n/a ka oil cooler installed, now humming?

[costa_rican13]

Just installed my pbm oil cooler setup on my de, now when the car is on I hear a humming type sound. It's kinda hard to explain the exact sound. But its like a vibrating/humming together sound. Is this normal? Do you have to bleed the setup?? I'm not sure, I imagine not, but it doesn't hurt to ask. Also I have a tiny leak on the block to filter line at the filter plate. Not sure if its the oil leakage making the sound or what. I also put 4 1/2 qts of oil and a k&n filter since I was doing the setup today with stainless steel lines. Anybody have this humming sound? It just started since I installed everything. Thanks for any input!