Verify the customers complaint.

Are the customer's concerns verified?

Go to Step 2

System OK

1. Examine the affected door in the unit for proper attachment to the vacuum actuator.
2. Inspect the actuator connection to the door.
3. Verify the vacuum hose is properly connected.

Is everything connected properly?

Go to Step 4

Go to Step 3

Repair as necessary.

Is the repair complete?

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System OK

1. Disconnect the actuator at the door.
2. Inspect the range of the door travel and the effort required to move it.

Does the door move freely through its entire range of travel so that it can close at both ends of the range?

Go to Step 5

Go to Step 3

Inspect the travel of the actuator by turning the control knob with the engine running.

Is the actuator travel OK?

Go to Step 6

Go to Step 7

1. Reinstall the actuator.
2. Inspect the system for proper operation.

Does the system perform properly?

System OK

Go to Step 9

1. Inspect the vacuum hose at the control.
2. Inspect for a broken control.

Is there a problem with the vacuum hose or the control?

Go to Step 8

Go to Step 9

Repair the vacuum hose or the control as necessary.

Is the repair complete?

System OK

Go to Step 9

Recheck the system using the Control Settings/Correct Results tests.

Is the repair complete?

System OK

Go to Step 10

Check for airflow from the defroster or the vent outlets.

Is there high airflow from the defroster or the vent outlets?

Go to Step 11

Go to Step 12

Adjust the heater door at the floor and the vent door to get the proper airflow.

Is the repair complete?

System OK

--

Switch the mode knob to defrost.

Is the defroster airflow OK?

Go to Step 13

Go to Step 14

1. Remove the heater outlet.
2. Inspect the heater outlet for obstructions.
3. Remove the any obstructions in the heater outlet.

Is the repair complete?

System OK

--

Check the blower speeds for change in the airflow.

Does the blower speed increase as the control is turned from 1 to 4?

Go to Step 15

Go to Blower Motor Malfunction

1. Inspect for obstructions in the system at the blower inlet and inspect the air filter if the vehicle is so equipped.
2. Remove any obstructions at the blower inlet and replace the filter if it is clogged.

Is the repair complete?

System OK

Go to Step 16

1. Set the blower on 4.
2. Rotate the temperature control from full hot to full cold.
3. Listen for an airflow change.

Does the airflow change?

Go to Step 17

Go to Step 18

1. Inspect the temperature door, the cable, the linkage, and the control.
2. Adjust the temperature control to full hot.

Is the repair complete?

System OK

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1. Inspect the system for any obstruction between the blower and the system outlets.
2. Remove any obstruction between the blower and the system outlets.

Is the repair complete?

System OK

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