As a stopgap how about blowing it out. The little screw in gadget is only 6$ most places and there are plendy out there. Maybe borrow a compressor if needed. Or this would be a good chance to buy one?????? LOL 40 psi max.
I run red through and then blow it out a second time time to pick up any stray water in the lines.
2017 SLX 195RB
2014 Jeep Grand Cherokee Overland, gas 3.7 V6
Andersen WDH hitch
Dometic Milenco Aero mirrors