Control System Outputs

NOTE: All A/C related tests should be run in an ambient temperature of at least 10 °C (50 °F).

1. Verify the customer concern by operating the system.
2. Visually inspect for obvious signs of mechanical or electrical damage.

Visual Inspection Chart

Mechanical Electrical
Refrigerant (fill level, leakage) fuse(s)
Drive belt damaged Circuit faulty or damaged
Heater control flaps Blower motor
Plug damaged or loose
A/C compressor
Cooling fan

3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4. If the concern is not visually evident, verify the symptom and refer to PDU.