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MANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7B – 5
DIAGNOSTIC INFORMATION AND PROCEDURES
TESTING THE REFRIGERANT
SYSTEM
If you suspect a problem in the refrigerant system,
check for the following conditions:
1. Check the outer surfaces of the radiator and the con-
denser cores to be sure that the airflow is not blocked
by dirt, leaves, or other foreign material. Check be-
tween the condenser and the radiator, as well as all
outer surfaces.
2. Check for restrictions or kinks in the condenser core,
the hoses, and the tubes.
3. Check the operation of the blower fan.
4. Check all the air ducts for leaks or restrictions. A low
airflow rate may indicate a restricted evaporator core.
5. Check for slippage of the compressor clutch.
6. Check the drive belt tension.
DAEWOO M-150 BL2
GENERAL DIAGNOSIS
INSUFFICIENT COOLING "QUICK
CHECK" PROCEDURE
Perform the following "hand-feel" procedure to get a
quick idea of whether the air conditioning (A/C) system
has the proper charge of Refrigerant-134a.
1. Warm up the engine. Run the engine at idle.
2. Open the hood and all the doors.
3. Turn the A/C switch ON.
4. Set the temperature control to the full cold position.
5. Set the blower speed switch on 4.
6. "Hand-feel" the temperature of the evaporator outlet
7. Check for other problems. Refer to "Testing the Re-
8. Leak check the system. Refer to "Leak Testing the
9. If there is no leak, refer to "Insufficient Cooling Diag-
pipe. The pipe should be cold.
frigerant System" in this section.
Refrigerant System" in this section. If you find a leak,
discharge the system and repair the leak as required.
After completing the repair, evacuate and charge the
system.
nosis" in this section.
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