Kia sportage i just replaced the head gasket on a 2.0 because of pressure in the water side.i checked the head out with magnflux and found no kracks what am i missing.bob

Do not understand, You did the head, but the machine shop inspected the head and cut it on, resurface it, and than you installed a new head, and also You have replaced your thermostat and to finish you have to let all air go of your coolant by running the engine for longer than 20 minutes with radiator or coolant cap off, make sure You torque it from the inside across and expanding zigzag to the ends