Where is the air conditioner drain plug on a 2003 Chevy Venture?

There isn't a drain plug on the air conditioner evaporator core in a 2003 Chevy Venture (or most vehicles for that matter). The condensate drain is a small tube or hose that exits the evaporator housing and drains into a tray under the vehicle. It's not something you'd typically access with a plug.

If your Venture's air conditioner is having drainage problems (e.g., water leaking inside the vehicle), the issue is likely a clogged drain line. You'll need to locate this drain line – it's usually a small hose exiting the passenger-side firewall area, near the blower motor, and running down into the floor and out of the vehicle. The solution is usually to clear the blockage, rather than accessing a drain plug. You might need a shop vacuum or compressed air to clear the clog.