GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1998 🢒 Park Avenue 🢒 HVAC 🢒 HVAC Systems - Automatic 🢒 Cooling Insufficient - Air Conditioning (A/C) Inoperative

Step

Action

Value(s)

Yes

No

Tools Required: J 39500-B

1

Inspect for any stored DTCs.

Are any DTCs stored?

--

Go to Step 3

Go to Step 2

2

Connect the J 39500-B .

Are the pressures above 350 kPa (50 psi)?

--

Go to Step 4

Go to Step 8

3

Correct any stored DTCs. Refer to HVAC Compressor Clutch Does Not Engage .

Does the complaint persist?

--

Go to Step 1

System OK

4

Inspect and correct for a blown air conditioner (A/C) fuse. Refer to Circuit Protection - Fuses .

Does the complaint persist?

--

Go to Step 5

System OK

5

Inspect and correct for the following conditions:

    • Disconnected A/C clutch wire
    • Proper A/C clutch rotation

Refer to HVAC Compressor Clutch Does Not Engage .

Does the complaint persist?

--

Go to Step 6

System OK

6

Inspect and correct for the following conditions:

    • Condenser restrictions
    • Radiator restrictions

Refer to Engine Cooling.

Does the complaint persist?

--

Go to Step 7

System OK

7

Read the DCS for Bulletins and Hints.

Follow the procedures indicated.

Does the complaint persist?

--

Go to Step 10

System OK

8
  1. Add 0.453 kg (1 lb) of refrigerant.
  2. Perform a leak check. Refer to Leak Testing .

Did you find a leak?

--

Go to Step 9

Go to Step 1

9
  1. Repair the leak.
  2. Inspect the system performance. Refer to System Performance Test .

Does the complaint persist?

--

Go to Step 2

System OK

10

Perform an A/C Performance Check using the following steps:

  1. Ensure that the ambient temperature is at least 5°C (41°F).
  2. Ensure that the engine is idling at normal operating temperature.
  3. Turn the A/C to the ON position.
  4. Select the coldest setting.
  5. Select the MAX blower speed.
  6. Record the A/C pressures.
  7. Record the A/C temperatures.
  8. Refer to System Performance Test .

Does the A/C performance meet the requirement on the Performance Chart?

--

Go to Step 11

Go to System Performance Test

11

Was the customer complaint made due to high temperature and/or high humidity?

--

Go to Step 12

System OK

12

Perform a leak test. Refer to System Performance Test .

Did you find a leak?

--

Go to Step 13

System OK

13

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

Does the complaint persist?

--

Go to Step 10

System OK