Air Conditioning: Overview Toyota Sequoia I рестайлинг

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1. DO NOT HANDLE REFRIGERANT IN AN ENCLOSED AREA OR NEAR AN OPEN FLAME
2. ALWAYS WEAR EYE PROTECTION
3. BE CAREFUL NOT TO GET LIQUID REFRIGERANT IN YOUR EYES OR ON YOUR SKIN If liquid refrigerant gets in your eyes or on your skin. Wash the area with lots of cool water. CAUTION: Do not rub your eyes or skin. Apply clean petroleum jelly to the skin. Go immediately to a physician or hospital for professional treatment.
4. NEVER HEAT CONTAINER OR EXPOSE IT TO OPEN FLAME
5. BE CAREFUL NOT TO DROP CONTAINER OR NOT TO APPLY PHYSICAL SHOCKS TO IT
6. DO NOT OPERATE COMPRESSOR WITHOUT ENOUGH REFRIGERANT IN REFRIGERATION SYSTEM If there is not enough refrigerant in the refrigerant system, oil lubrication will be insufficient and compressor burnout may occur. Necessary care should be taken to avoid this.
7. DO NOT OPEN PRESSURE MANIFOLD VALVE WHILE COMPRESSOR IS OPERATING If the high pressure valve is opened, refrigerant flows in the reverse direction and could cause the charging cylinder to rupture, so open and close only the low pressure valve.
8. BE CAREFUL NOT TO OVERCHARGE SYSTEM WITH REFRIGERANT If refrigerant is overcharged, it causes problems such as insufficient cooling, poor fuel economy, engine overheating, etc.
9. SUPPLEMENTAL RESTRAINT SYSTEM (SRS) The SEQUOIA is equipped with an SRS (Supplemental Restraint System) such as the driver, passenger, side, and curtain shield airbags. Failure to carry out service operation in the correct sequence could cause the SRS to unexpectedly deploy during servicing, possibly leading to a serious accident. Before servicing (including removal or installation of parts, inspection or replacement), be sure to read the precautionary notices in the «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-227602) .

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1. INSPECT REFRIGERANT VOLUME Observe the sight glass on the liquid tube. Test conditions: Running engine at 1,500 RPM Single A/C: Front blower speed control dial at "HI" position Dual A/C: Front and rear blower speed set at "HI" position A/C switch ON Single A/C: Front temperature control dial at "MAX. COOL" position Dual A/C: Front temperature control dial at "MAX. COOL" position Rear temperature control set at 18.5° C (65° F) Fully open the doors
2. INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET This is a method for checking the A/C system by using a manifold gauge set. Read the manifold gauge pressure when the conditions below are met. Test conditions: Temperature at the air inlet with R/F switch set at RECIRC is 30 to 35° C (86 to 95° F) Engine running at 1500 RPM Blower speed control switch at "HI" position Temperature control dial at "MAX. COOL" position Dual A/C: Rear temperature control set at 18.5° C (65° F) HINT: Gauge indications may vary slightly due to ambient temperature conditions. Normally functioning refrigeration system. Gauge reading: Single A/C: NORMALLY FUNCTIONING REFRIGERATION SYSTEM GAUGE READING (SINGLE A/C) Gauge MPa kgf.cm 2 Low pressure 0.15 to 0.25 1.5 to 2.5 High pressure 1.6 to 1.8 16 to 18 Dual A/C: NORMALLY FUNCTIONING REFRIGERATION SYSTEM GAUGE READING (DUAL A/C) Gauge MPa kgf.cm 2 Low pressure 0.25 to 0.35 2.5 to 3.5 High pressure 1.9 to 2.1 19 to 21 Moisture present in refrigeration system. Insufficient cooling Poor circulation of refrigerant Refrigerant does not circulate Refrigerant overcharged or insufficient cooling of condenser Air present in refrigeration system Expansion valve malfunction Insufficient compressor compression
3. INSPECT IDLE-UP SPEED Warm up the engine. Inspect idle-up speed when the following conditions are established. Warm up engine Blower speed control switch at "HI" position A/C switch ON Temperature control dial at "COOL" position MAGNETIC CLUTCH CONDITION Magnetic clutch condition Idle-up speed Magnetic clutch not engaged 700 +/- 50 RPM Magnetic clutch engaged 780 +/- 50 RPM If idle speed is not as specified, check the Idle control system.
4. INSPECT FOR LEAKAGE OF REFRIGERANT Perform under the following conditions: Stop the engine. Secure good ventilation (If not, the gas leak detector may react to volatile gases witch are not refrigerant, such as evaporated gasoline and exhaust gas.) Repeat the test 2 or 3 times. Make sure that there is some refrigerant remaining in the refrigeration system. When the compressor is OFF: approx. 392 to 588 kPa (4 to 6 kgf/cm 2 , 57 to 85 psi) Bring the gas leak detector close to the drain hose before performing the test. HINT: After the blower motor stopped, leave the cooling unit for more than 15 minutes. Bring the gas leak detector sensor under the drain hose. When bringing the gas leak detector close to the drain hose, make sure that the gas leak detector does not react to the volatile gases. If such reaction is unavoidable, the vehicle must be lifted up. If gas leak is not detected on the drain hose, remove the blower motor linear controller from the cooling unit. Then insert the gas leak detector sensor into the unit and perform the test. Disconnect the connector and leave the pressure switch for approx. 20 minutes. Then bring the gas leak detector close to the pressure switch and perform the test. Bring the gas leak detector close to the refrigerant lines and perform the test.

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1. CONNECT QUICK DISCONNECT ADAPTER TO CHARGING HOSES
2. REMOVE CAPS FROM SERVICE VALVES ON REFRIGERANT LINES
3. SET MANIFOLD GAUGE SET Close both valves of the manifold gauge set. Connect the quick disconnect adapters to the service valves.
4. EVACUATE AIR FROM REFRIGERATION SYSTEM Connect the vacuum pump adapter to the vacuum pump. Connect the center hose of the manifold gauge set to the vacuum pump adapter. Open both the high and low side valves and run the vacuum pump. After 10 minutes or more, check that the low pressure gauge indicates 750 mmHg (30 in.Hg) or more. HINT: If the reading is 750 mmHg (30 in.Hg) or more, close both valves of the manifold gauge set and stop the vacuum pump. Check the system for leaks and repair if necessary. Close both the high and low side valves and stop the vacuum pump. Leave the system in this condition for 5 minutes or more and check that there is no change in gauge indication.

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1. INSTALL CHARGING CYLINDER HINT: When handling the charging cylinder, always follow the directions given in the instruction manual. Charge the proper amount of refrigerant into the charging cylinder. Connect the center hose to the charging cylinder. CAUTION: Do not open either the high or low side valve of the manifold gauge set. Open the valve of the charging cylinder. Press the valve core on the side of the manifold gauge and expel the air from the center hose.
2. INSPECT REFRIGERATION SYSTEM FOR LEAKS Open the high pressure side valve and charge refrigerant. When the low pressure gauge indicates 98 kPa (1 kgf/cm 2 , 14 psi), close the high pressure side valve. Using a gas leak detector, check the system for leakage. CAUTION: Use a refrigerant recovery/recycling machine to recover the refrigerant whenever replacing parts.
3. CHARGE REFRIGERANT INTO REFRIGERANT SYSTEM If there is no leak after refrigerant leak check, charge the proper amount of refrigerant into the refrigeration system. CAUTION: Never run the engine when charging the system through the high pressure side. Do not open the tow pressure side valve when the system is being charged with liquid refrigerant. Open the high pressure side valve fully. Charge specified amount of refrigerant, then close the high pressure side valve. HINT: The system is fully charged if bubbles cannot be seen through the sight glass. Partially charge the refrigeration system with refrigerant. Prepare the vehicle: Running engine at 1,500 RPM Single A/C: Front blower speed control dial at "HI" position Dual A/C: Front and rear blower speed set at "HI" position Single A/C: Front temperature control dial at "MAX. COOL" position Dual A/C: Front temperature control dial at "MAX. COOL" position Rear temperature control set at 18.5° C (65° F) Air inlet control set at "RECIRC" Fully open doors (Sliding roof: closed) Open the low pressure side valve. CAUTION: Do not open the high pressure side valve. Charge refrigerant until bubbles disappear and check the pressure on the gauge through the sight glass.

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1. INSPECT DRIVE BELT'S INSTALLATION CONDITION Check that the drive belt fits properly in the ribbed grooves.
2. INSPECT DRIVE BELT TENSION Check that the tension is within the A range on the auto tensioner scale. If the tension is not within the A range on the scale, replace the belt with a new one. HINT: When replacing the drive belt with a new one, the belts tension should be within the B range on the belt tensioner scale.