Looking for some advice ...power steering 2005 trailblazer.. started out with a leak in I beleive is a return line on driver side, runs down to the cooler. Fixed with a pressure fitting. Now here is where I run into issues the bleeding of the system. I followed all the steps rocking right to left on steering wheel. Pump gurgled air bubbles come up..then nothing. Steering still tight, I have repeated the procedure over and over and keep getting air bubbles. Checked for leaks, no leaks..any advice is appreciated. Thank you