Daewoo Nubira Owner's Manual page 465

7B – 16IMANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM
Step
24
1. Start the engine.
2. Observe the low–side pressure gauge while
running the engine between 3,000 and 3,800
rpm.
Does the low–side pressure rise rapidly?
25
1. Recover the A/C system refrigerant.
2. Replace the A/C compressor.
3. Evacuate and recharge the A/C system.
Is the compressor functioning normally?
26 Check the low–side pressure.
Is the low–side pressure within the specified value?
27 Feel the high–side pipe leading up to the expansion
valve connecting block.
Is the pipe cold before the connecting block?
28
1. Check for a restriction in the high–side pipe
before the expansion valve.
2. Repair or replace the high–side pipe.
Is the repair complete?
29 Add the specified amount of refrigerant to the A/C
system.
Does the cooling performance improve?
30
1. Check the A/C system for leaks.
2. Repair any refrigerant leaks, as needed.
3. Evacuate and recharge the A/C system.
4. Check the A/C system for leaks.
Is the system free from leaks?
31
1. Recover the refrigerant.
2. Check the expansion valve for obstructions.
3. Repair or replace the expansion valve, as re-
quired.
4. Evacuate and recharge the system.
5. Check the A/C system for leaks.
Is the system free from leaks?
32
1. Run the engine for 5 minutes at 2,000 rpm.
2. Set the A/C controls to the following positions:
S The A/C to ON.
S The fresh air control switch to recirculate
(indicator lamp ON).
S The blower motor to 1.
S The temperature control knob to full cold.
3. Close all of the vehicle's windows and doors.
4. Open the vehicle hood.
Is the low–side pressure within the specified value?
33
1. Recover the A/C system refrigerant.
2. Replace the A/C compressor control valve.
3. Evacuate and recharge the A/C system.
4. Check the A/C system for leaks.
Is the system free from leaks?
Action Value(s) Yes
Go to Step 32
Go to Step 13
172–241 kPa Go to Step 27
(27–38 psi)
Go to Step 28
Go toStep 13
0.40 kg (14 oz) Go to Step 30
Go to Step 13
Go to Step 13
172–241 kPa Go to Step 13
(25–35 psi)
Go to Step 13
No
Go to Step 25
Go to Step 32
Go to Step 29
Go to Step 31
Go to Step 33
DAEWOO V–121 BL4