With Climate Control

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 How to Troubleshoot the Climate Control System

Also check for

Add refrigerant oil depending on the part you replaced Service and Repair