Schematic Reference: HVAC Schematics

Did you review the Air Delivery Description and Operation and the Air Temperature Description and Operation and perform the necessary inspections?

Go to Step 2

Go to Symptoms - HVAC Systems - Manual

1. Start the engine.
2. Open the instrument panel compartment.
3. Observe the air inlet actuator while pressing the air inlet switch to the recirculate position.

Does the air inlet actuator operate?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

1. Remove the instrument panel compartment. Refer to Instrument Panel Compartment Replacement in Instrument Panel, Gages and Console.
2. Connect a fused jumper wire between terminal 5 of C224 and B+.
3. Connect a fused jumper wire between terminal 4 of C224 and ground.
4. Connect a fused jumper wire between terminal 1 of C224 and ground.
5. When the ground is removed from terminal 1 the actuator should rotate counterclockwise to the recirculate position. When the ground is applied to terminal 1 the actuator shaft should rotate clockwise to the fresh position.

Does the air inlet actuator operate correctly?

Go to Step 4

Go to Step 9

Test the air inlet actuator supply voltage circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 5

Test the air inlet actuator recirculation signal circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 6

Test the air inlet actuator ground circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 7

Test the air inlet and rear defogger switch ground circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 8

Inspect for poor connections at the harness connector of the air inlet and rear defogger switch. Refer to Testing for Intermittent Conditions and Poor Connections Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 11

Inspect for poor connections at the harness connector of the air inlet 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 12

Go to Step 10

Replace the air inlet actuator. Refer to Recirculation Actuator Replacement .

Did you complete the replacement?

Go to Step 12

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Replace the air inlet and rear defogger switch. Refer to Rear Window Defogger Switch Replacement in Stationary Windows.

Did you complete the replacement?

Go to Step 12

--

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3

1-BLU/WHT

Signal

0-1 volt

Ignition Switch ON, RECIRCULATION Position

4-5 volts

Ignition Switch ON, FRESH Position

0-1 volt

Ignition Switch ON, FRESH to RECIRCULATION Position

Approximately 10 volts

Ignition Switch ON, RECIRCULATION to FRESH Position

2-GRN/YEL

Not Used

3

Not Used

4-WHT/BLK

Ground

0-1 volt

Ignition Switch ON

5-RED/BLU

Ignition Positive Voltage

B+

Ignition Switch ON