REFRIGERANT REPLACEMENT
PROCEDURE
RECOVER REFRIGERANT FROM REFRIGERATION SYSTEM
Start the engine.
Turn the A/C switch on.
Operate the cooler compressor while the engine speed is approximately 1000 rpm for 5 to 6 minutes to circulate the refrigerant and collect the compressor oil remaining in each component into the cooler compressor.
Stop the engine.
Recover the refrigerant from the A/C system using a refrigerant recovery unit.
CHARGE REFRIGERANT
09985-20010
09985-02130
09985-02150
09985-02090
09985-02110
09985-02010
09985-02050
09985-02060
09985-02070
Perform vacuum purging using a vacuum pump.
Charge refrigerant HFC-134a (R134a).
Table 1. Standard Cool Box
Refrigerant Charging Amount
w/o Cool Box
810 +/-30 g (28.6 +/-1.1 oz.)
w/ Cool Box
860 +/-30 g (30.3 +/-1.1 oz.)
*a
Amount to be charged
*b
Charge 100 g (3.53 oz.)
*c
Mean valie in proper range
*d
Point where bubbles disappear
*e
Overcharged
*f
High Pressure
*g
Sub-cool System
*h
Refrigerant Amount
Note:Do not operate the cooler compressor before charging refrigerant as the cooler compressor will not work properly without any refrigerant, and will overheat.
Approximately 100 g (3.53 oz.) of refrigerant may need to be charged after bubbles disappear. The refrigerant amount should be checked by measuring its quantity, and not with the sight glass.
WARM UP ENGINE
Warm up the engine at less than 1850 rpm for 2 minutes or more after charging the refrigerant.
Note:Be sure to warm up the compressor by turning the A/C switch is on after removing and installing the cooler refrigerant lines (including the compressor) to prevent damage to the compressor.
CHECK FOR REFRIGERANT GAS LEAK
After recharging the refrigerant gas, check for refrigerant gas leakage using a halogen leak detector.
Perform the operation under these conditions:
Stop the engine.
Secure good ventilation (the halogen leak detector may react to volatile gases other than refrigerant, such as evaporated gasoline or exhaust gas).
Repeat the test 2 or 3 times.
Make sure that some refrigerant remains in the refrigeration system. When the compressor is off: approximately 392 to 588 kPa (4.0 to 6.0 kgf/cm2, 57 to 85 psi).
-
*1
Halogen Leak Detector
*a
Check for Leakage
Using a halogen leak detector, check the refrigerant line for leakage.
If a gas leak is not detected on the drain hose, remove the blower motor control (blower resistor) from the cooling unit. Insert the halogen leak detector sensor into the unit and perform the test.
Disconnect the connector and wait for approximately 20 minutes. Bring the halogen leak detector close to the pressure switch and perform the test.