Where is the orifice tube on a 2001 Chevy Suburban?

The orifice tube on a 2001 Chevy Suburban is located within the A/C system's high-pressure line, typically near the receiver/dryer. It's not externally visible; you'll have to access the lines to see it. It's a small, usually brass, fitting.

Because it's part of the refrigerant lines and buried within the system, you'll likely need to consult a repair manual specific to your vehicle's year and engine for the exact location and any special instructions or cautions before attempting to locate or service it. Working with refrigerant requires special tools and knowledge to avoid injury and environmental damage.