There is suppose to be a pad at the bottom of the heatsink, you didn't remove it did you?My CPU fan came with the CPU and it already had a solution of some sort on the bottom where it touches it. I have one case fan, the CPU fan and the PSU fan. My wires are a bit jumbled up and not too neat at the moment, might that have something to do with it?
PS: Yes it is summer and it gets pretty hot!