Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Inspection

INSPECTION

PROCEDURE

1. INSPECT WATER INLET WITH THERMOSTAT SUB-ASSEMBLY

(a) Check the valve opening.

HINT:

The valve opening temperature is inscribed on the water inlet with thermostat sub-assembly.

(1) Add 15 cc (0.9 cu. in.) of water to the water inlet with thermostat sub-assembly from the inlet pipe side.

*a Inlet Pipe Side *b Valve Side

(2) Confirm that water does not flow out from the valve side of the water inlet with thermostat sub-assembly.

If water flows out from the valve side of the water inlet with thermostat sub-assembly, replace the water inlet with thermostat sub-assembly with a new one.

(3) Immerse the water inlet with thermostat sub-assembly in water that is between 92°C (198°F) and 96°C (205°F) for 5 minutes or more.

*a	Connector
*b	Inlet Pipe
	Temperature Sensor

(4) Leave the water inlet with thermostat sub-assembly at ambient temperature for 5 minutes so that the valve closes. NOTICE: Make sure that the end of the inlet pipe of the water inlet with thermostat sub-assembly is not facing downward.

*a Inlet Pipe

(5) Check that the water that was added to the water inlet with thermostat sub-assembly has completely flowed out.

If the water that was added to the water inlet with thermostat sub-assembly has not completely flowed out, replace the thermostat sub-assembly with a new one.

(b) Check the resistance of the temperature sensor.

(1) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

If the result is not as specified, replace the water inlet with thermostat sub-assembly.