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 MANUALSLEXUS2006RX 400H AWD V6-3.3L (3MZ-FE) HYBRIDREPAIR AND DIAGNOSISMAINTENANCEFLUIDSCOOLANTTESTING AND INSPECTION
2006 Lexus RX 400h AWD V6-3.3L (3MZ-FE) Hybrid
Coolant: Testing and Inspection
2006 Lexus RX 400h AWD V6-3.3L (3MZ-FE) HybridSECTION Testing and Inspection
ON-VEHICLE INSPECTION
1. CHECK COOLING SYSTEM FOR LEAKS
CAUTION: Do not remove the radiator cap while the engine and radiator are still hot. Thermal expansion will cause hot engine coolant and steam to blow out from the radiator.
a. Fill the radiator with coolant and attach a radiator cap tester.
b. Warm up the engine.
c. Using a radiator cap tester, increase the pressure inside the radiator to 118 kPa (1.2 kgf-cm, 17 psi), and check that the pressure does not drop.
If the pressure drops, check the hoses, radiator and water pump for leaks. If no external leaks are found, check the heater core, cylinder block and cylinder head.
2. CHECK ENGINE COOLANT LEVEL AT RESERVOIR
a. Check that the engine coolant level is between the LOW and FULL lines when the engine is cold.
If the engine coolant is low, check for leaks and add TOYOTA Super Long Life Coolant or similar high quality ethylene glycol based non-silicate, non amino, non-nitrite and non-borate coolant with long life hybrid organic acid technology to the FULL line.
NOTICE: Do not substitute plain water for engine coolant.
3. CHECK ENGINE COOLANT QUALITY
a. Remove the radiator cap.
CAUTION: Do not remove the radiator cap while the engine and radiator are still hot. Thermal expansion will cause hot engine coolant and steam to blow out from the radiator.
b. Check if there are any excessive deposits of rust or scales around the radiator cap and radiator filler hole. The coolant should be free of oil.
HINT: If excessively dirty, clean the coolant passage and replace the coolant.
c. Install the radiator cap.
1. CHECK COOLING SYSTEM FOR LEAKS
CAUTION: Do not remove the radiator cap while the engine and radiator are still hot. Thermal expansion will cause hot engine coolant and steam to blow out from the radiator.
a. Fill the radiator with coolant and attach a radiator cap tester.
b. Warm up the engine.
c. Using a radiator cap tester, increase the pressure inside the radiator to 118 kPa (1.2 kgf-cm, 17 psi), and check that the pressure does not drop.
If the pressure drops, check the hoses, radiator and water pump for leaks. If no external leaks are found, check the heater core, cylinder block and cylinder head.
2. CHECK ENGINE COOLANT LEVEL AT RESERVOIR
a. Check that the engine coolant level is between the LOW and FULL lines when the engine is cold.
If the engine coolant is low, check for leaks and add TOYOTA Super Long Life Coolant or similar high quality ethylene glycol based non-silicate, non amino, non-nitrite and non-borate coolant with long life hybrid organic acid technology to the FULL line.
NOTICE: Do not substitute plain water for engine coolant.
3. CHECK ENGINE COOLANT QUALITY
a. Remove the radiator cap.
CAUTION: Do not remove the radiator cap while the engine and radiator are still hot. Thermal expansion will cause hot engine coolant and steam to blow out from the radiator.
b. Check if there are any excessive deposits of rust or scales around the radiator cap and radiator filler hole. The coolant should be free of oil.
HINT: If excessively dirty, clean the coolant passage and replace the coolant.
c. Install the radiator cap.
RENDER: 1.0x
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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.