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G5 LCS rebuild service?

Posted by: HappySausageDog on 2026-07-25 22:22:13

I have a G5 Quad with what I believe to be a gummed up LCS. Work and family and travel for work mean I do not have the time (not to mention, the tools) to rebuild the LCS but I would like to get the G5 working. Is anyone here able to, for a price, able to rebuild the loop? It's a Delphi unit BTW.

Posted by: cheesestraws on 2026-07-26 01:55:47

Where?

Posted by: imactheknife on 2026-07-26 11:58:45

I have a G5 Quad with what I believe to be a gummed up LCS. Work and family and travel for work mean I do not have the time (not to mention, the tools) to rebuild the LCS but I would like to get the G5 working. Is anyone here able to, for a price, able to rebuild the loop? It's a Delphi unit BTW.

I aircooled my quad, g5 dual 2.7 and dual 2.5. Dont miss the lcs.

Posted by: Byrd on 2026-07-26 18:01:46

Hi,

Unfortunately rebuilding the LCS of a G5 isn't something that's predictable or easy to send off for for rebuild. It's not just evaporated coolant but also excessive corrosion in the blocks and radiator (neither are particularly salvageable past this point), failed pumps are another secondary issue. In short you probably need to pull it out and inspect it yourself for failure points before hand.

Posted by: HappySausageDog on 2026-07-29 09:42:52

Where?

NYC area.

Posted by: HappySausageDog on 2026-07-29 09:44:08

I aircooled my quad, g5 dual 2.7 and dual 2.5. Dont miss the lcs.

I get the simplicity, but seeing as there is exactly one liquid cooled Mac, I'd like to stick with it.

Posted by: HappySausageDog on 2026-07-29 09:46:18

Hi,

Unfortunately rebuilding the LCS of a G5 isn't something that's predictable or easy to send off for for rebuild. It's not just evaporated coolant but also excessive corrosion in the blocks and radiator (neither are particularly salvageable past this point), failed pumps are another secondary issue. In short you probably need to pull it out and inspect it yourself for failure points before hand.

That all makes sense. I'm thinking the coolant has crystallized (thankfully there are no leaks in the case) - it's pretty common with Dexcool and improperly maintained car radiators - this is effectively a scaled down car radiator! I did not realize the blocks could suffer from corrosion, too.

Posted by: alectrona6400 on 2026-07-29 18:42:53

i actually did an air cooling mod on mine. you can see more info here:

Comprehensive Guide to Converting G5 Quad to Air Cooling

Hello All, As promised, I have been documenting everything as I have gone through the process of converting my Power Mac G5 Quad from Liquid Cooling to Air Cooling. The results were richly satisfying: all four CPUs idling in the high 30 C area, all CPU fans running at their default low idle...

forums.macrumors.com

Posted by: HappySausageDog on 2026-10-02 08:06:41

i actually did an air cooling mod on mine. you can see more info here:

Comprehensive Guide to Converting G5 Quad to Air Cooling

Hello All, As promised, I have been documenting everything as I have gone through the process of converting my Power Mac G5 Quad from Liquid Cooling to Air Cooling. The results were richly satisfying: all four CPUs idling in the high 30 C area, all CPU fans running at their default low idle...

forums.macrumors.com

I get the utility of air cooling but a big part of the appeal here is the LCS.