Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2002HIGHLANDER 4WD L4-2.4L (2AZ-FE)REPAIR AND DIAGNOSISHEATING AND AIR CONDITIONINGTESTING AND INSPECTIONINITIAL INSPECTION AND DIAGNOSTIC OVERVIEWINITIAL INSPECTION
2002 Toyota Highlander 4WD L4-2.4L (2AZ-FE)
Initial Inspection
2002 Toyota Highlander 4WD L4-2.4L (2AZ-FE)SECTION Initial Inspection
ON-VEHICLE INSPECTION
1. INSPECT REFRIGERANT VOLUME
a. Observe the sight glass on the liquid tube
Test conditions:
- Running engine at 1,500 rpm
- Blower speed control switch at "HI"
- A/C switch ON
- Temperature control dial at "MAX. COOL"
- Fully open the doors
2. INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET
a. 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 1,500 rpm
- Blower speed control switch at "HI" position
- Temperature control dial at "COOL" position
- A/C switch ON
- Fully open doors
1. Normally functioning refrigeration system.
Gauge reading:
Low pressure side:
0.15 - 0.25 MPa (1.5 - 2.5 kgf/sq.cm)
High pressure side:
1.37 - 1.57 MPa (14 - 16 kgf/sq.cm)
2. Moisture present in refrigeration system.
3. Insufficient cooling
4. Poor circulation of refrigerant
5. Refrigerant does not circulate
6. Refrigerant overcharged or insufficient cooling of condenser
7. Air present in refrigeration system
8. Expansion valve improperly
9. Defective compression compressor
Gauge readings (Reference)
1. INSPECT REFRIGERANT VOLUME
a. Observe the sight glass on the liquid tube
Test conditions:
- Running engine at 1,500 rpm
- Blower speed control switch at "HI"
- A/C switch ON
- Temperature control dial at "MAX. COOL"
- Fully open the doors
2. INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET
a. 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 1,500 rpm
- Blower speed control switch at "HI" position
- Temperature control dial at "COOL" position
- A/C switch ON
- Fully open doors
1. Normally functioning refrigeration system.
Gauge reading:
Low pressure side:
0.15 - 0.25 MPa (1.5 - 2.5 kgf/sq.cm)
High pressure side:
1.37 - 1.57 MPa (14 - 16 kgf/sq.cm)
2. Moisture present in refrigeration system.
3. Insufficient cooling
4. Poor circulation of refrigerant
5. Refrigerant does not circulate
6. Refrigerant overcharged or insufficient cooling of condenser
7. Air present in refrigeration system
8. Expansion valve improperly
9. Defective compression compressor
Gauge readings (Reference)
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.