Table 1: | A/C Performance Table |
This test measures the operating efficiency of the A/C system under the following conditions:
• | The current ambient air temperature |
• | The current relative humidity |
• | The high side pressure of the A/C system |
• | The low side pressure of the A/C system |
• | The temperature of the air being discharged into the passenger compartment |
The numbers below refer to the step numbers on the diagnostic table.
This step determines if the A/C system has at least the minimum refrigerant charge required to operate the system without damage.
This step measures the performance of the A/C system.
This step is to allow for vehicle variations as well as high ambient temperatures.
Step | Action | Values | Yes | No | ||||||||||||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Important:
| ||||||||||||||||||||||||||||
Are both the low side and high side pressures within 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 | |||||||||||||||||||||||||
Important: Record the relative humidity and the ambient air temperature at the time of the test.
Does all the data recorded fall within the specified ranges of the table below? | -- | Go to Step 8 | Go to Step 3 | |||||||||||||||||||||||||
If the pressures and temperatures recorded do not fall within the specified ranges:
Does all the data recorded fall within the specified ranges of the table below? | -- | Go to Step 8 | Go to Step 4 | |||||||||||||||||||||||||
4 | Do the high and low side pressures fall within the specified ranges, but the outlet temperatures do not? | -- | Go to Step 5 | |||||||||||||||||||||||||
5 | Is the low side pressure greater than the specified range, but the high side pressure within or less than the specified range? | -- | Go to Step 6 | |||||||||||||||||||||||||
6 | Are the low and high side pressures both greater than the specified ranges? | -- | Go to Step 7 | |||||||||||||||||||||||||
7 | Is the high side pressure greater than the specified range, but the low side pressure is within or less than the specified range? | -- | Go to Step 8 | |||||||||||||||||||||||||
8 | Operate the system in order to verify the test results. Did you find the same results? | -- | System OK |
Ambient Air Temperature | Relative Humidity | Service Port Pressure | Maximum Left Center Discharge Air Temperature | |
---|---|---|---|---|
Low Side | High Side | |||
13-18°C (55-65°F) | 0-100% | 175-219 kPa (25-32 psi) | 610-920 kPa (89-134 psi) | 13°C (55°F) |
19-24°C (66-75°F) | Below 40% | 175-254 kPa (25-37 psi) | 740-1070 kPa (107-155 psi) | 15°C (59°F) |
Above 40% | 175-285 kPa (25-41 psi) | 790-1140 kPa (115-166 psi) | 17°C (63°F) | |
25-29°C (77-84°F) | Below 35% | 195-291 kPa (28-42 psi) | 950-1240 kPa (138-180 psi) | 18°C 64°F) |
35-60% | 211-305 kPa (31-44 psi) | 980-1260 kPa (142-183 psi) | 18°C (64°F) | |
Above 60% | 222-332 kPa (32-48 psi) | 1010-1310 kPa (147-190 psi) | 20°C (68°F) | |
30-35°C (86-95°F) | Below 30% | 232-333 kPa (34-48 psi) | 1120-1430 kPa (163-208 psi) | 20°C (68°F) |
30-50% | 246-355 kPa (36-52 psi) | 1150-1470 kPa (167-213 psi) | 22°C (72°F) | |
Above 50% | 265-389 kPa (39-57 psi) | 1180-1530 kPa (171-222 psi) | 24°C (75°F) | |
36-41°C (97-106°F) | Below 20% | 271-367 kPa (39-53 psi) | 1320-1620 kPa (192-235 psi) | 22°C (72°F) |
20-40% | 282-393 kPa (41-57 psi) | 1330-1660 kPa (193-241 psi) | 24°C (75°F) | |
Above 40% | 314-405 kPa (46-59 psi) | 1520-1790 kPa (221-260 psi) | 26°C (77°F) | |
42-46°C (108-115°F) | Below 20% | 314-405 kPa (46-59 psi) | 1520-1790 kPa (221-260 psi) | 25°C (77°F) |
Above 20% | 327-434 kPa (48-63 psi) | 1540-1830 kPa (224-266 psi) | 27°C (81°F) | |
47-49°C (117-120°F) | Below 30% | 365-443 kPa (53-64 psi) | 1710-1910 kPa (248-277 psi) | 27°C (81°F) |