Where is the heater valve in a 1994 Chevy Suburban?

The heater valve in a 1994 Chevy Suburban is located behind the glove box. To access it, you'll likely need to remove or at least partially remove the glove box itself. It's often a relatively small, usually vacuum-operated valve. However, some models might use a different setup, so confirming this location with a repair manual specific to your Suburban's engine (e.g., 5.7L, 6.5L diesel, etc.) is recommended.