Symptom Chart

Symptom	Possible Causes	Action
Air conditioning performance poor or inoperative	Refrigerant undercharged Refrigerant overcharged Thermostatic expansion valve faulty Receiver drier restricted Water in refrigerant	GO to Pinpoint Test A .
Air conditioning operates briefly and then switches off	Electric cooling fan inoperative Air conditioning condenser airflow obstructed	Test the operation of the electric cooling fan Check the air conditioning condenser for external obstructions