I had a full pressure stream of water until impeler sheared the tips off. Had local marina replace impeler now I have very little water and alot of steam. I have taking it back twice and the say it is ok that it is pumping enough water. They took it out for a mile trip with a heat gauge on it and said it ran 140 degrees constant temp and this was a good reading. I think they are full of it. Should it blow steam out intermitently?