For 1990-2009 cars

## System Performance Test Oldsmobile

Important: Record the relative humidity and ambient temperature conditions at the time of the test.

1. Park the vehicle inside or in the shade. The ambient temperature must be at least 16°C (60°F).
2. Open the windows in order to ventilate the interior.
3. Vent the engine exhaust.
4. Open the hood and install the J 39183-C .
5. Record the ambient temperature where the vehicle is parked.
6. Record the relative humidity. Use a psychrometer or consult the local weather bureau.
7. Close all of the doors and the windows.
8. Lower the hood.
9. Set the A/C control assembly to MAX mode with the blower speed set to high and the temperature to full cold. Ensure that the vent button LED is not illuminated.
10. Open the A/C air outlet deflectors.
11. Place a thermometer in the left center A/C outlet.
12. Place the transaxle in PARK. Start the engine. Let the engine idle.
13. Run the A/C system until the outlet air reaches a stabilized temperature. (about 3 minutes).
14. Record the outlet air temperature and the high side and low side pressures.
15. Turn the engine off and compare the readings with the data in the A/C Performance Table. Normally operating A/C Systems should not exceed levels shown.
16. If the readings exceed the table limits, refer to High Side vs Low Side Pressure Table and Gray Area Diagnosis and Service in Cooling Insufficient.
17. If you were sent here from a DTC diagnostic table, clear the DTC upon completion of the test.

#### Oldsmobile

Temperature | Humidity | Low Side Service Port Pressure (in psig) | High Side Service Port Pressure (in psig) | A/C Discharge Temperature
--- | --- | --- | --- | ---
21°C (70°F) | Low (less than 50%) | 25-30 | 140-190 | 6-9°C (43-48°F)
High (greater than 50%) | 31-36 | 165-205 | 11-14°C (52-57°F)
27°C (80°F) | Low (less than 50%) | 26-32 | 150-200 | 7-11°C (45-51°F)
High (greater than 50%) | 35-43 | 190-240 | 13-17°C (56-62°F)
32°C (90°F) | Low (less than 50%) | 31-37 | 170-220 | 10-13°C (50-56°F)
High (greater than 50%) | 40-48 | 210-260 | 16-19°C (61-67°F)
38°C (100°F) | Low (less than 50%) | 35-43 | 195-245 | 12-16°C (54-60°F)
High (greater than 50%) | 44-52 | 230-280 | 17-21°C (63-69°F)
43°C (110°F) | Low (less than 50%) | 40-48 | 235-285 | 14-18°C (58-64°F)
High (greater than 50%) | 46-54 | 260-310 | 18-21°C (64-70°F)

## System Performance Test Buick

Important: Record the relative humidity and ambient temperature conditions at the time of the test.

1. Park the vehicle inside or in the shade. The ambient temperature must be at least 16°C (60°F).
2. Open the windows in order to ventilate the interior.
3. Vent the engine exhaust.
4. Open the hood and install the J 39183-C .
5. Record the ambient temperature where the vehicle is parked.
6. Record the relative humidity. Use a psychrometer or consult the local weather bureau.
7. Close all the doors and windows.
8. Lower the hood.
9. Set the A/C control assembly to MAX mode with the blower speed set to high, the temperature to full cold and push the A/C button to turn on the A/C.
10. Open the A/C air outlet deflectors.
11. Place a thermometer in the left A/C outlet.
12. Place the transaxle in PARK. Start the engine. Let the engine idle.
13. Run the A/C system until the outlet air reaches the lowest temperature (about 3 minutes).
14. Record the outlet air temperature and the high side and low side pressures.
15. Turn the engine off and compare the readings with the data in the A/C performance Table. Normally operating A/C systems should not exceed levels shown.
16. If the readings exceed the table limits, refer to High Side vs. Low Side Pressure Table and Gray Area Diagnosis and Service in Cooling Insufficient.
17. If you were sent here from a DTC diagnostic table, clear the DTC upon completion of the test.

#### Buick

Temperature | Humidity | Low Side Service Port Pressure in PSIG | High Side Service Port Pressure in PSIG | A/C Discharge Temperature
--- | --- | --- | --- | ---
16°C (60°F) | Less than 40 | 28-34 | 110-130 | 6-8°C (42-46°F)
High | 32-38 | 160-190 | 7-8°C (44-46°F)
21°C (70°F) | Less than 40 | 30-34 | 190-210 | 3-6°C (38-43°F)
High | 34-40 | 200-220 | 7-9°C (44-48°F)
27°C (80°F) | Less than 40 | 28-36 | 160-180 | 4-7°C (40-45°F)
High | 38-36 | 170-190 | 6-9°C (43-48°F)
32°C (90°F) | Less than 40 | 34-40 | 180-200 | 6-9°C (43-48°F)
High | 34-40 | 190-210 | 7-10°C (44-50°F)
38°C (100°F) | Less than 40 | 38-46 | 200-220 | 9-12°C (48-54°F)
High | 42-50 | 210-250 | 13-17°C (56-62°F)
43°C (110°F) | Less than 40 | 48-60 | 280-340 | 16-20°C (60-68°F)
High | 54-64 | 340-360 | 21-23°C (70-74°F)
49°C (120°F) | Less than 40 | 56-64 | 320-360 | 17-22°C (62-72°F)