Refrigerant: Service and Repair
REPLACEMENT1. DISCHARGE REFRIGERANT FROM REFRIGERATION SYSTEM
a. Start up the engine.
b. A/C switch is ON.
c. Operate the cooler compressor with an engine speed of approximately 1,000 rpm for 5 to 6 minutes to circulate the refrigerant and collect the compressor oil remaining in each component into the cooler compressor.
d. Stop the engine.
e. Using SST, discharge the refrigerant gas.
SST 07110-58060 (07117-58080, 07117-58090, 07117-78050, 07117-88060, 07117-88070, 07117-88080)
2. CHARGE REFRIGERANT
a. Perform vacuum purging using a vacuum pump.
b. Charge refrigerant HFC-134a (R134a).
Standard: 550 ± 50 g (19.39 ± 1.76 oz.)
SST 07110-58060 (07117-58060, 07117-58070, 07117-58080, 07117-58090, 07117-78050, 07117-88060, 07117-88070, 07117-88080)
NOTE: Do not operate the cooler compressor before charging refrigerant as the cooler compressor will not work properly without any refrigerant, and will overheat.
3. WARM UP ENGINE
a. Warm up the engine at less than 2,000 rpm for 2 minutes or more after charging the refrigerant.
4. CHECK FOR LEAKAGE OF REFRIGERANT
a. After recharging the refrigerant gas, check for refrigerant gas leakage using a halogen leak detector.
b. Perform the operation under these conditions:
- Stop the engine.
- Secure good ventilation (the gas 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 compressor is off: approximately 392 to 588 kPa (4 to 6 kgf.sq.cm, 57 to 85 psi)
c. Bring the gas leak detector close to the drain hose before performing the test.
HINT:
- After the blower motor has stopped, leave the cooling unit for more than 15 minutes.
- Expose 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.
d. If a gas leak is not detected on the drain hose, remove the blower motor control (blower resistor) from the cooling unit. Insert the gas leak detector sensor into the unit and perform the test.
e. Disconnect the connector and leave the pressure switch on for approximately 20 minutes. Bring the gas leak detector close to the pressure switch and perform the test.
f. Bring the gas leak detector close to the refrigerant lines and perform the test.