Do your DL360 G5 upgrade to latest BIOS and iLO?
And on my know, it using FBDIMM not general DDR2 ram, FB is more hot than general DDR without FB, it is why all FBDIMM you see have a heatseat outlook.
I am using DL360 G5 and just bought few days ago (2nd for my personal using on my company for virtual lab test etc).
Same case like your, the iLO2 fans never rotor higher than 40% ...
But my server room is keep at 22C. The hot on my DL360 G5 still okay when I touch it.