For 1990-2009 cars

Step | Action | Yes | No
--- | --- | --- | ---
Schematic Reference: HVAC Schematics Connector End View Reference: HVAC Connector End Views DEFINITION: Air recirculation is inoperative or is always ON.
1 | Did you perform the HVAC Diagnostic System Check? | Go to Step 2 | Go to Diagnostic System Check - HVAC Systems - Manual
2 |

1. Turn ON the ignition, with the engine OFF.
2. Place the blower motor switch at the maximum speed position.
3. Place the mode switch in the vent position.
4. Place the recirculation switch in the ON position.
5. Observe the recirculation door.
6. Place the recirculation switch in the OFF position.

Does the recirculation door move from the recirculation to the outside air position?

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

Go to Step 3

3 |

1. Turn OFF the ignition.
2. Disconnect the recirculation actuator.
3. Turn ON the ignition, with the engine OFF.
4. Connect a test lamp between recirculation door control A and recirculation door control B of the recirculation actuator connector.
5. Place the blower motor switch in the maximum speed position.
6. Place the mode switch in the vent position.
7. Place the recirculation switch in the ON position.
8. Place the recirculation switch in the OFF position.

Does the test lamp illuminate in both, recirculation and ambient air, positions?

Go to Step 5

Go to Step 4

4 | Test the recirculation door control A and B circuits of the recirculation actuator for an open, for a high resistance, for a short to ground, or for a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 12 | Go to Step 6
5 | Inspect the recirculation door and the recirculation actuator for the following conditions:

• | A misaligned recirculation actuator

| Refer to Recirculation Actuator Replacement .

• | Broken or binding linkages or recirculation door

• | An obstruction that prevents the recirculation actuator from operating within the full range of motion

• | Missing seals to the recirculation door

• | Misaligned seals to the recirculation door

Did you find and correct the condition?

Go to Step 12

Go to Step 8

6 | Test the ignition 3 voltage and battery positive voltage circuits of the HVAC control assembly for an open or for a high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 12 | Go to Step 7
7 | Test the ground circuit of the HVAC control assembly for an open or for a high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 12 | Go to Step 9
8 | Inspect for bad connections at the harness connector of the recirculation actuator. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 12 | Go to Step 10
9 | Inspect for bad connections at the harness connector of the HVAC control assembly. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 12 | Go to Step 11
10 | Replace the recirculation actuator. Refer to Recirculation Actuator Replacement . Did you complete the replacement? | Go to Step 12 | --
11 | Replace the HVAC Control Module. Refer to HVAC Control Module Replacement . Did you complete the replacement? | Go to Step 12 | --
12 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3