Important: 

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 39500-B ACR4-Black Shroud.
6. Record the ambient air temperature displayed on the J 39500-B .
7. 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

2

Important: 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 5-6 inches.
3. Select the following HVAC control settings:
4. A/C in recirculation mode

•	The A/C is ON

•	The maximum blower speed

•	The panel mode

•	The coldest temperature setting

•	All A/C outlets are OPEN

5. Install the temperature probes of the J 39500-B in the left and right center A/C air outlets.
6. Apply the parking brake.
7. Place the transaxle/transmission in one of the following positions:

•	PARK (Automatic)

•	NEUTRAL (Manual)

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

•	Abnormal frost areas

•	Unusual noises

11. Record the following information:

•	The outlet air temperatures

•	The low-side pressure

•	The high-side pressure

12. Compare the low and high side pressures and the output temperatures to the table below.

Does all the data recorded fall within the specified ranges of the table below?

--

Go to Step 8

Go to Step 3

3

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

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 table below.

Does all the data recorded fall within the specified ranges of the table below?

--

Go to Step 8

Go to Step 4

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 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