Insufficient Cooling "Quick Check" Procedure

Perform the following "hand-feel" procedure to get a quick idea of whether the A/C system has the proper charge of Refrigerant-134a. The air temperature must be above 21 °C (70 °F) for most models.
1. Warm up the engine. Run the engine at idle.
2. Open the hood and all the doors.
3. Turn the A/C ON.
4. Set the temperature control knob to the full cold.
5. Set the blower speed switch on the maximum speed setting.
6. "Hand-feel" the temperature of the evaporator outlet pipe. The pipe should be cold.
7. Check for other problems.
8. Leak check the system. If a leak is found, discharge the system and repair the leak as required. After completing the repair, evacuate the system and charge it.
9. If no leak is found, see "Insufficient Cooling Diagnosis".