1969 Cougar standard coupe power steering problem. I just replaced all the power steering hoses and all the fluid drained out. I did not turn the steering wheel side to side to force the fluid out before I connected the new hoses. I filled the reservoir with new fluid and ran the engine for a few minutes. Went to turn the steering wheel and it started turning back and forth on its own quickly and violently. It also forced fluid up and out of the reservoir refill spout. Help?