Warm Air Comes Out of the Vents, and There Is Frost on the Expansion Valve

Warm air comes out of the vents, and there is frost on the expansion valve

Diagnostic Procedure:

1. Probable cause: The expansion valve is stuck closed

2. Replace the expansion valve Service and Repair

Also check for:

- HVAC DTCs Initial Inspection and Diagnostic Overview
- Check the old expansion valve for contamination. If contaminants are found, replace the A/C system component that caused the contamination.