1994 Ford Taurus SHO Power Sterring Problem

Need help - Installed new Steering rack and pump on 1994 SHO - steering works fine at idle and when engine is cold - after running down the road a few miles the power steering stops working - let the car sit for a while
then start it up and it works fine? Could this be the Variable Control unit device?
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sounds like there is air in the line take your power steering cap off and let it idle for about 5 min this should get the air out
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Since when is a power steering cap air tight?

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