Anyone know why I would have my power steering fluid overflowing? All was fine for 3 weeks without driving it (Driveway statue) and then one hot day it's coming out the cap. With truck sitting idle for 3 weeks, suddenly the fluid is at the top and overflowing.

Did mine without jacking up the axle.

 

The key is to pump the fluid through as many places as possible. The rocking action of the steering wheel pushes fluid into both sides of the power piston inside the gear box. The pumping the brakes pushes fluid to both sides of its power piston. If you really want to get the gear box super clean then yes you will need to jack it up and steer from lock to lock with the engine off and it will pull fluid from the pump and push it into the gear box but also pushing the piston complete cycles empty each chamber completely and refilling as you go from lock to lock. Make sure you cycle from lock to lock slowly. This process takes longer because there is no pump to aid in pushing the fluid but it does empty more of the debris and old fluid than the quick method. But remember this will deal with the steering box and does absolutely nothing for the hydro-booster.