Felicia Diesel head gasket

I had a bottom hose blow due to a faulty rad fan sensor, gauge went in to the red. That was about three weeks ago. i have now noticed a small damp patch under the engine when i leave the car after the twelve mile drive to work. when the engine is hot there is no sign of a leak, but once the engine has cooled a bit a small pool of water collects on the head gasket joint on the right side of the head below where the coolant pipe enters the head. the loss of coolant is minimal and the temperature stays normal. Could this be the head gasket going? If it is, does anyone know what i would be looking at price wise to have it fixed? Its a 1.9 Diesel pickup