Daewoo MATIZ Service Manual page 791

MANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7B – 9
Step
Repair the electrical circuit to the A/C compressor
clutch coil.
12
Does the A/C clutch engage?
Replace the A/C compressor clutch coil.
13
Does the A/C clutch engage?
Important: Perform this test under garage condi-
tions; 21-32_C (70-90_F) and no sun load. Follow
this test carefully for accurate results.
1. Close all of the windows and the doors of the
vehicle.
2. Set the A/C controls to the following positions:
D The A/C switch to the ON position.
D The fresh air control switch to fresh air.
14
D The blower motor to 4.
D The temperature to full cold.
3. Start the engine and follow it to run at idle for
5 minutes.
4. Feel the evaporator inlet and outlet pipes.
Is there a noticeable difference in the temperature of
the evaporator inlet and outlet pipes?
1. Recover the A/C system refrigerant.
2. Replace the expansion valve as needed.
3. Evacuate and recharge the A/C system.
15
4. Check the A/C system for leaks.
5. Note the discharge air temperature with the A/C
ON.
Is the discharge temperature normal?
Feel the liquid pipe between the condenser and the
expansion valve.
16
Is the pipe cold?
1. Remove the restriction of the high pressure side.
17 2. Check the A/C system for leaks.
Is the repair complete?
1. Recover the A/C system refrigerant.
2. Evacuate and recharge the A/C system.
18
3. Check the A/C system for leaks.
Is the repair complete?
1. Run the engine at 3,000 rpm.
2. Close all of the windows and doors of the vehicle.
3. Set the A/C controls to the following positions:
D The A/C switch to the ON position.
D The fresh air control switch to fresh air.
19 D The blower motor to 4.
D The temperature to full cold.
4. Turn the A/C switch ON and OFF every
20 seconds for 3 minutes.
Are the A/C compressor high and the low side
pressures within the specified value of each other?
DAEWOO M-150 BL2
Insufficient Cooling Diagnosis (Cont'd)
Action Value(s) Yes
–
Go to Step 20
–
Go to Step 9
–
Go to Step 16
–
Go to Step16
–
Go to Step 19
–
System OK
–
System OK
Low Side
Pressure:
200 kPa
(29 psi)
High Side
Pressure:
1,500 kPa
(217.5 psi)
System OK
No
Go to Step 13
Go to Step 10
Go to Step 15
Go to Step 18
Go to Step 17
–
–
Go to Step 22