Power Steering Fluid loss

[Denethor]

I'm at a complete loss (pun intended).
Every 3 mo or so, my power steering reservoir is almost empty. I hear it starting to whine before it gets too low and fill it back up. But here is the part I don't get. I can't find a leak anywhere. Never a stain on my driveway nor my parking spot at work (sealed painted floor, you'd see even a drop).
Where is it going? Also every time I take the cap off to fill it up, its pressurized in the tank, you here the pressure escape like opening a beer

 

[Cyclone]

Try running the engine and just turning the wheel from side to side after topping off the fluid. See if it ejected only during the time of use (ie turning the wheel).

 

[1955moose]

An old school trick is to sprinkle baby powder around any possible leak points. The oil will stick to the powder If your losing it, it's got to be leaking somewhere. It's possible your high pressure hose is leaking, but small enough that it only comes out under extreme pressure. Look closely, you'll find your leak. Shops have pressure tools just for this situation. You might have to pay a shop a small diagnosis fee, no shame there, and repair it yourself.

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