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

WARNING: This page is about a different car, the 2009 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

Step	Action	Value	Yes	No
DEFINITION: The high and low side pressures may be normal or slightly less than normal. Air Delivery Concern Slight Refrigerant Under Charge Refrigerant Contamination
1	Were you sent here from the air conditioning (A/C) System Performance Test?	-	Go to Step 2	Go to Air Conditioning (A/C) System Performance Test (LY7) or Air Conditioning (A/C) System Performance Test (LZ4) or Air Conditioning (A/C) System Performance Test (LE5) or Air Conditioning (A/C) System Performance Test (LY7 Red Line) or Air Conditioning (A/C) System Performance Test (LAT Green Line) or Air Conditioning (A/C) System Performance Test (HP5)
2	Refer to the instrument panel outlet air temperatures recorded during the A/C system performance test. Does the discharge air temperature between the right and left center instrument panel outlets vary by more than 1-2°C (2-3°F)?	-	Go to Step 7	Go to Step 3
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
4	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 (without HP5) or Air Conditioning (A/C) Diagnostics - Pressure Zone D (with HP5)	Go to Step 5
5	Refer to the pressures recorded during the A/C system performance test. Inspect for the following conditions: WARNING: Refer to Moving Parts and Hot Surfaces Warning . 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 (LY7) Air Conditioning (A/C) System Performance Test (LZ4) Air Conditioning (A/C) System Performance Test (LE5) Air Conditioning (A/C) System Performance Test (LY7 Red Line) Air Conditioning (A/C) System Performance Test (LAT Green Line) Air Conditioning (A/C) System Performance Test (HP5) . The discharge line is hot. The suction line is cool. Do the listed conditions exist?	-	Go to Step 7	Go to Step 6
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 (LY7) Air Conditioning (A/C) System Performance Test (LZ4) Air Conditioning (A/C) System Performance Test (LE5) Air Conditioning (A/C) System Performance Test (LY7 Red Line) Air Conditioning (A/C) System Performance Test (LAT Green Line) Air Conditioning (A/C) System Performance Test (HP5) . 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
7	The A/C system may be undercharged. Leak test A/C system. Refer to Leak Testing (With HP5) or Leak Testing (Without HP5) . Recharge the A/C system to specifications. Refer to Refrigerant Recovery and Recharging (With HP5) or Refrigerant Recovery and Recharging (Without HP5) . Is the action complete?	-	Go to Step 14	-
8	The A/C system may be contaminated. View the information screen on J 43600 for detection of foreign gases in the A/C system. See Special Tools . Do foreign gases exist?	-	Go to Step 9	Go to Step 10
9	Evacuate the A/C system to a scavenging tank. Refer to Refrigerant Recovery and Recharging (With HP5) or Refrigerant Recovery and Recharging (Without HP5) . Recharge the A/C system to specifications. Is the action complete?	-	Go to Step 14	-
10	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 (With HP5) or Refrigerant Recovery and Recharging (Without HP5) . Operate the A/C system and inspect the instrument panel outlet air temperatures. Refer to Air Conditioning (A/C) System Performance Test (LY7) or Air Conditioning (A/C) System Performance Test (LZ4) or Air Conditioning (A/C) System Performance Test (LE5) or Air Conditioning (A/C) System Performance Test (LY7 Red Line) or Air Conditioning (A/C) System Performance Test (LAT Green Line) or Air Conditioning (A/C) System Performance Test (HP5) . Are the instrument panel outlet air temperatures within the specified ranges of the A/C Performance Test Table?	-	Go to Step 15	Go to Step 11
11	The A/C system may contain too much refrigerant oil. NOTE: 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 (With HP5) or Refrigerant Recovery and Recharging (Without HP5) . Remove the refrigerant desiccant. Refer to Air Conditioning Refrigerant Desiccant Replacement . Drain and measure the refrigerant oil from the refrigerant desiccant tube. Was more than the specified amount of refrigerant oil drained from the refrigerant desiccant tube?	148 ml (5 oz)	Go to Step 12	Go to Step 13
12	Reinstall the refrigerant desiccant. Refer to Air Conditioning Refrigerant Desiccant Replacement . Recharge the A/C system. Refer to Refrigerant Recovery and Recharging (With HP5) or Refrigerant Recovery and Recharging (Without HP5) . Are the actions complete?	-	Go to Step 14	-
13	Add the specified amount of refrigerant oil to the system. Refer to Refrigerant System Capacities (With HP5) or Refrigerant System Capacities (Without HP5) . Install the refrigerant desiccant. Refer to Air Conditioning Refrigerant Desiccant Replacement . Recharge the A/C system. Refer to Refrigerant Recovery and Recharging (With HP5) or Refrigerant Recovery and Recharging (Without HP5) . Are the actions complete?	-	Go to Step 14	-
14	Record the low and high side pressures and the instrument panel outlet air temperature. Compare the instrument panel outlet air temperatures to those listed in the A/C System Performance Chart. Refer to Air Conditioning (A/C) System Performance Test (LY7) or Air Conditioning (A/C) System Performance Test (LZ4) or Air Conditioning (A/C) System Performance Test (LE5) or Air Conditioning (A/C) System Performance Test (LY7 Red Line) or Air Conditioning (A/C) System Performance Test (LAT Green Line) or Air Conditioning (A/C) System Performance Test (HP5) . Are the high and low side pressures and instrument panel outlet air temperatures within specifications?	-	Go to Step 15	Go to Air Conditioning (A/C) System Performance Test (LY7) or Air Conditioning (A/C) System Performance Test (LZ4) or Air Conditioning (A/C) System Performance Test (LE5) or Air Conditioning (A/C) System Performance Test (LY7 Red Line) or Air Conditioning (A/C) System Performance Test (LAT Green Line) or Air Conditioning (A/C) System Performance Test (HP5)
15	Operate the system in order to verify the repair. Did you find and correct the condition?	-	System OK	Go to Symptoms - HVAC Systems - Manual or Symptoms - HVAC Systems - Automatic .