Toyota Corolla (E120) 2002–2008 Repair Manual / Heater & air conditioner / Refrigerant / On–vehicle inspection
Toyota Corolla (E120): On–vehicle inspection
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/cm2) high pressure side:
1.37 – 1.57 Mpa (14 – 16 kgf/cm2)
- Moisture present in refrigeration system.
Symptom |
Probable cause |
Diagnosis |
Remedy |
During operation, pressure on low pressure side sometimes become a vacuum and sometime normal | Moisture in refrigerating system freezes at expansion valve orifice causing a temporary stop of cycle, however, when it melts, normal state is restored. |
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- Insufficient cooling
Symptom |
Probable cause |
Diagnosis |
Corrective actions |
|
Gas leakage in refrigeration system |
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- Poor circulation of refrigerant
Symptom |
Probable cause |
Diagnosis |
Corrective actions |
|
Refrigerant flow obstructed by dirt in receiver | Receiver clogged | Replace condenser |
- Refrigerant does not circulate
Symptom |
Probable cause |
Diagnosis |
Corrective actions |
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|
Refrigerant does not circulate |
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- Refrigerant overcharged or insufficient cooling of condenser
Symptom |
Probable cause |
Diagnosis |
Corrective actions |
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- Air present in refrigeration system
Symptom |
Probable cause |
Diagnosis |
Corrective actions |
|
Air entered in refrigerating system |
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- Expansion valve improperly
Symptom |
Probable cause |
Diagnosis |
Corrective actions |
|
Trouble in expansion valve |
|
Check expansion valve |
- Defective compression compressor
Symptom |
Probable cause |
Diagnosis |
Corrective actions |
|
Internal leak in compressor |
|
Repair or replace compressor |
Gauge readings (reference)
Other materials:
Shifting the shift lever
Vehicles without a smart key system:
While the engine switch is in the “ON” position, depress the brake pedal and
move the shift lever.
Vehicles with a smart key system: While the engine switch is in IGNITION ON mode,
depress the brake pedal and move the shift lever.
When shifting the ...
Rear suspension
Preparation
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Correct driving posture
1 Adjust the angle of the seatback so that you are sitting straight up and so
that you do not have to lean forward to steer.
2 Adjust the seat so that you can depress the pedals fully and so that your arms
bend slightly at the elbow when gripping the steering wheel.
3 Lock the head restraint ...