Where is the cabin air filter on a 2003 envoy?

On a 2003 GMC Envoy, the cabin air filter is located behind the glove compartment. To access it, you need to open the glove compartment, remove any contents, and then gently squeeze the sides to release it from its hinges. Once the glove compartment is lowered, you should see a cover that can be removed to access the cabin air filter.