Schematic Reference: HVAC Schematics

DEFINITION: Air recirculation is inoperative or is always ON.

Did you perform the HVAC Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - HVAC Systems - Manual

1. Start the engine.
2. Place the headlamp switch in the PARK position.
3. Place the instrument panel dimmer switch in the brightest position.
4. Place the mode switch in the vent position.
5. Place the blower motor switch in the maximum speed position.
6. Place the outside air switch in the ON position.
7. Place the recirculation switch in the ON position.

Does the recirculation door operate properly?

Go to Step 3

Go to Step 4

Place the mode switch in the defrost position.

Does the recirculation door move to the outside air position?

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

Go to Step 9

Does the air temperature switch operate properly?

Go to Vacuum Control System Diagnostic

Go to Step 5

5

Test the ignition 3 voltage circuit of the HVAC control module for an open, high resistance, or short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 6

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

Did you find and correct the condition?

Go to Step 11

Go to Step 7

Test the ground circuit of the HVAC control module 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 11

Go to Step 8

Test the off blower motor control circuit of the HVAC control module 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 11

Go to Step 9

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 11

Go to Step 10

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

Did you complete the replacement?

Go to Step 11

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2