MANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7B–9
DAEWOO M-150 BL2
Insufficient Cooling Diagnosis (Cont’d)
Step
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
ÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁÁ
Action
Value(s)
Yes
No
12
Repair the electrical circuit to the A/C compressor
clutch coil.
Does the A/C clutch engage?
–
Go to Step 20 Go to Step 13
13
Replace the A/C compressor clutch coil.
Does the A/C clutch engage?
–
Go to Step 9 Go to Step 10
14
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.
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?
–
Go to Step 16 Go to Step 15
15
1. Recover the A/C system refrigerant.
2. Replace the expansion valve as needed.
3. Evacuate and recharge the A/C system.
4. Check the A/C system for leaks.
5. Note the discharge air temperature with the A/C
ON.
Is the discharge temperature normal?
–
Go to Step16 Go to Step 18
16
Feel the liquid pipe between the condenser and the
expansion valve.
Is the pipe cold?
–
Go to Step 19 Go to Step 17
17
1. Remove the restriction of the high pressure side.
2. Check the A/C system for leaks.
Is the repair complete?
–
System OK
–
18
1. Recover the A/C system refrigerant.
2. Evacuate and recharge the A/C system.
3. Check the A/C system for leaks.
Is the repair complete?
–
System OK
–
19
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.
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?
Low Side
Pressure:
200 kPa
(29 psi)
High Side
Pressure:
1,500 kPa
(217.5 psi)
System OK Go to Step 22
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