Schematic Reference: HVAC Schematics

DEFINITION: Air recirculation is inoperative or is always ON.

Did you review the HVAC operation and perform the necessary inspections?

Go to Step 2

Go to Symptoms - HVAC Systems - Manual

1. Turn ON the ignition, with the engine OFF.
2. Place the blower motor switch in the maximum speed position.
3. Place the bi-level switch in the ON position.
4. Place the recirculation switch in the ON and OFF positions.

Does the recirculation door operate properly?

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

Go to Step 3

Observe the recirculation actuator drive shaft.

Does the recirculation actuator drive shaft rotate continuously?

Go to Step 4

Go to Step 5

Test the recirculation door position signal circuit of the recirculation actuator for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 17

1. Observe the drive shaft of the recirculation actuator.
2. Place the recirculation switch in the ON and OFF positions.

Does the recirculation actuator drive shaft rotate at all?

Go to Step 6

Go to Step 9

Test the recirculation door control A circuit of the recirculation actuator for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 7

Test the recirculation door control B circuit of the recirculation actuator for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 8

Test the recirculation door position signal circuit of the recirculation actuator for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 17

1. Observe the drive shaft of the recirculation actuator.
2. Connect a 3-amp fused jumper wire between the recirculation door position signal circuit and a good ground.

Does the recirculation actuator shaft drive rotate?

Go to Step 10

Go to Step 12

Test the recirculation door control A circuit of the recirculation actuator for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 11

Test the recirculation door control B circuit of the recirculation actuator for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 17

Test the battery positive voltage circuit of the recirculation actuator for an open, high resistance or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 13

Test the recirculation door control A circuit of the recirculation actuator for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 14

Test the recirculation door control B circuit of the recirculation actuator for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 15

Test the recirculation door position signal circuit of the recirculation actuator for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 20

Go to Step 16

Inspect for poor connections at the harness connector of the recirculation 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 20

Go to Step 18

Inspect for poor connections at the harness connector of the HVAC control module. 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 20

Go to Step 19

Replace the recirculation actuator. Refer to Recirculation Actuator Replacement .

Did you complete the replacement?

Go to Step 20

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Replace the HVAC control module. Refer to HVAC Control Module Replacement .

Did you complete the replacement?

Go to Step 20

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3