Heater & Air Conditioner: Overview Toyota Matrix E130

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1. DO NOT HANDLE REFRIGERANT IN AN ENCLOSED AREA OR NEAR AN OPEN FLAME
2. ALWAYS WEAR EYE PROTECTION
3. BE CAREFUL NOT TO GET LIQUID REFRIGERANT IN YOUR EYES OR ON YOUR SKIN If liquid refrigerant gets in your eyes or on your skin. Wash the area with lots of cool water. CAUTION: Do not rub your eyes or skin. Apply clean petroleum jelly to the skin. Go immediately to a physician or hospital for professional treatment.
4. NEVER HEAT CONTAINER OR EXPOSE IT TO NAKED FLAME
5. BE CAREFUL NOT TO DROP CONTAINER AND NOT TO APPLY PHYSICAL SHOCKS TO IT
6. DO NOT OPERATE COMPRESSOR WITHOUT ENOUGH REFRIGERANT IN REFRIGERANT SYSTEM If there is not enough refrigerant in the refrigerant system oil lubrication will be insufficient and compressor burnout may occur, so take care to avoid this, necessary care should be taken.
7. DO NOT OPEN HIGH PRESSURE MANIFOLD VALVE WHILE COMPRESSOR IS OPERATING If the high pressure valves opened, refrigerant flows in the reverse direction and could cause the charging cylinder to rupture, so open and close the only low pressure valve.
8. BE CAREFUL NOT TO OVERCHARGE SYSTEM WITH REFRIGERANT If refrigerant is overcharged, it causes problems such as insufficient cooling, poor fuel economy, engine overheating etc.

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1. INSPECT PRESSURE SWITCH NO. 1. Magnetic clutch control: Inspect pressure switch operation. Set on the manifold gauge set. Connect the positive (+) lead from the ohmmeter to terminal 4 and the negative (-) lead to terminal 1. Check continuity between terminals when refrigerant pressure is changed, as shown in the illustration. If operation is not as specified, replace the pressure switch. Cooling fan control: Inspect pressure switch operation. Connect the positive (+) lead from the ohmmeter to terminal 2 and the negative (-) lead to terminal 3. Check continuity between terminals when refrigerant pressure is changed, as shown in the illustration. If operation is not as specified, replace the pressure switch.
2. COOLER COMPRESSOR ASSY W/MAGNETIC CLUTCH Connect the positive (+) lead from the battery to terminal and the negative (-) lead to the body ground. Check that the magnetic clutch energized. If operation is not as specified, replace the magnet clutch assy.

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1. THERMISTOR, COOLER Check resistance between terminals 1 and 2 of cooler thermistor No. 1 at each temperature, as shown in the chart. Resistance: If resistance value is not as specified, replace the sensor.
2. AIR CONDITIONING CONTROL ASSY Inspect blower switch continuity. TESTER CONNECTION AND SPECIFIED CONDITION (1 OF 2) Condition / Circuit Tester connection Specified condition OFF - No continuity LO 1 - 8 Continuity M1 1 - 6 - 8 Continuity M2 1 - 5 - 8 Continuity HI 1 - 4 - 8 Continuity If continuity is not as specified, replace the air conditioner control assy. Inspect illumination operation. Connect the positive (+) lead from the battery to terminal 2 and negative (-) lead to terminal 3 then check that the illuminations light up. If there is bulb not light up, replace the bulb.
3. COMBINATION SWITCH ASSY Inspect switch continuity. Check the continuity between terminals while switch is pressed, as shown in the chart. TESTER CONNECTION AND SPECIFIED CONDITION (2 OF 2) Tester connection Specified condition 2 - 5 Continuity If continuity is not as specified, replace the cooler switch. Inspect illumination operation. Connect the positive (+) lead from the battery to terminal 4 and negative (-) lead to terminal 3 then check that the illuminations light up. If operation is not as specified, replace the cooler switch. Inspect indicator operation. Connect the positive (+) lead from the battery to terminal 2 and the negative (-) lead to terminal 1. Push the A/C button in and then check that the indicator lights up. If operation is not as specified, replace the cooler switch. Inspect dimming operation Connect the positive (+) lead from the battery to terminal 2 and the negative (-) lead to terminal 1 while press the switch. Connect the positive (+) lead from battery to terminal 4 and then check that the indicator dims. If operation is not as specified, replace the cooler switch.
4. BLOWER RESISTOR Measure resistance between terminals, as shown in the chart below. BLOWER RESISTOR CONNECTOR TERMINALS RESISTANCE Tester connection Specified condition 1 - 2 1.398 - 1.605 ohm 1 - 3 0.465 - 0.535 ohm 1 - 4 3.069 - 3.531 ohm If resistance is not as specified, replace the blower resistor.
5. BLOWER W/FAN MOTOR SUB-ASSY Connect the positive (+) lead from the battery to terminal 2 and negative (-) to terminal 1, then check that the motor operation smoothly. If operation is not as specified, replace the blower motor.
6. HEATER BLOWER MOTOR RELAY ASSY TESTER CONNECTION AND SPECIFIED CONDITION (1 OF 2) Condition tester connection Specified condition constant 1 - 2 Continuity 3 - 4 Apply B+ between terminals 1 and 2. 3 - 5 Continuity If continuity is not as specified, replace the heater blower motor relay.
7. MAGNET-CLUTCH RELAY TESTER CONNECTION AND SPECIFIED CONDITION (2 OF 2) Condition tester connection Specified condition constant 1 - 2 Continuity Apply B+ between terminals 1 and 2. 3 - 5 Continuity If continuity is not as specified, replace the magnet-clutch relay.

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1. INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET This is a method in witch the trouble is located by using a manifold gauge set. Read the manifold gauge pressure when the these conditions are established. Test conditions: Temperature at the air inlet with the switch set at RECIRC is 30 - 35 °C (86 - 95 °F) Engine running at 1500 RPM Blower speed control switch at "HI" position Temperature control dial at "COOL" position A/C switch ON Fully open doors Normally functioning refrigeration system. Gauge reading: Low pressure side: 0.15 - 0.25 MPa (1.5 - 2.5 kgf/cm 2 ) High pressure side: 1.37 - 1.57 MPa (14 - 16 kgf/cm 2 ) Moisture present in refrigeration system. Insufficient cooling Poor circulation of refrigerant Refrigerant does not circulate Refrigerant overcharged or insufficient cooling of condenser Air present in refrigeration system Expansion valve improperly Defective compression compressor

See also:
• FAN AND GENERATOR V BELT (1ZZ-FE)