fan cool, no. If your doing overclocking (which i hope you are) on those cards you will get pretty high temps.. i was hitting about 75c on a moderate overclock with just one card.. 3x cards would push you to the upper 80s at least.
With my waterblock installed on the 980 ti, the max temp i saw...
XSPC, EK, and a few others have made waterblocks for the 980 ti.
Putting a waterblock on a card takes 10 mins tops.. I dont understand why you couldnt just put it on yourself..
Do you send your computer in to get dusted as well??
Tried all the above with a more than qualifies pc and none worked. RMA, sending back to evga under warranty now, let you know if the problem persists or if it really was a gpu issue.