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 DIAGNOSISENGINE, COOLING AND EXHAUSTCOOLING SYSTEMTESTING AND INSPECTIONCOOLING SYSTEM INSPECTION
2002 Toyota Highlander 4WD L4-2.4L (2AZ-FE)
Cooling System Inspection
2002 Toyota Highlander 4WD L4-2.4L (2AZ-FE)SECTION Cooling System Inspection
ON-VEHICLE INSPECTION
1. INSPECT COOLING SYSTEM FOR LEAKS
CAUTION: To avoid the danger of being burned, do not remove the radiator cap while the engine and radiator are still hot, as fluid and steam can be blown out under pressure.
a. Fill the radiator with coolant and attach a radiator cap tester.
b. Warm up the engine.
c. Pump it to 118 kPa (1.2 kgf/cm2, 17.1 psi), and check that the pressure does not drop. If the pressure drops, check to hoses, radiator or water pump for leaks. If no external leaks are found, check the heater core, cylinder block and head.
2. CHECK ENGINE COOLANT LEVEL AT RESERVOIR
a. The engine coolant level should be between the "LOW" and "FULL" lines, when the engine is cold. If low, check for leaks and add "Toyota Long Life Coolant" or equivalent up to the "FULL" line.
3. CHECK ENGINE COOLANT QUALITY
a. Remove the radiator cap.
CAUTION: To avoid the danger of being burned, do not remove the radiator cap while the engine and radiator are still hot, as fluid and steam can be blown out under pressure.
b. Check if there are any excessive deposits of rust or scale around the radiator cap and radiator filler hole; the coolant should be free from oil.
HINT: If excessively dirty, replace the coolant.
c. Reinstall the radiator cap.
1. INSPECT COOLING SYSTEM FOR LEAKS
CAUTION: To avoid the danger of being burned, do not remove the radiator cap while the engine and radiator are still hot, as fluid and steam can be blown out under pressure.
a. Fill the radiator with coolant and attach a radiator cap tester.
b. Warm up the engine.
c. Pump it to 118 kPa (1.2 kgf/cm2, 17.1 psi), and check that the pressure does not drop. If the pressure drops, check to hoses, radiator or water pump for leaks. If no external leaks are found, check the heater core, cylinder block and head.
2. CHECK ENGINE COOLANT LEVEL AT RESERVOIR
a. The engine coolant level should be between the "LOW" and "FULL" lines, when the engine is cold. If low, check for leaks and add "Toyota Long Life Coolant" or equivalent up to the "FULL" line.
3. CHECK ENGINE COOLANT QUALITY
a. Remove the radiator cap.
CAUTION: To avoid the danger of being burned, do not remove the radiator cap while the engine and radiator are still hot, as fluid and steam can be blown out under pressure.
b. Check if there are any excessive deposits of rust or scale around the radiator cap and radiator filler hole; the coolant should be free from oil.
HINT: If excessively dirty, replace the coolant.
c. Reinstall the radiator cap.
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.