Working on the G5 quad liquid cooling system

Replacing your G5 pump or pumps with a new N.O.S. Laing DDC-1T from BMaverick:

For anyone wanting to know how to connect the wires from the connector of a new Laing DDC-1T pump, (purchased from BMaverick, AKA-BMav) to the factory G5 connector. Here is the pin-out mapping chart below showing both connectors. I got this from a fellow G5 owner that successfully replaced his pump with a new one from BMaverick.

Note: The BMaverick pump connector has a number "1" on one side of the connector as a reference of where to start the numbering it.

Here's the link again to new BMaverick Laing pumps that will work on the G5 single and duel pump LCS Quad. http://bmaverickddcpumps.wordpress.com/buy-ddc-pumps-here/

Remember to check to see if your original pump has VC (volume compensation) or not. If your pump has VC, you will need to modify the new pump for VC also. You can find those instructions here. http://www.saunalahti.fi/~holindho/g5-quad-v1-lcs-repair-pump.html

G5Lover wrote:

…So how's your G5 running these days? Any heat or fan issues yet?

Don't want to jinx myself—so knock on wood—but, aside from the badly damaged cage during shipping, I really lucked out with this machine in that regard. I just checked the Hardware Monitor menu bar drop-down menu and here's what I saw:

Outdoors temperature just day before yesterday reached 112ºF (44ºC).

Compare that to May 1, 2012:

Ramón,

Regarding your first screen shot; If those core temps. are at idle, with a normal ambient temp of 72º F where the machine is located, I would say that 50ºC - 58ºC is a bit high for a machine at idle or with minimal processes going. However If the ambient temp where the machine is located was 112º F, then I would say that's pretty normal.

Your second screen shot is normal at idle, with normal ambient temp of 72º f at the machine location.

While I was on here typing this up, I did a quick screen shot of my current core temps. Ambient temp where my machine sits is 75ºF right now.

G5Lover wrote:

…I had the performance setting in System Preferences set to "Highest" during this test. Normally, I keep my processor performance setting set at "Automatic."

Are you on Leopard maybe? I don't see those options in my Tiger system.

(I'm too lazy to boot off my optional Leopard OS right now. 😝 )

My "Post" LCS flush-'N-fill Temps & Fan Speeds under a load…

Thought I'd show some temps and fan speeds during some intense rendering and encoding processes in iDVD when I'm burning a movie to a DVD. These temps and fan speeds are pretty much constant during the processing. There were a few high spikes where the temp on the #2 diode of the "B" core rose only as high as 153º and only for a few seconds. I notice that during this process of video rendering the "B" cores seem to remain 10º to 20º warmer than the "A" cores. I'm thinking that the "B" cores are being sent slightly more tasks than the "A"s. At idle there is only a two to three degree difference between any of the four processors.

Anyone know why Hardware Monitor won't detect the second drive I installed in my G5 quad? All other sensors are working and it detects the new drive but says the sensor is disconnected??

Here's a screen shot of the Preferences settings that show the drive but gives me a red warning text that there is no sensor.

Never mind answering my earlier post guys. I figured it out. Apparently the second drive goes to sleep when not being used. That's why Temp Monitor loses the temp data and gives no temp for it.

Here's how I found out what was going on:

I opened a folder on the 2nd drive and there was a delay. That told me that the drive must go to sleep when not used. Once the folder opened, I then exited and restarted Temp Monitor and the drive temp showed up.

I'll be following this thread with great interest given the uncertainty that reigns throughout the net as to the true nature of the pumps.

On a recent thread, romko23 seemed to think that the double pumps meant Delphi and the single pump meant Panasonic. There's not much on the net to show which one is which, and which of the two cooling systems, dual pumps vs. single pump, is the most desirable.

https://discussions.apple.com/thread/3232389?start=0&tstart=0

There has been also contradiuctory advice as the the wisdom of re-doing the thermal paste and of flushung the cooling system. A tech that used to work for Apple (in manufacturing) recently expressed a firm opinion that flushing the system should only be a measure of last resort, when there is no alternative other than discarding the LCS as a whole. It was also his contention that Apple reverted to the Delphi pumps because the Panasonics "did not hold up as long as it had been hoped". The credibility of this particular independent technician tends to be bolstered by the excellent quality of his work but downgraded by his, um, ethical deficit in dealing with customers' credit card information. (That's a whole 'nother, ugly story.)

EDIT: Sorry, I had to correct the link, as the one I inserted initially led to the wrong thread. It is now corrected.

https://discussions.apple.com/thread/3232389?start=0&tstart=0

EDIT: Sorry, I had to correct the link, as the one I inserted initially led to the wrong thread. It is now corrected.

Please note that I edited my previous post, which will not be obvious to those accessing this forum via emal. My bad.

My apologies. The link in my first reply still links to the wrong discussion.

The thread where the controversy of dual vs. single pumps arose is this one:

https://discussions.apple.com/thread/3232389?start=0&tstart=0

My bad.

Nice to read, that i'm on the lucky side with the pump. And i hope it still has a long “life“ to live.

Im a bit puzzeled about the coolant mixture yet. While at some places (including your worklog) a two parts (distilled) water - one part coolant mixture is suggested, in the top post on the other threads last side BMaverick advises to mix two parts of (Sierra) coolant witth one part of 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.“

Which one is the right? 😕

😮 More weirdness:

When logged in to reply, I can reply but then I cannot see any messages after the one quoted below. Not even the ones I just posted.

But when I SIGN OUT, I can see all of them. This is repeatable at while, and happens both with Firefox and with Safari.

LAST MESSAGE I see in this thread when SIGNED IN is this one I'm replying to:

Re: Working on the G5 quad liquid cooling system

Jun 10, 2013 10:51 PM (in response to Ramón G Castañeda)

G5Lover wrote:

Ramón G Castañeda wrote:

Thank you for the clarification.

Fortunately Hardware Monitor keeps a historical curve of the readings.

Ramón

Where did you get Hardware Monitor? Did it come bundled with something? I really like all the different monitor readings you show in your screen shots. I have iStat Pro widget and Temp Monitor program and both of them have software glitches. They also don't show enough settings for my liking.

Hi-

The upper is CPU A.

If you switch CPUs, you need to thermal calibrate with the ASD 2.6.3.

Invaluable reading:

http://www.xlr8yourmac.com/systems/G5_CoolantLeak_Repair/G5_CoolantLeak_Repair.h tml

http://www.xlr8yourmac.com/systems/G5_coolant_leaks.html