| Table 1: | Poor Defrosting |
| Table 2: | No Heat (Blower Motor Working) |
| Table 3: | Heater Gurgling Sound |
| Table 4: | Poor Ventilation |
Problem | Action |
|---|---|
The valves which control airflow are not functioning correctly. | Determine and correct the cause of the malfunction. |
The blower motor is not working. | Determine and correct the cause of the malfunction. Refer to Blower Motor Inoperative at Any Speed . |
There is blockage in the defroster outlets. | Remove the blockage. |
A restricted heater core and/or hoses. | Flush the cooling system. Refer to Flushing in Engine Cooling. |
A faulty thermostat and/or radiator cap. | Determine and correct the cause of the malfunction. Refer to Thermostat Diagnosis in Engine Cooling. |
There is blockage in front of the air conditioning filter. | Clean the air conditioning filter. Refer to Passenger Compartment Air Filter Replacement . |
There is blockage in path of door. | Remove the blockage. |
Problem | Action |
|---|---|
There is low engine coolant level. | Check the engine coolant level. Refer to Draining and Filling Cooling System . |
A faulty thermostat and/or radiator cap. | Determine and correct the cause of the malfunction. Refer to Thermostat Replacement (7.2L) in Engine Cooling. |
A Restricted heater core and/or hoses. | Flush the cooling system. Refer to Flushing in Engine Cooling. |
A faulty Temperature actuator. | Check the actuator function and replace as necessary. Refer to Temperature Actuator Replacement . |
The pivot shaft on the doors is not seated correctly. | Seat the pivot shaft on the door(s) correctly. |
There is a blockage in front of the air conditioning filter. | Clean the air conditioning filter. Refer to Passenger Compartment Air Filter Replacement . |
There is blockage in the path of the door. | Remove the blockage. |
Problem | Action |
|---|---|
There is low engine coolant. | Check the engine coolant level. Refer to Draining and Filling Cooling System |
A restricted heater core and/or hoses. | Flush the cooling system. Refer to Flushing in Engine Cooling. |
Problem | Action |
|---|---|
A blockage in the heater vent module. | Remove the blockage in the heater vent module. |
A blockage in the inlet actuator air duct. | Remove the blockage in the inlet actuator air duct. |
A binding or sticking of the inlet actuator air door. | Repair and replace as necessary. |
The inlet actuator air door is not operating. | Repair and replace the door as necessary. |
A faulty inlet actuator. | Replace the air inlet actuator. Refer to Air Inlet Actuator Replacement . |
The pivot shaft on the door is not seated correctly. | Seat the pivot shaft on the door(s). |
