Visual/Physical Inspection - HVAC System - Manual

IMPORTANT: Review the system operation in order to familiarize yourself with the system functions. Refer to HVAC Blower Controls Circuit Description HVAC Blower Controls Circuit Description - Auxiliary HVAC Compressor Controls Circuit Description Temperature Control Motor Circuit Description.

VISUAL/PHYSICAL INSPECTION
^ Inspect for aftermarket devices which could affect the operation of the HVAC system. Refer to Checking Aftermarket Accessories in Diagrams.
^ Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

INTERMITTENT
Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent and Poor Connections in Diagrams.

SYMPTOM LIST
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:
^ HVAC Compressor Clutch Does Not Engage. Compressor Clutch Does Not Engage
^ Blower Motor Inoperative at Any Speed. Blower Motor Inoperative - At Any Speed
^ Blower Motor Low and Medium Speeds Inoperative. Blower Motor Low and Medium Speeds Inoperative
^ Blower Motor High Speed Inoperative. Blower Motor High Speed Inoperative
^ Blower Motor Always On. Blower Motor Always On
^ Blower Motor Inoperative at Any Speed - Auxiliary. Blower Motor Inoperative - At Any Speed - Auxiliary
^ Blower Motor Inoperative at Any Speed - Auxiliary A/C. Blower Motor Inoperative - At Any Speed - Auxiliary
^ Blower Motor Low Speed Inoperative - Auxiliary. Blower Motor Low Speed Inoperative - Auxiliary
^ Blower Motor Low Speed Inoperative - Auxiliary A/C. Blower Motor Low Speed Inoperative - Auxiliary
^ Blower Motor Medium Speed Inoperative - Auxiliary. Blower Motor Medium Speed Inoperative - Auxiliary
^ Blower Motor Medium Speed Inoperative - Auxiliary A/C. Blower Motor Medium Speed Inoperative - Auxiliary
^ Blower Motor High Speed Inoperative - Auxiliary. Blower Motor High Speed Inoperative - Auxiliary
^ Blower Motor High Speed Inoperative - Auxiliary A/C. Blower Motor High Speed Inoperative - Auxiliary
^ Blower Motor Always On - Auxiliary. Blower Motor Always On - Auxiliary
^ Blower Motor Always On - Auxiliary A/C. Blower Motor Always On - Auxiliary
^ Heating Insufficient. Heating Insufficient
^ Heating Insufficient - Auxiliary. Heating Insufficient - Auxiliary
^ Defrosting Insufficient in Heating, Ventilation, and Air Conditioning. Defrosting Insufficient
^ Heat Excessive in Heating, Ventilation, and Air Conditioning. Heat Excessive
^ Air Delivery Improper in Heating, Ventilation, and Air Conditioning. Air Delivery Improper
^ Noise Diagnosis (RPO C60) in Heating, Ventilation, and Air Conditioning. Noise Diagnosis - RPO C60
^ Odor Diagnosis (RPO C60) in Heating, Ventilation, and Air Conditioning. Odor Diagnosis - RPO C60

For a description of the RPO Code(s) shown in this article/images refer to the RPO Code List found at Vehicle/Application ID RPO Codes