Symptoms - HVAC Systems - Manual. Buick Lucerne 2008

For 1990-2009 cars only

Makes 🢒 Buick 🢒 2008 🢒 Lucerne 🢒 HVAC 🢒 Heating, Ventilation, and Air Conditioning 🢒 Symptoms - HVAC Systems - Manual

Important: Review the system operation in order to familiarize yourself with 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 .

•	Inspect the easily accessible or visible system components for obvious damage or conditions which could 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 Conditioning Compressor Malfunction .

•	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

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

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

•	Air Conditioning Compressor Malfunction

•	Blower Motor Malfunction

•	Air Temperature Malfunction