Air Conditioning (A/C) Diagnostics - Pressure Zone A. Saturn Astra 2008

For 1990-2009 cars only

Makes 🢒 Saturn 🢒 2008 🢒 Astra 🢒 HVAC 🢒 Heating, Ventilation, and Air Conditioning 🢒 Air Conditioning (A/C) Diagnostics - Pressure Zone A

Step

Action

Value

Yes

DEFINITION: The high and low side pressures may be normal or slightly less than normal.

•	Air Delivery Concern

•	Slight Refrigerant Under Charge

•	Refrigerant Contamination

Were you sent here from the A/C System Performance Test?

Go to Step 2

Go to Air Conditioning (A/C) System Performance Test

Refer to the panel air outlet temperatures recorded during the A/C system performance test.

Does the discharge air temperature between the right and left center panel outlets vary by more than 4°C (5°F)?

Go to Step 7

Go to Step 3

Did the customer mention that the A/C system output temperatures are good at first, but then turn warm during extended drives?

Go to Step 4

Go to Step 5

Increase engine speed to 2,000 RPM.

During extended operation of the A/C system, does the low side pressure decrease, possibly accompanied by heavy frost on the liquid line between the expansion device and the evaporator?

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

Go to Step 5

Refer to the pressures recorded during the A/C system performance test.

Inspect for the following conditions:

Caution: Refer to Moving Parts and Hot Surfaces Caution in the Preface section.

•	The high side pressure is slightly greater than the specified pressure ranges but still within Zone A on the A/C Pressure-Zone Classification Chart in the A/C System Performance Test. Refer to Air Conditioning (A/C) System Performance Test.

•	The discharge line is hot.

•	The suction line is cool.

Do the listed conditions exist?

Go to Step 7

Go to Step 6

Refer to the pressures recorded during the A/C system performance test.

Inspect for the following conditions:

•	The low side pressure is slightly lower than the specified pressure ranges but still within Zone A on the A/C Pressure-Zone Classification Chart in the A/C System Performance Test. Refer to Air Conditioning (A/C) System Performance Test.

•	The discharge line is warm-to-hot.

•	The suction line is cool-to-warm.

Do the listed conditions exist?

Go to Step 8

Go to Air Temperature Malfunction

The A/C system may be undercharged.

Leak test A/C system. Refer to Leak Testing.
Recharge the A/C system to specifications. Refer to Refrigerant Recovery and Recharging.

Is the repair complete?

Go to Step 14

The A/C system may be contaminated.

View the J 43600 ACR 2000 information screen for detection of foreign gases in the A/C system.

Do foreign gases exist?

Go to Step 9

Go to Step 10

Evacuate the A/C system to a scavenging tank. Refer to Refrigerant Recovery and Recharging.
Recharge the A/C system to specifications.

Is the repair complete?

Go to Step 14

The A/C system may contain too much moisture or air.

Evacuate and recharge the A/C system to specifications. Refer to Refrigerant Recovery and Recharging.
Operate the A/C system and inspect the panel outlet air temperatures. Refer to Air Conditioning (A/C) System Performance Test.

Are the panel outlet temperatures within the specified ranges of the A/C Performance Test Table?

Go to Step 15

Go to Step 11

The A/C system may contain too much refrigerant oil.

Important: Operate the A/C system on low, in order to enhance oil flow to the high side of the system.

Operate the A/C system with the engine at idle speed and the blower speed on low for approximately 15 minutes.
Recover the refrigerant from the A/C system. Refer to Refrigerant Recovery and Recharging.
Measure the oil recovered by the J 43600 .

Was the amount greater than the specified value?

60 ml (2 oz)

Go to Step 12

Go to Step 13

Recharge the A/C system but do not add the amount of oil recovered by the J 43600 . Refer to Refrigerant Recovery and Recharging.

Are the repairs complete?

Go to Step 14

Recharge the A/C system but do not add the amount of oil recovered by the J 43600 . Refer to Refrigerant Recovery and Recharging.

Are the repairs complete?

Go to Step 14

Record the low and high side pressures and the I/P panel outlet air temperature.
Compare the panel outlet temperatures to those listed in the A/C System Performance Chart. Refer to Air Conditioning (A/C) System Performance Test.

Are the high and low side pressures and I/P panel outlet temperatures within specifications?

Go to Step 15

Go to Air Conditioning (A/C) System Performance Test

Operate the system in order to verify the repair.

Did you find and correct the condition?

System OK

Go to Symptoms - HVAC Systems - Manual