I suggest changing the power steering fluid. Use the type of fluid recommended by Chevy. It's in your Owner's Manual. Some older GMs said it's O.K. to use a specific type of auto trans. fluid. Other GMs require Power Steering fluid. Use the correct fluid type. It will make a difference, especially in cold weather. Check a Hayne's or Chilton's book for how to properly drain the fluid from the reservoir, pump and hoses. Usually it's a matter of carefully removing the low-pressure hose and catch the drippings in a container of some kind. Then start the engine, but don't race it. Let run for about a minute while slowly turning the steering wheel. That'll get most of the fluid out. Button the hose back up and use a small hose clamp if you had to butcher the crimp-type clamp to get it off. Refill the reservoir, start the engine, and top off the reservoir as needed. When you've done that, once again slowly turn the steering wheel gently back and forth. You don't need to go 'stop to stop'. Just a full 360 deg. turn each way from center will do. Then check the fluid level again. The low-pressure hose is the one that usually goes from near the bottom of the reservoir into the pump. The high pressure or return hose usually has a stiffer and thicker hose. It also has threaded connections on each end. Do the rest of you "blockheads" generally agree? If you do end up with a slight leak, then remove some fluid from the reservoir using a turkey baster and add a bottle of power steering stop-leak. That will refresh your seals for a while and should (usually does!) stop minor drips.