Air Conditioning (A/C) System Performance Test. HUMMER H3 2008

For 1990-2009 cars only

Makes 🢒 HUMMER 🢒 2008 🢒 H3 🢒 HVAC 🢒 HVAC - Manual 🢒 Air Conditioning (A/C) System Performance Test

Table 1:

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

Test Description

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 upon completion of 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 equalize for about 2 minutes.
Turn OFF the ignition.
Install the J 43600 ACR 2000 Air Conditioning Service Center.
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 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.

Close the vehicle doors and windows.
Open the driver door window 12.7-15.2 cm (5-6 in).
Select the following HVAC control settings:

•	The A/C is ON.

•	The coldest temperature setting

•	The maximum blower speed

•	Recirculation mode

•	The I/P panel outlet mode

•	All I/P panel outlets are OPEN

Install the temperature probes of the J 43600 in the left and right center panel air outlets.
Apply the parking brake.
Place the transaxle/transmission in one of the following positions:

•	PARK (Automatic)

•	NEUTRAL (Manual)

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

•	Abnormal frost areas

•	Unusual noises

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

Print the following information:

•	The panel outlet air temperatures

•	The low side pressure

•	The high side pressure

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 8

Go to Step 3

If the pressures and temperatures recorded do not fall within the specified ranges:

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 panel output temperature 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 4

Do the high and low side pressures fall within the specified ranges, but the panel 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 the specified range, but the low side pressure is within or 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 - Manual

A/C Performance Table

Ambient 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%	151-186 kPa (22-27 psi)	778-1136 kPa (112-165 psi)	9°C (48°F)
19-24°C (66-75°F)	Below 40%	151-213 kPa (22-31 psi)	971-1357 kPa (141-197 psi)	9°C (48°F)
19-24°C (66-75°F)	Above 40%	151-241 kPa (22-35 psi)	1012-1412 kPa (147-205 psi)	12°C (52°F)
25-29°C (76-85°F)	Below 35%	151-241 kPa (22-35 psi)	1247-1577 kPa (181-229 psi)	12°C (52°F)
	35-50%	165-254 kPa (24-37 psi)	1267-1598 kPa (184-232 psi)	13°C (54°F)
	Above 50%	179-268 kPa (26-39 psi)	1288-1639 kPa (187-238 psi)	13°C (55°F)
30-35°C (86-95°F)	Below 30%	192-282 kPa (28-41 psi)	1481-1853 kPa (215-269 psi)	14°C (57°F)
	30-50%	199-296 kPa (29-43 psi)	1502-1867 kPa (218-271 psi)	15°C (59°F)
	Above 50%	213-310 kPa (31-45 psi)	1522-1908 kPa (221-277 psi)	17°C (61°F)
36-41°C (96-105°F)	Below 20%	227-316 kPa (33-46 psi)	1743-2108 kPa (253-306 psi)	18°C (63°F)
	20-40%	234-330 kPa (34-48 psi)	1756-2129 kPa (255-309 psi)	18°C (64°F)
	Above 40%	248-337 kPa (36-49 psi)	1777-2156 kPa (258-313 psi)	18°C (64°F)
42-46°C (106-115°F)	Below 20%	275-351 kPa (40-51 psi)	2018-2342 kPa (293-340 psi)	20°C (68°F)
42-46°C (106-115°F)	Above 20%	275-365 kPa (40-53 psi)	2032-2363 kPa (295-343 psi)	20°C (68°F)
47-49°C (116-120°F)	Below 30%	316-392 kPa (46-57 psi)	2259-2569 kPa (328-373 psi)	23°C (73°F)

A/C System Pressure Zone Classification