If you look at this power steering hose 1 end has two clamps on it. https://www.ecstuning.com/Audi-B5_A4-FWD-V6_12v/ES2453 There appears to be a check valve of some form inside. This hose connects from the cooling line to the reservoir. They call it a return hose. Question is what end is the check valve and attach to. Is it the reservoir or the cooling line I can't find any information on it. Thanks in advance.

 

Issue solved. The answer was right in front of me.... doh.