with side on and let us know what happened.

    EDIT: Dont forget to test the side fan with the paper too
     
  9. Colonel

    Colonel New Member

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    all filters are clean, clean them regularly..as you obviously know these things can grow cats inside them with the fans on high :)

    Side panel on paper test:

    side panel fan holds paper to fan
    front fans hold paper to fan(s)
    top fan holds paper to fan
    back fan blows paper away

    Panel off test:

    Front fans hold paper to fan
    Rear fan blows paper away
    Top fan blows paper away


    i can lay a receipt on the top fan and it will not move...if i even slightly move the side panel the paper shoots towards the ceiling
     
  10. laurencehowe

    laurencehowe New Member

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    I used to have a Antec 900, now on a Fractal Design XL (which is an amazing case) and I've gotta say that the case is a dust magnet.

    I found it was best to NOT have a fan on the side, otherwise it disrupts the airflow.

    In theory, as long as you have more fans INTAKING air than those exausting, you will have positive air pressure which means dust SHOULD be kept out more. In theory. I still have to hoover the damn thing once a month, and do a full clean out every 2 months.
     
  11. ryandigweed

    ryandigweed Member

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    Yeah i think the side panel fan is disrupting the flow. I dislike meshed chassis for the reason that it gets really dusty fast. (especially where i live)
     
  12. Colonel

    Colonel New Member

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    Exactly what I wasnt hoping, but it is obviously true.... I would run with out it if it didnt greatly improve the gpu temps... thanks for all the input
     
  13. grumpydaddy

    grumpydaddy Forum Mod

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    Is top fan on full speed?
     
  14. Colonel

    Colonel New Member

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    yes, i leave it on high and set the 2 in the front and one in side on high while gaming

    however i just tested turning all fans on low with top on high and no difference

    tried as many variations of fan speeds as i could come up with and still the top fan only blows out with side panel off

    even with the side fan on low and the rest on high there's no difference. I will give the case my monthly deep clean tomorrow and play with the fan speeds again and see if theres any change with or with out the side fan not installed
     
  15. ryandigweed

    ryandigweed Member

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    Any changes?
     
  16. Colonel

    Colonel New Member

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    sorry been super busy, havent had a chance to clean it up...will post back asap
     
  17. Colonel

    Colonel New Member

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    ok...not my typical OCD cleaning job, but pulled all the filters and cleaned them the fans and hit the interior case with a few shots of air...

    no difference with side fan in or out...huge difference with side panel off, just as before

    I did,out of total randomness, toss an extra fan in to the hard drive cage fan slot and the top fan is actually blowing out now...not like it does with the side panel removed but there is a massive difference than before with the panel on
    I am close to chalking this up to an WTF and dealing with it until I can afford a newer case...this one is great but waaayy too hard to keep clean
     
  18. Passan

    Passan Active Member

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    I am not familiar with this particular case, but maybe you could try slapping in a 120mm fan on the inside of the case near the HDD cage facing the GPU to lower temps?
     
  19. ryandigweed

    ryandigweed Member

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    Good to hear that there is some improvements. Man i hate dusty cases, :( even mine is dusty :( Atleast you're getting proper ventillation. Is the hard disk cage the front fan?
     
  20. Colonel

    Colonel New Member

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    there are 2 fans in the front of the case that draw air in over the hd cages...there is an optional spot for a fan in the rear of the hd cages as well. so basically now there is 1 front case fan pushing air into the optional fan (midcase) which is then pushing air on the gpu. I will try to draw a pic or post pics incase I have lost anyone lol
     

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