Service Information

Captiva

Air Conditioning (A/C) System Performance Test

Table 1:

A/C Performance Table

Test Description

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

Important:

•	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.

Park the vehicle inside or in the shade.
Open the windows in order to ventilate the interior of the vehicle.
If the A/C system was operating, allow the A/C system to equalise for about 5 minutes.
Turn OFF the ignition.
Install the J 43600 ACR 2000 Air Conditioning Service Centre.
Record the ambient air temperature displayed on the J 43600.
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

Important:

•	If DTC B0157 is set, the compressor clutch will not engage until it is cleared.

•	Record the relative humidity and the ambient air temperature at the time of the test.

Close the vehicle doors and windows.
Open the driver door window 5-6 inches (12.7-15.24 cm).
Start the engine.
Use a scan tool to clear any DTCs stored in the HVAC module.
Select the following HVAC control settings:

•	The A/C is ON

•	The maximum blower speed

•	The Face mode

•	The coldest temperature setting

•	Passenger setting is off

•	All A/C outlets are OPEN

Install the temperature probes of the J 43600 in the left and right centre A/C air outlets.
Apply the handbrake.
Place the transaxle/transmission in one of the following positions:

•	PARK, Automatic

•	NEUTRAL, Manual

Operate the A/C system for 5 minutes.
Inspect A/C components for the following conditions:

•	Abnormal frost areas

•	Unusual noises

Important: Ensure that the compressor is engaged when taking the data.

Press the RESET button before using the print function of the J 43600 .

Print the following information:

•	The outlet air temperatures

•	The low-side pressure

•	The high-side pressure

Compare the low and high side pressures and the output temperatures to the A/C Performance Table.

Does all the data recorded fall within the specified ranges of the A/C Performance Table?

Go to Step 8

Go to Step 3

If the pressures and temperatures recorded do not fall within the specified ranges of the A/C Performance Table:

Continue to operate the A/C system for an additional 5 minutes.
RESET the J 43600 and record the pressures and temperatures again.
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?

Go to Step 8

Go to Step 4

See the A/C system Pressure - Zone Classification chart.

Do the high and low side pressures fall within the specified ranges, but the outlet temperatures do not?

Go to Air Conditioning (A/C) Diagnostics - Pressure Zone A

Go to Step 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 Air Conditioning (A/C) Diagnostics - Pressure Zone B

Go to Step 6

Are the low and high side pressures both greater than the specified ranges?

Go to Air Conditioning (A/C) Diagnostics - Pressure Zone C

Go to Step 7

Is the high side pressure greater than or within the specified range, but the low side pressure is less than the specified range?

Go to Air Conditioning (A/C) Diagnostics - Pressure Zone D

Go to Step 8

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 System Pressure-Zone Classification(s)

A/C Performance Table

Ambient Air Temperature	Relative Humidity	Service Port Pressure		Maximum Left Center Discharge Air Temperature	Maximum Left Rear Discharge Air Temperature
Ambient Air Temperature	Relative Humidity	Low Side Service Port Pressure	High Side Service Port Pressure	Maximum Left Center Discharge Air Temperature	Maximum Left Rear Discharge Air Temperature
13-18°C (55-65°F)	0-100%	151-234 kPa (22-34 psi)	999-1260 kPa (145-183 psi)	10°C (48°F)	12°C (52°F)
19-24°C (66-75°F)	Below 40%	151-241 kPa (22-35 psi)	1040-1309 kPa (151-190 psi)	12°C (52°F)	13°C (54°F)
19-24°C (66-75°F)	Above 40%	172-261 kPa (25-38 psi)	1102-1391 kPa (160-202 psi)	13°C (55°F)	14°C (57°F)
25-29°C (76-85°F)	Below 35%	186-261 kPa (27-38 psi)	1191-1412 kPa (173-205 psi)	13°C (55°F)	14°C (57°F)
	35-50%	199-268 kPa (29-39 psi)	1219-1440 kPa (177-209 psi)	13°C (55°F)	15°C (59°F)
	Above 50%	206-282 kPa (30-41 psi)	1247-1488 kPa (181-216 psi)	15°C (59°F)	18°C (63°F)
30-35°C (86-95°F)	Below 30%	206-289 kPa (30-42 psi)	1302-1543 kPa (189-224 psi)	15°C (59°F)	18°C (63°F)
	30-50%	220-296 kPa (32-43 psi)	1322-1570 kPa (192-228 psi)	17°C (61°F)	18°C (64°F)
	Above 50%	227-303 kPa (33-44 psi)	1357-1612 kPa (197-234 psi)	18°C (64°F)	20°C (68°F)
36-41°C (96-105°F)	Below 20%	241-316 kPa (35-46 psi)	1433-1660 kPa (208-241 psi)	18°C (63°F)	20°C (68°F)
	20-40%	241-316 kPa (35-46 psi)	1440-1681 kPa (209-244 psi)	18°C (64°F)	22°C (70°F)
	Above 40%	248-323 kPa (36-47 psi)	1467-1708 kPa (213-248 psi)	19°C (66°F)	23°C (72°F)
42-46°C (106-115°F)	Below 20%	268-337 kPa (39-49 psi)	1557-1770 kPa (226-257 psi)	20°C (68°F)	23°C (72°F)
42-46°C (106-115°F)	Above 20%	275-344 kPa (40-50 psi)	1577-1791 kPa (229-260 psi)	22°C (70°F)	23°C (73°F)
47-49°C (116-120°F)	Below 30%	303-365 kPa (44-53 psi)	1688-1887 kPa (245-274 psi)	23°C (72°F)	24°C (75°F)