Did you perform the HVAC Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check

1. Turn ON the ignition, with the engine OFF.
2. Adjust the air flow discharge using the mode buttons on the heater and A/C control.

Does the air flow change discharge locations?

Go to Step 3

Go to Step 4

With a scan tool, command the HTR/DEF/AC door position from Defrost to Panel.

Does the air flow change discharge locations?

Go to Step 5

Go to Step 4

1. Perform the Recalibrate all Motors command in the instrument panel module Special Functions using the scan tool.
2. Observe the current DTC list in the instrument panel module using the scan tool.

Does the scan tool display any DTCs.

Go to DTC Table

Go to Step 6

1. Fully open all panel outlets.
2. Select PANEL mode.
3. Set the blower speed to illuminate 2 bars on the blower speed display.
4. Inspect for airflow through the inside air temp sensor by placing a 5cm (2in) square piece of paper over the sensor air inlet.

Does the paper stay in place?

Go to Step 8

Go to Step 12

Inspect the mode actuator for binding or mechanical failure.

Did you find and correct the condition?

Go to Step 18

Go to Step 7

Inspect for blocked or misaligned ducts.

Did you find and correct the condition?

Go to Step 18

Go to Step 13

Inspect for poor connections at the harness connector of the inside air temp sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 9

Test the inside air temp sensor resistance. Refer to Sensor Resistance Table .

Is the resistance within the specified values?

Go to Step 10

Go to Step 15

Inspect for poor connections at the harness connector of the outside air temperature sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 11

Test the outside air temperature sensor resistance. Refer to Sensor Resistance Table .

Is the resistance within the specified values?

Go to Step 17

Go to Step 16

Inspect for blockage, disconnected or poor fitting foam seals at the sensor air inlet.

Did you find and correct the condition?

Go to Step 18

--

Inspect for poor connections at the harness connector of the mode actuator. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 18

Go to Step 14

Replace the mode actuator. Refer to Mode Actuator Replacement .

Did you complete the replacement?

Go to Step 18

--

Replace the inside air temp sensor. Refer to Inside Air Temperature Sensor Replacement .

Did you complete the replacement?

Go to Step 18

--

Replace the outside air temperature sensor. Refer to Ambient Temperature Sensor Replacement .

Did you complete the replacement?

Go to Step 18

--

1. Start the engine.
2. Operate the system. Refer to the appropriate procedure:

•	Dual Zone Air Conditioning (A/C) System Description

•	Operating Modes

•	Control Assembly Description

•	Control Assembly Description - Passenger

Does the system operate correctly?

System OK

Go to Symptoms

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2