2003 DAEWOO MATIZ air conditioning

HEATING AND VENTILATION SYSTEM 7A–25
DAEWOO M-150 BL2
D18A527B
D18A528B
Installation Procedure
1. Install the heater module with the nuts.
Tighten
Tighten the heater module lower nuts to 3–5 Nm
(27–44 lb-in) (1).
Tighten the heater module upper nuts to 3–5 Nm
(27–44 lb-in) (2).
2. Install the evaporator on the vehicle equipped with
A/C. Refer to Section 7B, Manual Control Heating,
Ventilation, and Air Conditioning System.
3. Install the heater module–to–blower module connec-
tion tube on the vehicle not equipped with A/C with
the screw.
4. Install the instrument panel and the lower tie bar. Re-
fer to Section 9E, Instrumentation/Driver Information.
5. Connect the heater hoses to the heater module. Re-
fer to “Heater Hoses” in this section.
D108A529
D108A530
BLOWER MODULE
(Left–Hand Drive Shown, Right–Hand
Drive Similar)
Removal Procedure
1. Remove the glove box from the instrument panel. Re-
fer to Section 9E, Instrumentation/Driver Information.
2. Remove the heater module–to–blower module con-
nection tube on the vehicle not equipped with A/C.
Refer to “Heater Module” in this section.
3. Remove the evaporator on the vehicle equipped with
A/C. Refer to Section 7B, Manual Control Heating,
Ventilation, and Air Conditioning System.
4. Remove the blower resistor. Refer to “Blower Resis-
tor” in this section.
5. Disconnect the blower motor connector. Refer to
“Blower Motor and Cooling Hose” in this section.
6. Remove the blower module.

Remove the nuts (1).

Disconnect the wiring harness (2).

7A–26 HEATING AND VENTILATION SYSTEM
DAEWOO M-150 BL2
D18A531B
Installation Procedure
1. Install the blower module with the nuts.
Tighten
Tighten the blower module retaining nuts to 3–5 Nm
(27–44 lb-in).
2. Connect the wiring harness.
3. Connect the blower motor connector. Refer to “Blow-
er Motor and Cooling Hose” in this section.
4. Install the blower resistor. Refer to “Blower Resistor”
in this section.
5. Install the evaporator on the vehicle equipped with
A/C. Refer to Section 7B, Manual Control Heating,
Ventilation, and Air Conditioning System.
6. Install the heater module–to–blower module connec-
tion tube on the vehicle not equipped with A/C. Refer
to “Heater Module” in this section.
7. Install the glove box to the instrument panel. Refer to
Section 9E, Instrumentation/Driver Information.
D108A532
DEFROSTER DUCT AND HOSES
(Left–Hand Drive Shown, Right–Hand
Drive Similar)
Removal Procedure
1. Remove the instrument panel. Refer to Section 9E,
Instrumentation/Driver Information.
2. Remove the defroster duct and hoses retaining
screws.
a. Retaining screw.
3. Remove the defroster duct and hoses.
b. Defroster duct and hoses.
D108A533
Installation Procedure
1. Install the defroster duct and hoses with the screws.
2. Install the instrument panel. Refer to Section 9E, In-
strumentation/Driver Information.

DAEWOO M-150 BL2

SECTION 7B
MANUAL CONTROL HEATING, VENTILATION,
AND AIR CONDITIONING SYSTEM
CAUTION: Disconnect the negative battery cable before removing or installing any electrical unit or when a
tool or equipment could easily come in contact with exposed electrical terminals. Disconnecting this cable
will help prevent personal injury and damage to the vehicle. The ignition must also be in B unless otherwise
noted.
TABLE OF CONTENTS
Description and Operation 7B-2. . . . . . . . . . . . . . . . . .
System Components – Functional 7B-2. . . . . . . . . . .
Component Locator 7B-3. . . . . . . . . . . . . . . . . . . . . . . .
A/C System 7B-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostic Information and Procedures 7B-5. . . . .
General Diagnosis 7B-5. . . . . . . . . . . . . . . . . . . . . . . . . . .
Testing the Refrigerant System 7B-5. . . . . . . . . . . . . .
Insufficient Cooling “Quick Check”
Procedure 7B-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Pressure-Temperature Relationship
of R-134a 7B-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Leak Testing the Refrigerant System 7B-7. . . . . . . . .
Air Conditioning System Diagnosis 7B-8. . . . . . . . . . . . .
Insufficient Cooling Diagnosis 7B-8. . . . . . . . . . . . . . .
Symptom Diagnosis 7B-11. . . . . . . . . . . . . . . . . . . . . . . .
Pressure Test Chart (R-134a System) 7B-11. . . . . . .
Repair Instructions 7B-13. . . . . . . . . . . . . . . . . . . . . . . .
On-Vehicle Service 7B-13. . . . . . . . . . . . . . . . . . . . . . . . .
General A/C System Service Procedures 7B-13. . . . . .
O-Ring Replacement 7B-13. . . . . . . . . . . . . . . . . . . . .
Handling Refrigerant 7B-13. . . . . . . . . . . . . . . . . . . . . .
Handling of Refrigerant Lines and Fittings 7B-13. . .
Maintaining Chemical Stability in the
Refrigeration System 7B-14. . . . . . . . . . . . . . . . . . .
Discharging, Adding Oil, Evacuating, and
Charging Procedures for A/C System 7B-14. . . . . Serviceable Components 7B-17. . . . . . . . . . . . . . . . . . . .
Control Assembly and Control Cables 7B-17. . . . . . .
Blower Motor and Cooling Hose 7B-17. . . . . . . . . . . .
Blower Resistor 7B-17. . . . . . . . . . . . . . . . . . . . . . . . . .
Blower Motor Switch 7B-17. . . . . . . . . . . . . . . . . . . . . .
A/C Push Knob 7B-18. . . . . . . . . . . . . . . . . . . . . . . . . .
Receiver–Dryer and Dual Cut Switch 7B-18. . . . . . . .
Receiver–Dryer Bracket 7B-20. . . . . . . . . . . . . . . . . . .
Compressor 7B-20. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Condenser 7B-21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A/C High Pressure Pipe Line 7B-22. . . . . . . . . . . . . . .
A/C Low Pressure Pipe Line 7B-25. . . . . . . . . . . . . . .
Evaporator Unit and Drain Hose 7B-26. . . . . . . . . . . .
Unit Repair 7B-28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Evaporator Core and Expansion Valve 7B-28. . . . . .
Compressor Overhaul 7B-29. . . . . . . . . . . . . . . . . . . . .
Specifications 7B-30. . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Specifications 7B-30. . . . . . . . . . . . . . . . . . . .
Fastener Tightening Specifications 7B-30. . . . . . . . . .
Special Tools and Equipment 7B-31. . . . . . . . . . . . . .
Special Tools Table 7B-31. . . . . . . . . . . . . . . . . . . . . . .
Schematic and Routing Diagrams 7B-32. . . . . . . . . .
A/C Diagrams 7B-32. . . . . . . . . . . . . . . . . . . . . . . . . . . .
A/C Airflow (Typical) 7B-33. . . . . . . . . . . . . . . . . . . . . .
A/C System (Typical) 7B-33. . . . . . . . . . . . . . . . . . . . .

7B–2 MANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM
DAEWOO M-150 BL2
DESCRIPTION AND OPERATION
SYSTEM COMPONENTS
–FUNCTIONAL
Compressor
All compressors are belt–driven from the engine crank-
shaft through the compressor clutch pulley. The com-
pressor pulley rotates without driving the compressor
shaft until on electromagnetic clutch coils energized.
When voltage is applied to energize the clutch coil, the
clutch plate and hub assembly are drawn toward the
pulley. The magnetic force locks the clutch plate and
pulley together as one unit to drive the compressor
shaft.
Condenser Core
The condenser assembly in front of the radiator consists
of coils which carry the refrigerant and cooling fins that
provide the rapid transfer of heat. The air passing
through the condenser cools the high–pressure refriger-
ant vapor and cause it to condense into a liquid.
Expansion Valve
The expansion valve is located on the passenger
compartment side of the dash panel. The expansion
valve can fail in three different positions: open, closed,
or restricted. An expansion valve that fails in the open
position will result in a noisy A/C compressor or no cool-
ing. The cause can be a broken spring, a broken ball, or
excessive moisture in the A/C system. If the spring or
the ball is found to be detective, replace the expansion
valve. If excessive moisture is found in the A/C system,
recycle the refrigerant. An expansion valve that fails in
the closed position will result in low suction pressure and
no cooling. This may be caused by a failed power done
or excessive moisture in the A/C system. If the power
dome on the expansion valve is found to be defective,
replace the expansion valve. If excessive moisture is
found in the A/C system, recycle the refrigerant.
A restricted expansion valve will result in low suction
pressure and no cooling. This may be caused by debrisin the refrigerant system. If debris is believed to be
cause, recycle the refrigerant, replace the expansion
valve, and replace the receiver/dryer.
Evaporator Core
The evaporator is device which cools and dehumidifies
the air before it enters the vehicle. High–pressure liquid
refrigerant flows through the expansion tube (orifice)
and becomes a low–pressure gas in the evaporator. The
heat in the air passing through the evaporator core is
transferred to the cooler surface of the core, which cools
the air. As the process of heat transfer from the air to the
evaporator core surface is taking place, any moisture
(humidity) in the air condenses on the outside surface of
the evaporator core and is drained off as water.
Receiver–Dryer
The sealed receiver–dryer assembly is connected to the
evaporator outlet pipe. It acts as a refrigerant storing
container, receiving liquid and some vapor and refriger-
ant oil from the evaporator.
At the bottom the receiver–dryer is the desiccant, which
acts as a drying agent for the moisture that may have
entered the system. The receiver–dryer is serviceable
only as an assembly.
Dual Cut Switch
The dual cut switch controls compressor operation when
the cycling refrigerant pressure is dropped or surged.
Evaporator Thermistor
A semiconductor which resistance is noticeably changed
as the change of temperature. When the refrigerant tem-
perature of the evaporator drops to 0
C (32
F) and be-
low, the evaporator cores get stuck with frost or ice,
reducing the airflow, lowering the cooling capacity. The
thermistor is a sensor which is used to prevent from frost-
ing or icing.
The thermistor is installed on the evaporator.

MANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7B–3
DAEWOO M-150 BL2
COMPONENT LOCATOR
A/C SYSTEM
(Left–Hand Drive Shown, Right–Hand Drive Similar)
D18B401B

7B–4 MANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM
DAEWOO M-150 BL2
1. High Pressure Pipe
(Receiver Dryer→Evaporator)
2. Low Pressure Hose
(Evaporator→Compressor)
3. O–ring
4. Evaporator Module
5. Evaporator Upper Case
6. thermistor
7. Evaporator Core
8. Expansion Valve
9. Evaporator Inlet Pipe
10. Plate
11. Evaporator Lower Case
12. O–ring
13. High Pressure Pipe
(Compressor→Condenser)14. Compressor
15. Compressor Magnetic Clutch
16. Compressor Pulley
17. Compressor Clutch Drive
18. Shaft Bolt
19. High Pressure Pipe
(Condenser→Receiver–Dryer)
20. Condenser
21. Receiver–Dryer
22. Dual Cut Switch
23. Receiver–Dryer Bracket
24. Compressor Bracket
25. Compressor Stay
26. A/C & Power Steering Bracket

MANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM 7B–5
DAEWOO M-150 BL2
DIAGNOSTIC INFORMATION AND PROCEDURES
GENERAL DIAGNOSIS
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.
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
pipe. The pipe should be cold.
7. Check for other problems. Refer to “Testing the Re-
frigerant System” in this section.
8. Leak check the system. Refer to “Leak Testing the
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.
9. If there is no leak, refer to “Insufficient Cooling Diag-
nosis” in this section.

7B–6 MANUAL CONTROL HEATING, VENTILATION, AND AIR CONDITIONING SYSTEM
DAEWOO M-150 BL2
PRESSURE-TEMPERATURE RELATIONSHIP OF R-134A


TEMPERATURE

C (
F)*

PRESSURE
kPa (psig)*

TEMPERATURE

C (
F)*

PRESSURE
kPa (psig)*
–8.89 (16) 105.70 (15.33) 37.78 (100) 856.84 (124.27)
–7.78 (18) 114.87 (16.66) 38.89 (102) 886.56 (128.58)
–6.67 (20) 124.32 (18.03) 40.00 (104) 916.35 (132.98)
–5.56 (22) 134.11 (19.45) 41.11 (106) 947.92 (137.48)
–4.44 (24) 144.24 (20.92) 42.22 (108) 979.64 (142.08) –3.33 (26) 154.65 (22.43) 43.33 (110) 1012.11 (146.79) –2.22 (28) 165.48 (24.00) 44.44 (112) 1045.21 (151.59)
–1.11 (30)

176.65 (25.62)

45.56 (114)

1079.14 (156.51)
0.00 (32) 188.16 (27.29) 46.67 (116) 1113.75 (161.53)
1.11 (34) 200.02 (29.01) 47.78 (118) 1149.12 (166.66)
2.22 (36) 212.30 (30.79) 48.89 (120) 1185.18 (171.89)
3.33 (38) 224.98 (32.63) 50.00 (122) 1222.07 (177.24)
4.44 (40) 238.08 (34.53) 51.11 (124) 1259.72 (182.70)
7.22 (45) 272.49 (39.52) 52.22 (126) 1298.12 (188.27)
10.00 (50) 309.58 (44.90) 53.33 (128) 1337.35 (193.96) 12.77 (55) 349.51 (50.69) 54.44 (130) 1377.35 (199.76) 15.56 (60) 392.33 (56.90) 57.22 (135) 1480.91 (214.78)
18.33 (65)

438.18 (63.55)

60.00 (140)

1589.57 (230.54)
21.11 (70) 487.27 (70.67) 62.78 (145) 1703.62 (247.08)
23.89 (75) 539.67 (78.27) 65.56 (150) 1823.04 (264.40)
26.67 (80) 609.38 (88.38) 68.33 (155) 1948.04 (282.53)
29.44 (85) 655.09 (95.01) 71.11 (160) 2078.77 (301.49)
32.22 (90) 718.39 (104.19) 73.89 (165) 2215.29 (321.29)
35.00 (95) 785.61 (113.94) 76.67 (170) 2357.81 (341.96)
* All values rounded to two decimal places.
EVAPORATOR RANGE: From –6.67 to 7.22
C (20 to 45
F), the temperatures represent the gas temperatures inside
the coil and not on the coil surfaces. Add 1.67 to 5.56
C (3 to 10
F) the temperature for coil and air-off temperatures.
CONDENSER RANGE: From 110 to 160
F, temperatures are not ambient. Add 19.4 to 22.2
C (35 to 40
F) for proper
heat transfer, then refer to the pressure chart.
Example: 32
C (90
F) ambient temperature
+22

C (40
F)
54
C (130
F)
Condenser temperature = 1379 kPa (200 psig)
Based on 48.3 km/h (30 mph) air flow.