Symptoms - HVAC Systems - Manual. Chevrolet Chevy C Cab/Chassis HD (GMT 400) 2002

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2002 🢒 Chevy C Cab/Chassis HD (GMT 400) 🢒 HVAC 🢒 HVAC Systems - Manual 🢒 Symptoms - HVAC Systems - Manual

Important: Review the system operation in order to learn the system functions. Refer to:

•	Air Delivery Description and Operation

•	Air Temperature Description and Operation

•	Inspect for aftermarket devices which could affect the operation of the HVAC System. Refer to Checking Aftermarket Accessories in Wiring Systems.

•	Inspect the system components for obvious damage or for conditions which can cause the symptom.

•	Verify the A/C compressor clutch turns freely and is not seized.

•	The A/C compressor will not operate in cold outside air temperatures. Refer to Air Temperature Description and Operation .

•	The following could cause window fogging:

-	A wet carpet

-	High humidity

-	An interior water leak

-	A blocked A/C evaporator drain tube

-	Maximum passenger capacity

-	Blocked body pressure relief valves

•	Inspect the air distribution system for causes of reduced airflow:

-	A passenger compartment air filter which is obstructed or dirty

-	Blocked air inlet vents or damaged air inlet vents

-	Blocked air outlet vents or damaged air outlet vents

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

Refer to a symptom diagnostic procedure from the following list:

•	HVAC Compressor Clutch Does Not Engage

•	HVAC Compressor Clutch Does Not Disengage

•	Blower Motor Always On

•	Blower Motor Inoperative

•	Blower Motor Malfunction

•	Too Hot in Vehicle

•	Too Cold in Vehicle

•	Air Delivery Improper

•	Leak Testing in Heating, Ventilation and Air Conditioning

•	Defrosting Insufficient in Heating, Ventilation and Air Conditioning

•	Cooling Insufficient - Air Conditioning (A/C) Inoperative 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