Closing one or more outlets may adversely affect the operation of the Automatic
HVAC system. Closed outlets reduce airflow and may negatively impact the ability of
the system to maintain the desired settings. Where possible, always operate the
system with all outlets open, and ensure non-adjustable outlets are unobstructed.
Inspect for aftermarket devices which may affect the operation of the HVAC System.
Inspect the easily accessible or visible system components for obvious damage or conditions
which may cause the symptom.
Verify the A/C compressor turns freely and is not seized.
Verify that the customer is using the correct key to enable personalization and is not
inadvertently activating auxiliary HVAC controls.
The A/C compressor will not operate in cold outside air temperatures.
The following conditions may cause window fogging:
– Wet carpet or mats
– High humidity
– Interior water leak
– Blocked A/C evaporator drain tube
– Maximum passenger capacity
– Blocked body pressure relief valves
Inspect the air distribution system for causes of reduced air flow:
– Obstructed or dirty passenger compartment air filter, if equipped
– Blocked or damaged air inlet or outlet vents
Intermittent
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to
Testing for Intermittent Conditions and Poor Connections.
Symptom List
Refer to HVAC System Malfunction in order to diagnose the symptom.