Schematic Reference : HVAC Schematics

DEFINITION: The air recirculation is inoperative or always ON.

Did you review HVAC operation and perform the necessary inspections?

Go to Step 2

Go to Air Delivery Description and Operation

2

1. Turn ON the ignition, with the engine OFF.
2. Place the blower control to the highest speed position.
3. Place the mode control to each position.

Does the mode actuator operate correctly for each mode position?

Go to Step 3

Go to Air Delivery Improper

3

1. Place the mode control to the floor position.
2. Press the REC switch ON.
3. Press the OSA switch ON.

Does the air inlet actuator operate correctly for each mode position?

Go to Step 4

Go to Step 7

4

Perform the A/C system performance test. Refer to Air Conditioning (A/C) System Performance Test in HVAC.

Does the high side pressure reading indicate a condition in the A/C system which requires operation in the automatic recirculation mode?

Go to Step 5

Go to Step 6

Repair or replace the failed component.

Did you complete the repair or the replacement?

Go to Step 17

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1. Start the engine.
2. Place the mode control to the vent position.
3. Press the A/C switch ON.
4. Press the REC switch ON.
5. Press the OSA switch ON.

Does the recirculation actuator operate correctly for each mode position?

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

Go to Step 7

Test the ignition 3 voltage circuit of the recirculation actuator for an open or high resistance. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 17

Go to Step 8

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

Did you find and correct the condition?

Go to Step 17

Go to Step 9

1. Verify the recirculation door is in the recirculation mode position.
2. Disconnect the connector to the A/C high pressure recirculation switch.

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

Go to Step 10

Go to Step 11

10

1. Turn OFF the ignition.
2. Measure for continuity through the A/C high pressure switch.

Is continuity present?

Go to Step 15

Go to Step 11

Test the output signal circuit to the high pressure cut-off switch on the secondary A/C refrigerant for a high resistance or for a short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 17

Go to Step 12

Test the control circuit at the recirculation actuator for an open short to ground or short to voltage. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 17

Go to Step 13

Inspect for poor connections at the PCM. 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 17

Go to Step 14

Replace and reprogram the VCM or thePCM. Refer to Powertrain Control Module Replacement in Engine Controls - 4.8L, 5.3L, and 6.0L.or Powertrain Control Module Replacement in Engine Controls - 8.1L

Did you complete the replacement?

Go to Step 17

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Inspect for poor connections at the secondary A/C refrigerant high pressure switch. 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 17

Go to Step 16

Replace the A/C high pressure recirculation switch. Refer to Air Conditioning (A/C) High Pressure Switch Replacement in Heating, Ventilation and Air Conditioning.

Did you complete the replacement?

Go to Step 17

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2