Lexus NX: Precaution
PRECAUTION
PRECAUTIONS FOR REFRIGERANT HFO-1234yf (R1234yf)
(a) Compatibility
(1) The parts used in the refrigerant cycle, etc. of the HFO-1234yf (R1234yf) system are not compatible with the conventional HFC-134a (R134a) system.
(b) HFO-1234yf (R1234yf) Refrigerant
(1) Always use HFO-1234yf (R1234yf) as the refrigerant.
CAUTION:
- Do not charge the system with refrigerant near open flame, as HFO-1234yf (R1234yf) is combustible.
- When charging the system with refrigerant, make sure that the area is well ventilated (especially be careful in areas where the gas can easily accumulate, such as under lifts and in garage pits, as the gas is heavier than air).
- Follow any local regulations regarding combustible gases.
- Be sure to use a refrigerant recovery unit that is compatible with HFO-1234yf (R1234yf) systems.
- High pressure gas is used for the air conditioning system. Be sure to follow the procedure described in the repair manual.
HINT:
The shape of the service port for refrigerant charging has an exclusive design conforming to international standards for HFO-1234yf (R1234yf) to prevent improper refrigerant charging.
(c) Compressor Oil
(1) Always use ND-OIL 11 as the compressor oil.
(2) When parts of the air conditioning system are removed, quickly block off any areas that are exposed to the outside air with plugs, vinyl tape, etc., as the oil used for HFO-1234yf (R1234yf) systems absorbs moisture easily.
(3) Do not allow the compressor oil to spray, as the oil used for HFO-1234yf (R1234yf) systems has harmful effects on acrylic resins.
(d) Evacuation
(1) When evacuating the system, be sure to use a refrigerant recovery unit, refrigerant recycler and refrigerant charger that are compatible with HFO-1234yf (R1234yf) systems.
(e) Refrigerant Gas Leak Inspection
(1) Use a halogen leak detector to check for refrigerant gas leaks.
HINT:
Be sure to use a halogen leak detector that is compatible with HFO-1234yf (R1234yf) systems.
(2) Turn the engine switch off when checking for refrigerant leaks.
HINT:
- If the engine is running when checking for leaks, the leaking gas will be diluted by the air from the fan and blower, making detection more difficult.
- If the air conditioning system is operating when checking for leaks, the refrigerant pressure in the system will decrease, making it harder for gas to leak.
- If the air conditioning system is operating when checking for leaks, the electronic gas leak detector may react to a sudden change in humidity due to the humid air coming from the drain cooler hose and a faulty judgment may be made.
PRECAUTIONS RELATED TO REMOVAL AND INSTALLATION OF PARTS
(a) In case refrigerant gets in your eyes
(1) Do not rub your eyes with your hands or a cloth.
(2) Consult an eye doctor.
(b) Handling of Refrigerant (Container)
(1) Do not heat the container. If the container is directly heated or put into boiling water, the pressure inside the container will become abnormally high and the container may burst.
(2) Do not drop or strike the container.
(3) Do not bring the container anywhere near your face. Always wear eye protection.
(c) Pipe Installation
(1) Always use new O-rings.
HINT:
When removing an O-ring, use an object with a soft tip so as not to damage the piping.
(2) Apply a sufficient amount of compressor oil (ND-OIL 11) to the O-ring.
(3) Route the hoses in the way they are naturally shaped. Do not twist or forcibly bend the hoses.
(4) Do not use cloth gloves, etc. as fibers attached to O-rings can lead to refrigerant gas leaks.
READ NEXT:
Replacement
REPLACEMENT PROCEDURE 1. RECOVER REFRIGERANT FROM REFRIGERATION SYSTEM (a) Turn the power switch on (READY). (b) Operate the cooler compressor under the conditions shown below: Item Condition
Refrigerant Line
ComponentsCOMPONENTS ILLUSTRATION *1 LIQUID TUBE SUB-ASSEMBLY *2 DISCHARGE HOSE SUB-ASSEMBLY *3 SUCTION HOSE SUB-ASSEMBLY *4 AIR CONDITIONER TUBE AND ACCESSORY ASSEMBLY *5 P
Relay
On-vehicle InspectionON-VEHICLE INSPECTION PROCEDURE 1. INSPECT PTC HEATER RELAY(PTC HTR NO. 1, NO. 3) (a) Measure the resistance according to the value(s) in the table below. Standard Resistance:
SEE MORE:
Parts Location
PARTS LOCATION ILLUSTRATION *1 NO. 2 ENGINE ROOM RELAY BLOCK - ODS FUSE *2 FRONT SEAT INNER BELT ASSEMBLY RH *3 AIR CONDITIONING CONTROL ASSEMBLY *4 OCCUPANT DETECTION ECU *5 COMBINATION METER ASSEMBLY *6 AIRBAG ECU ASSEMBLY *7 FRONT OCCUPANT CLASSIFICATION SENSOR
Terminals Of Ecu
TERMINALS OF ECU MOBILE WIRELESS CHARGER CRADLE ASSEMBLY Terminal No. (Symbol) Wiring Color Terminal Description Condition Specified Condition
*1: When the power switch is turned from off to on (ACC), the mobile wireless charger cradle assembly checks the charging stop signal for 1 s
