Warm Air From Vents, and There Is Frost On The Expansion Valve (With A/C)

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 How To Troubleshoot The Heating and A/C Systems (With A/C)
- Check the old expansion valve for contamination. If contaminants are found, replace the A/C system component that caused the contamination