GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2000 🢒 Eldorado 🢒 HVAC 🢒 HVAC Systems - Automatic 🢒 Symptoms

Important: Complete the following steps before using the symptom tables:

  1. Perform the Diagnostic System Check before using the Symptom Tables in order to verify that all of the following are true:
    2. • No DTCs are set.
    • The control modules can communicate via the serial data link.
  2. Review the system operation in order to familiarize yourself with the system functions. Refer to the following procedures:
    3. •  Dual Zone Air Conditioning (A/C) System Description
    •  Operating Modes
    •  Purge Mode Description
    •  Programmer Description
    •  Control Assembly Description
    •  Control Assembly Description - Passenger

Visual/Physical Inspection
    • Inspect for aftermarket devices which could affect the operation of the HVAC System. Refer to Checking Aftermarket Accessories in Wiring Systems.
    • 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 Conditions and Poor Connections in Wiring Systems.

Symptom List

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

    •  HVAC Compressor Clutch Does Not Engage
    •  Blower Motor Always On
    •  Blower Motor Does Not Operate Properly
    •  Cooling Insufficient - Air Conditioning (A/C) System
    •  Air Temperature Control Inoperative - Passenger
    •  Air Delivery Improper
    •  Self-Diagnostics
    •  Heating Insufficient in Heating, Ventilation and Air Conditioning
    •  Noise Diagnosis - Blower Motor in Heating, Ventilation and Air Conditioning
    •  Noise Diagnosis - Air Conditioning (A/C) System in Heating, Ventilation and Air Conditioning
    •  Odor Diagnosis in Heating, Ventilation and Air Conditioning