Safe temperature for G5 2.7 dual

Hi,
I'm looking at a G5 2.7 dual tomorrow and need to know what is a safe temperature range, I will check it with istat pro, if there is there a better way of checking can someone let me know?

Look deep underneath for dust and liquid coolant leaking.
Under heavy load is where the concern generally is, hard to test that.
Apple Hardware Test would be a good step.
Like most any processor, the safe thermal range tends to be cooler the better, but to stay below 70*C. Idle is probably in the 35*C area though.
Ambient room temp, location, good air circulation (not confined or blocked).
Look up the reports on G5 Coolant Leaks - and the make of the LCS matters.

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