Warm Air Out of the Vents. Suction Line Is Cool to Warm, and the Discharge Line Is Warm to Hot

Warm air comes out of the vents. The suction line is cool to warm, and the discharge line is warm to hot

Probable cause: The A/C system is low on refrigerant, indicating a possible leak

Do the refrigerant leak check A/C Refrigerant Leak Check and repair any leaks. Recharge the system to specifications A/C System Charging

Also check for

HVAC DTCs Initial Inspection and Diagnostic Overview

Also check for

Add refrigerant oil depending on the part you replaced A/C Refrigerant Oil Replacement (With Climate Control)