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