Jack the front of car up off ground. Disable ignition or fuel system so the vehicle does not start. Crank engine over while turning steering wheel from lock to lock at a moderately slow speed. After doing this for about 10 to 15 seconds, place it on the full right stop and lock steering wheel. Leave car for a few minutes or until the fuzzy bubbles are out of the reservoir. Do same thing and leave locked to the left. Do this over and over until there is no more air in the system. If it still blows cap off after this bleed provcedure, it is sucking air in through the inner rack seal and the rack needs replced.