Where is the drain plug for power steering pump on 1997 Chevy truck?

There isn't a drain plug on the power steering pump itself for a 1997 Chevy truck (or most vehicles). The power steering pump's reservoir is typically drained by removing the return line, or in some cases, by siphoning the fluid out through the reservoir's fill opening. You'll likely need to loosen the line connection to drain the fluid from the pump's internal passages.

Before you attempt any work:

* Consult a repair manual: A repair manual specific to your 1997 Chevy truck (year, engine, model are crucial) will show you the exact location of the lines and give you the correct procedure. This is the safest way to avoid mistakes.

* Wear safety glasses and gloves: Power steering fluid is messy and can be irritating to the skin and eyes.

* Support the vehicle properly: Make sure the truck is safely jacked up and supported on jack stands before working underneath it.

In short, you don't drain the pump itself; you drain the system. Using a repair manual to guide you is strongly recommended.