Air Delivery Improper

Air Delivery Improper

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.

Circuit/System Description

The mode door is a mechanical cable operated door.

Reference Information
Schematic Reference

HVAC Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Description and Operation

* Air Temperature Description and Operation (Air Temperature)
* Air Delivery Description and Operation (Air Delivery)

Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

1. Start the engine, place the mode switch in the Vent position. Place the blower motor in the high speed position and the air temperature to the coldest setting. The A/C compressor clutch should engage.

• If the HVAC compressor clutch does not engage , refer to the Air Conditioning Compressor Malfunction (Air Conditioning Compressor Malfunction).

2. Ignition On, place the blower switch in each speed position, the blower motor should operate in each speed.

• If the blower motor does not function properly in each speed position, refer to Blower Motor Malfunction (Blower Motor Malfunction).

3. Place the recirculation switch in each position. The recirculation door should move from the outside air position to the recirculate position.

• If the recirculation door does not function properly in each position, refer to Air Recirculation Malfunction (Air Recirculation Malfunction).

4. Inspect the mode door for the following conditions:

* High effort to operate the mode door
* Broken or binding linkages
* An obstruction that prevents the mode door from moving it's full range
* Missing seals to the mode doors
* Misaligned seals to the mode door

• If any of the above conditions exist, refer to the appropriate corrective action.