I'll get this out of the way before the tirade starts,
First mistake, buying Thermaltake water, end of.
Secondly, make sure the thermal paste was applied correctly/is in contact with the Cpu,
And third, is there and knocking type noise at all?
it may be that he has an air bubble in the loop, to try and move it, rotate the Pc on all axis' and see if that helps,
You/He will get blasted for having bought a TT loop, they aren't very good at all and if H'ed posted here asking for a loop/cooler suggestion, he would only have got Xspc, Swiftech and Corsair Hxxx recommendations,
Live and learn though