My car needs new power steering, radiator, and AT fluid. The shop I work at has a flushing machine for each one, but after searching up these things, the forum says not to flush and to just drain and fill. I used the machine today on a CRV and it doesn't seem like it compresses air or forces fluid in via pressure. The machine doesn't even get turned on. We turn on the car and let the car cycle the fluid through the machine and used genuine Honda ATF. So should I flush or drain and fill?