1. Engine idling.
2. Check for vacuum on the main vacuum supply source at the HVAC Programmer Vacuum Line Connector.

Is vacuum present?

Go to Step 2

Go to Step 5

Using a vacuum pump, apply vacuum to each actuator line at the HVAC Programmer Vacuum Line Connector.

Do all the lines hold vacuum?

Go to Step 3

Go to Step 4

Inspect the actuator doors for binding.

Did you find and correct the condition?

Go to Step 7

Go to Step 6

Inspect each vacuum line for an open or restriction, if no open or restriction was found replace the appropriate actuator.

Go to Step 7

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Locate condition and restore vacuum to source line.

Go to Step 7

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Replace the HVAC Programmer.

Go to Step 7

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Operate the system in order to verify the repair.

Did you correct the condition?

System OK

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