low power, loud noise and loosing coolant

[Bellflower]

OK, I was driving down the road around 70. Accelerated to pass a car and suddenly under boost, it souded like a train horn went off under the hood. I only hear the noise when boost hit 5lbs or greater. Seems to be loosing coolant from the from of the motor some where. The noise sounds identical to a train horn and seems to come from the front of the motor. Checked for leaks and couldnt find it. Thinking maybe the intake or something similar. Any Ideas?????

[lamarmathis]

sounds like a intercooler hose what kind of truck do you have?

[special_ed1977]

if you are loosing coolant its likely a head gasket. whats happening is some compression is being lost into the cooling system over pressuring it. the boost increases the compression there by pushing compression past a weak gasket. the noise your hearing could be an intercooler hose just tighten them and see. if its not the coolant cap makes a similar noise when over pressured. if left alone it will get worse and the bearing in your water pump is next.