Symptoms - HVAC Systems - Manual

Symptoms - HVAC Systems - Manual

Important: Review the Air Delivery Description and Operation (Air Delivery Description and Operation) and the Air Temperature Description and Operation (Air Temperature Description and Operation) in order to familiarize yourself with the system functions.


Visual/Physical Inspection

* Inspect for aftermarket devices which could affect the operation of the system. Refer to Checking Aftermarket Accessories (Checking Aftermarket Accessories).
* Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
* Inspect all related ground points for being clean and tight.

Intermittent

Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections).

Symptom List

Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

* HVAC Compressor Clutch Does Not Engage (HVAC Compressor Clutch Does Not Engage)
* HVAC Compressor Clutch Does Not Disengage (HVAC Compressor Clutch Does Not Disengage)
* Blower Motor Always On (Blower Motor Always On)
* Blower Motor Inoperative (Blower Motor Inoperative)
* Blower Motor Malfunction (Blower Motor Malfunction)
* Air Delivery Improper (Air Delivery Improper)
* Air Recirculation Malfunction (Always in Fresh Position) (Air Recirculation Malfunction (Always in Fresh Position))Air Recirculation Malfunction (Always in Recirculation Position) (Air Recirculation Malfunction (Always in Recirculation Position))Air Recirculation Malfunction (Inoperative) (Air Recirculation Malfunction (Inoperative))

Refer to Symptoms - Engine Cooling (Symptoms - Engine Cooling) for diagnosis of the electric cooling fan.

Refer to the following:

* Leak Testing (Leak Testing)
* Noise Diagnosis - Air Conditioning (A/C) System (Noise Diagnosis - Air Conditioning (A/C) System)
* Noise Diagnosis - HVAC Module (Noise Diagnosis - HVAC Module)
* Odor Diagnosis (Odor Diagnosis)