Power steering xj8 3.2 1999

[Victor1275]

Hi all,
I lost my powersteering a week ago, was gone at once in a turn.
So i replaced the pump today. The powersteering is back but it makes a terrible wining sound when i turn the wheel.
Also after letting it idle for 10 minutes. When i give it some gas and turn the wheel the noise gets even worse.
I completely toped the reservoir up with the correct atf fluid ( atleast the correct fluid according to my autoparts dealer.)
How many air can be in the system. Because it bubbles/foams in the reservoir, even after 10 min while turning the wheel back and forth with the cap open.

Tnx in advance,

Cheers, vic