Daewoo Nubira Owner's Manual page 464

MANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7B – 15
Step
15
1. Record the high– and low–side pressures after
the A/C system has been operating for 5 min-
utes or more with the engine cooling fan ON.
2. Locate the intersection of the high– and low–
side pressures. Refer to "Low– and High–Side
Pressure Relationship Chart" in this section.
Do the low– and high–side pressures intersect in the
white area of the chart?
16 Check the high– and low–side pressures.
Do the high– and low–side pressures intersect in the
gray area of the chart?
17 Feel the liquid pipe between the condenser and the
expansion valve.
Is the pipe cold?
18
1. Examine the condenser for any restriction of
the airflow.
2. Check the cooling fans for proper operation.
3. Remove the restriction or repair the fans, as
required.
Is the pipe temperature normal?
19
1. Recover, evacuate, and recharge the A/C sys-
tem.
2. Check the A/C system for leaks.
Is the system free from leaks?
20 Observe the readings on the pressure gauges.
Are the A/C compressor high– and low–side pres-
sures within the specified value of each other?
21
1. Run the engine at 3,000 rpm.
2. Set the A/C controls to the following positions:
S The A/C to ON.
S The fresh air control switch to fresh air.
S The blower motor to 4.
S The temperature control knob to full cold.
3. Close all of the vehicle's windows and doors.
4. Turn the A/C ON and OFF every 20 seconds
for 3 minutes.
Are the A/C compressor high– and low–side pres-
sures within the specified value of each other?
22 Observe the pressure rise on both gauges and the
temperatures of both the compressor suction pipe
and the discharge pipe.
Is the pressure rise on both gauges slow and the
suction pipe warm with the discharge pipe very hot?
23
1. Turn the ignition to LOCK.
2. Make sure the compressor clutch is disen-
gaged.
3. Attempt to turn the clutch driver (not the
pulley).
Can you turn the clutch driver freely by hand?
DAEWOO V–121 BL4
Action Value(s) Yes
System OK
Go to Step 17
Go to Step 18
At least 7³C Go to Step 13
(12³F) below
ambient air
temperature
Go to Step 13
207 kPa (30 Go to Step 21
psi)
207 kPa (30 Go to Step 22
psi)
Go to Step 25
Go to Step 25
No
Go to Step 16
Go to Step 20
Go toStep 19
Go to Step 26
Go to Step 13
Go to Step 23
Go to Step 24