Dan Lempesis (Omega)

Q: Quad G5 Liquid Cooling System overhaul help

So, since my Lenovo Core 2 Duo died (worthless computer..), I've been without a laptop. This also means I'm using my Beige G3 for all my internet and computing needs.

 

I suppose that might be fine if everything out there (the internet included, and perhaps especially) weren't horribly-programmed bloatware.

 

Anyway, a few months ago I got a Quad G5 off eBay for $150, As-Is. What turned out to be wrong with it is that the LCS needs to be overhauled; unless I run it in "Reduced" mode in Energy Saver, it crashes within ten to fifteen seconds of use at full speed, after hitting over 200F.

 

Only problem is, I"m not quite sure what tools I need.

 

It's a Quad G5, with the Delphi LCS block. Can anyone link me to EXACTLY what tools I need to take the thing apart? I know I need some sort of Hex screws and torx screws, but do NOT know what size. I know I need O-Rings, but don't know how to meausre them exactly, so I don't know what size I'd need. I *DO* know what kind of coolant to use... I don't really know what sort of tubing to buy.

 

Please help? I really like the Quad, it's very fast... and that's at literally 1/2 speed. But I certainly can't justify upgrading it yet without being able to use it at 2.5 GHz instead of 1.25.

 

Help is much appreciated. Again, what I need is the specs of tools I need, quite preferably links to exactly what I need. I know XLR8YourMac etc. have done a lot of detailed guides on this, but they weren't on Quad G5s, and AFAIK the tools necessary are slightly different for a Quad. Thanks!

PowerMac, Mac OS X (10.5.8), Quad G5, 1.5 GB RAM, 750 GB, 7800GT

Posted on Oct 3, 2011 8:32 AM

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Q: Quad G5 Liquid Cooling System overhaul help

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  • by BMaverick,

    BMaverick BMaverick Nov 7, 2011 11:10 AM in response to BDAqua
    Level 1 (10 points)
    Nov 7, 2011 11:10 AM in response to BDAqua

    QUOTING: BDAqua   "I think you can use regulat Anti-Freeze/water mixture."

     

     

    Nope.  The regular EG coolant will have issues with the residue of the old harsh saline coolant that was originally used.

     

    Your only hope is Sierra Propylene Glycol that has the required corrosion inhibitors and using Distilled Water.

     

    Being that the LCS is a mixed metal loop, the ratio of the coolant is 66%PG and 33%DW.  Or 2/3rd to 1/3rd mixture.

  • by BDAqua,

    BDAqua BDAqua Nov 7, 2011 11:32 AM in response to BMaverick
    Level 10 (123,765 points)
    Nov 7, 2011 11:32 AM in response to BMaverick

    Thanks for the info!

  • by Heikki Lindholm,

    Heikki Lindholm Heikki Lindholm Nov 8, 2011 12:23 PM in response to BMaverick
    Level 1 (135 points)
    Nov 8, 2011 12:23 PM in response to BMaverick

    According to the MSDS the Delphi A2 coolant in the OP's Quad is 80% DI water 15% propylene glycol. That doesn't sound very harsh.

  • by Ramón G Castañeda,

    Ramón G Castañeda Ramón G Castañeda Nov 8, 2011 12:34 PM in response to Heikki Lindholm
    Level 4 (1,468 points)
    Desktops
    Nov 8, 2011 12:34 PM in response to Heikki Lindholm

    What's the remaining 5% ?  

  • by BMaverick,

    BMaverick BMaverick Nov 9, 2011 5:51 AM in response to Heikki Lindholm
    Level 1 (10 points)
    Nov 9, 2011 5:51 AM in response to Heikki Lindholm

    QUOTING: Heikki Lindholm "According to the MSDS the Delphi A2 coolant in the OP's Quad is 80% DI water 15% propylene glycol. That doesn't sound very harsh."

     

     

    My reference is with the A1 coolant, the first type used. That was the harsh coolant.

     

    QUOTING: Ramón G Castañeda "What's the remaining 5% ?"

     

    The remaining 5% is more proprietary corrosion inhibitors for the A2 coolant.  Thus, my remarks to use the Sierra PG at 33% to 66% DI or DW or RO if neither can be had.  You have no idea what the other inhibitors actually are nor where to obtain them.

     

    If a rebuilt loop uses 80% DW with 15% PG, they will indeed run into trouble.  The second gen-LCS micro-channels will gunk up in time with corrosion.  This is the reason when some of the threads here are talking about water-blocks having a higher heat load vs. the other one in the loop.  In some cases up to 50%.  The Sierra PG coolant had been tested extensively in the G5 LCS development and proven to be a good solution.

  • by Ramón G Castañeda,

    Ramón G Castañeda Ramón G Castañeda Nov 9, 2011 9:50 AM in response to BMaverick
    Level 4 (1,468 points)
    Desktops
    Nov 9, 2011 9:50 AM in response to BMaverick

    Thanks for the thorough elaboration.

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