Air Delivery and Temperature Control Check for Buick Park Avenue 1999

1. Connect the scan tool.
2. Inspect for any DTCs.

Are any HVAC DTCs present?

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Go to DTC Table

Go to Step 2

1. Ensure the outside temperature is 5°C (41°F) or higher.
2. Ensure the engine is warm and idling.
3. Set the Heater and the A/C control assembly to 29°C (85°F).
4. Set the passenger temperature control to the neutral setting.
5. Compare the outlet temperature between the left and the right center outlets.

Are the left and right center outlet air temperatures cold and approximately equal in temperature?

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Go to Step 6

Go to Step 3

1. Turn the A/C OFF.
2. Connect the J 39400 .

Are the pressures above 350 kPa (50 psi)?

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Go to Step 5

Go to Step 4

1. Add 0.453 kg (1 lb) of refrigerant.
2. Perform a leak test. Refer to Leak Testing .

Was there a leak found and repaired?

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Go to Step 5

Go to Step 5

Recover and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .

Is the repair complete?

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Go to Step 6

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1. Set the Heater and the A/C control assembly to 29°C (85°F).
2. Set the passenger temperature control to the coldest setting.
3. Compare the outlet temperature between the left and the right center outlets.

Is the right center outlet air temperature cooler than the left outlet?

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Go to Step 7

Go to Step 8

1. Set the main Heater and the A/C control assembly to 18°C (65°F).
2. Set the passenger temperature control to the warmest setting.
3. Compare the outlet temperature between the left and the right center outlets.

Is the right center outlet air temperature warmer than the left outlet?

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System OK

Go to Step 8

Inspect and repair the door/actuator for binding, proper mounting or broken components.

Is the repair complete?

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System OK

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