Well Joe hasn't answered you yet so I guess I will...
Ok the problem with the Heatsink on the block is this. You said yourself that the block is being cooled with (hopefully) room temp water. Which usually places the block at room temp. Now, the inside of the case is being heated up by the air being pulled in through the radiator. Now your blowing that hot air over your heatsink on the block which heats it up and dumps it back in the water. Which goes to the radiator, and gets blown back into the case.
So you've effectively created a nice little oven. You NEVER suck into the case through the radiator. The point is to REMOVE the heat from the case to somewhere else, not dump it back in.
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