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Home >> Chevrolet >> 2018 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 45 (Heating, Ventilation And Air Conditioning) >> Diagnostic Information and Procedures >> Air Conditioning (A/C) System Performance Test >> Test Description

Test Description

WARNING: This page is about a different car, the 2017 Chevrolet Spark. However, it is still accessible from the selected car via links, so may be relevant.

This test measures the operating efficiency of the A/C system under the following conditions:

The numbers below refer to the step numbers on the diagnostic table.

  1. 1 

    This step determines if the A/C system has at least the minimum refrigerant charge required to operate the system without damage.

  2. 2 

    This step measures the performance of the A/C system.

  3. 3 

    This step is to allow for vehicle variations as well as high ambient temperatures.

Step Action Values Yes No
  • The ambient air temperature must be at least 16°C (60°F).
  • Do not induce additional air flow across the front of the vehicle during the test.
  • If you were sent here from a DTC diagnostic table, clear the DTC before starting this test.
  • At low ambient operating conditions, this vehicle's compressor will be commanded to cycle off & on based on the evaporator temperature. When comparing refrigerant system pressures and air outlet temperatures to this data table, ensure that the data is recorded while the compressor is engaged.
1 
  1. Park the vehicle inside or in the shade.
  2. Open the windows in order to ventilate the interior of the vehicle.
  3. If the A/C system was operating, allow the A/C system to equalize for about 2 minutes.
  4. Turn OFF the ignition.
  5. Install the J-43600  ACR 2000 Air Conditioning Service Center, GE-48800  CoolTech A/C Recharge Machine or GE-50300  R-1234yf Air Conditioning Refrigerant Recovery/Recharge Cart.
  6. Record the ambient air temperature and humanity.
  7. Record the low and high side STATIC pressure readings.
Are both the low side and high side pressures above the specified value?		 More than 16°C (60°F) - 345 kPa (50 psi)
More than 24°C (75°F) - 483 kPa (70 psi)
More than 33°C (90°F) - 690 kPa (100 psi)		 Go to Step 2  Go to Leak Testing (R-134a) Leak Testing (R-1234yf) 
2 
NOTE: Record the relative humidity and the ambient air temperature at the time of the test.
  1. Close the vehicle doors and windows.
  2. Open the drivers door window 12.7 - 15.2 cm (5 - 6 inches).
  3. Select the following HVAC control settings:
    • The A/C is ON
    • The coldest temperature setting
    • The maximum blower speed
    • Recirculation mode
    • The instrument panel (I/P) outlet mode
    • All I/P outlets are OPEN.
  4. Install thermometers in the left and right center panel air outlets.
  5. Apply the parking brake.
  6. Place the transaxle/transmission in one of the following positions:
    • PARK (Automatic)
    • NEUTRAL (Manual)
  7. Start the engine and warm to operating temperature.
  8. Operate the A/C system for 5 minutes.
  9. Inspect A/C components for the following conditions:
    • Abnormal frost areas
    • Unusual noises
  10. Record the following information:
    • The outlet air temperatures
    • The low-side pressure
    • The high-side pressure
  11. Compare the low and high side pressures and the panel output temperatures to the A/C Performance Table below.
Does all the data recorded fall within the specified ranges of the A/C Performance Table?		 - Go to Step 5  Go to Step 3 
3  If the pressures and temperatures recorded do not fall within the specified ranges of the A/C Performance Table:
  1. Continue to operate the A/C system for an additional 5 minutes.
  2. Record the pressures and temperatures again.
  3. Compare the low and high side pressures and the output temperature to the A/C Performance Table.

Does all the data recorded fall within the specified ranges of the A/C Performance Table below?		 - Go to Step 5  Go to Step 4 
4 Perform the necessary repairs. Refer to A/C Diagnostics Chart .
Is the action complete?		 - Go to Step 5  -
5 Operate the system in order to verify the test results.
Did you find the same results?		 - System OK Go to Symptoms - HVAC Systems - Automatic
A/C Performance Table (1.0L R-134a)

Ambient Air Temperature Relative Humidity Low Side Service Port Pressure High Side Service Port Pressure Maximum Left Center Discharge Air Temperature
13 - 18°C (55 - 65°F) 0 - 100% 151 - 227 kPa (22 - 33 psi) 716 - 1081 kPa (104 - 157 psi) 8°C (45°F)
19 - 24°C (66 - 75°F) Below 40% 151 - 241 kPa (22 - 35 psi) 778 - 1136 kPa (113 - 165 psi) 7°C (43°F)
Above 40% 172 - 261 kPa (25 - 38 psi) 868 - 1198 kPa (126 - 174 psi) 9°C (48°F)
25 - 29°C (76 - 85°F) Below 35% 186 - 254 kPa (27 - 37 psi) 1012 - 1288 kPa (147 - 187 psi) 8°C (45°F)
35 - 50% 192 - 261 kPa (28 - 38 psi) 1047 - 1288 kPa (152 - 187 psi) 9°C (48°F)
Above 50% 199 - 275 kPa (29 - 40 psi) 1067 - 1302 kPa (155 - 189 psi) 12°C (52°F)
30 - 35°C (86 - 95°F) Below 30% 206 - 282 kPa (30 - 41 psi) 1198 - 1481 kPa (174 - 215 psi) 12°C (52°F)
30 - 50% 213 - 289 kPa (31 - 42 psi) 1198 - 1460 kPa (174 - 212 psi) 13°C (55°F)
Above 50% 220 - 296 kPa (32 - 43 psi) 1212 - 1419 kPa (176 - 206 psi) 13°C (55°F)
36 - 41°C (96 - 105°F) Below 20% 234 - 310 kPa (34 - 45 psi) 1433 - 1708 kPa (208 - 248 psi) 14°C (57°F)
20 - 40% 241 - 310 kPa (35 - 45 psi) 1412 - 1646 kPa (205 - 239 psi) 14°C (57°F)
Above 40% 248 - 316 kPa (36 - 46 psi) 1391 - 1598 kPa (202 - 232 psi) 15°C (59°F)
42 - 46°C (106 - 115°F) Below 20% 268 - 330 kPa (39 - 48 psi) 1646 - 1887 kPa (239 - 274 psi) 17°C (61°F)
Above 20% 268 - 330 kPa (39 - 48 psi) 1632 - 1812 kPa (237 - 263 psi) 18°C (63°F)
47 - 49°C (116 - 120°F) Below 30% 289 - 351 kPa (42 - 51 psi) 1812 - 2011 kPa (263 - 292 psi) 19°C (66°F)
A/C Performance Table (1.0L R-134yf)

Ambient Air Temperature Relative Humidity Low Side Service Port Pressure High Side Service Port Pressure Maximum Left Center Discharge Air Temperature
13 - 18°C (55 - 65°F) 0 - 100% 151 - 261 kPa (22 - 38 psi) 923 - 1061 kPa (134 - 154 psi) 9°C (48°F)
19 - 24°C (66 - 75°F) Below 40% 151 - 254 kPa (22 - 37 psi) 1047 - 1233 kPa (152 - 179 psi) 8°C (45°F)
Above 40% 172 - 303 kPa (25 - 44 psi) 1019 - 1178 kPa (148 - 171 psi) 12°C (52°F)
25 - 29°C (76 - 85°F) Below 35% 179 - 275 kPa (26 - 40 psi) 1171 - 1336 kPa (170 - 194 psi) 9°C (48°F)
35 - 50% 206 - 289 kPa (30 - 42 psi) 1150 - 1322 kPa (167 - 192 psi) 12°C (52°F)
Above 50% 227 - 316 kPa (33 - 46 psi) 1136 - 1281 kPa (165 - 186 psi) 13°C (55°F)
30 - 35°C (86 - 95°F) Below 30% 220 - 310 kPa (32 - 45 psi) 1281 - 1467 kPa (186 - 213 psi) 13°C (55°F)
30 - 50% 234 - 323 kPa (34 - 47 psi) 1260 - 1440 kPa (183 - 209 psi) 14°C (57°F)
Above 50% 254 - 344 kPa (37 - 50 psi) 1240 - 1398 kPa (180 - 203 psi) 15°C (59°F)
36 - 41°C (96 - 105°F) Below 20% 261 - 351 kPa (38 - 51 psi) 1419 - 1612 kPa (206 - 234 psi) 17°C (61°F)
20 - 40% 268 - 358 kPa (39 - 52 psi) 1398 - 1577 kPa (203 - 229 psi) 17°C (61°F)
Above 40% 282 - 365 kPa (41 - 53 psi) 1378 - 1550 kPa (200 - 225 psi) 18°C (63°F)
42 - 46°C (106 - 115°F) Below 20% 310 - 385 kPa (45 - 56 psi) 1550 - 1722 kPa (225 - 250 psi) 19°C (66°F)
Above 20% 310 - 385 kPa (45 - 56 psi) 1529 - 1688 kPa (222 - 245 psi) 19°C (66°F)
47 - 49°C (116 - 120°F) Below 30% 344 - 420 kPa (50 - 61 psi) 1639 - 1812 kPa (238 - 263 psi) 23°C (72°F)
A/C Performance Table (1.4L R-134a)

Ambient Air Temperature Relative Humidity Low Side Service Port Pressure High Side Service Port Pressure Maximum Left Center Discharge Air Temperature
13 - 18°C (55 - 65°F) 0 - 100% 151 - 248 kPa (22 - 36 psi) 909 - 1329 kPa (132 - 193 psi) 8°C (45°F)
19 - 24°C (66 - 75°F) Below 40% 158 - 261 kPa (23 - 38 psi) 978 - 1398 kPa (142 - 203 psi) 10°C (50°F)
Above 40% 179 - 289 kPa (26 - 42 psi) 1088 - 1529 kPa (158 - 222 psi) 13°C (55°F)
25 - 29°C (76 - 85°F) Below 35% 206 - 296 kPa (30 - 43 psi) 1240 - 1577 kPa (180 - 229 psi) 13°C (55°F)
35 - 50% 220 - 303 kPa (32 - 44 psi) 1302 - 1612 kPa (189 - 234 psi) 13°C (55°F)
Above 50% 227 - 323 kPa (33 - 47 psi) 1350 - 1688 kPa (196 - 245 psi) 15°C (59°F)
30 - 35°C (86 - 95°F) Below 30% 241 - 330 kPa (35 - 48 psi) 1446 - 1798 kPa (210 - 261 psi) 17°C (61°F)
30 - 50% 248 - 344 kPa (36 - 50 psi) 1481 - 1832 kPa (215 - 266 psi) 18°C (63°F)
Above 50% 261 - 358 kPa (38 - 52 psi) 1529 - 1880 kPa (222 - 273 psi) 20°C (68°F)
36 - 41°C (96 - 105°F) Below 20% 282 - 372 kPa (41 - 54 psi) 1681 - 2018 kPa (244 - 293 psi) 19°C (66°F)
20 - 40% 289 - 378 kPa (42 - 55 psi) 1701 - 2039 kPa (247 - 296 psi) 22°C (70°F)
Above 40% 296 - 385 kPa (43 - 56 psi) 1729 - 2060 kPa (251 - 299 psi) 23°C (72°F)
42 - 46°C (106 - 115°F) Below 20% 323 - 406 kPa (47 - 59 psi) 1929 - 2218 kPa (280 - 322 psi) 23°C (72°F)
Above 20% 330 - 413 kPa (48 - 60 psi) 1942 - 2232 kPa (282 - 324 psi) 24°C (75°F)
47 - 49°C (116 - 120°F) Below 30% 365 - 440 kPa (53 - 64 psi) 2142 - 2418 kPa (311 - 351 psi) 27°C (79°F)
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