Check around the top case of the power supply, under the LCS - this is the first place to look for any leaking coolant. It might just look like some staining on the metal casing, raised felt lining or a crusty build-up. Chances are for longevity you will one day want to rebuild the LCS with new coolant line, coolant, and O-ring seals.
I was given a Quad G5 and love it, but reckon it's due for a rebuild, not for leaking but I suspect some of the coolant has dried up/gunked up inside, or the pump is dying. It reports a logic board error when I first power it up (assuming it hasn't been used for a couple of weeks), but after ~ 20 minutes and a reboot it reports all is well. I'm assuming that's due to the coolant being more effectively pumped through during this initial "warm-up" phase, for various reasons as noted.
Still, an awesome machine which performs well to this day, try to find as many late PPC apps as you can for it
I was given a Quad G5 and love it, but reckon it's due for a rebuild, not for leaking but I suspect some of the coolant has dried up/gunked up inside, or the pump is dying. It reports a logic board error when I first power it up (assuming it hasn't been used for a couple of weeks), but after ~ 20 minutes and a reboot it reports all is well. I'm assuming that's due to the coolant being more effectively pumped through during this initial "warm-up" phase, for various reasons as noted.
Still, an awesome machine which performs well to this day, try to find as many late PPC apps as you can for it