Heating and Air Conditioning: Service and Repair

AIR CONDITIONING: REFRIGERANT: REPLACEMENT

1. RECOVER REFRIGERANT FROM REFRIGERATION SYSTEM

(a) Start up the engine.

(b) Turn the A/C switch on.

(c) Operate the cooler compressor at an engine rpm of approximately 1,000 for 5 to 6 minutes to circulate the refrigerant and collect compressor oil remaining in each component into the cooler compressor as much as possible.

(d) Stop the engine.

(e) Recover the refrigerant from the A/C system using a refrigerant recovery unit.

2. CHARGE REFRIGERANT

(a) Perform vacuum purging using a vacuum pump.

(b) Charge refrigerant HFC-134a (R134a)

Specified amount:

450 to 550 g (15.9 to 19.4oz.)

SST : 09985-20010

09985-02010

09985-02050

09985-02060

09985-02070

09985-02080

09985-02090

09985-02110

09985-02130

09985-02140

09985-02150

NOTICE:
Do not operate the cooler compressor before charging refrigerant as the cooler compressor does not work properly without any refrigerant, which causes the compressor to overheat.

HINT
Prepare a service can to recharge refrigerant if using the refrigerant gas collected with the freon collection / recycling device because the collective rate of the device is approximately 90%.

3. WARM UP ENGINE

(a) Warm up the engine at less than 1,850 rpm for 2 minutes or more after charging refrigerant.

NOTICE:
Be sure to warm up the compressor before turning the A/C switch on after removing and installing the cooler refrigerant lines (including the compressor), to prevent damage to the compressor.

4. INSPECT FOR REFRIGERANT LEAK

(a) After recharging with refrigerant gas, inspect for refrigerant leak gas using a halogen leak detector.

(b) Carry out under the following conditions:

* Stop the engine.

* Secure good ventilation (the gas leak detector may react to volatile gases which 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/cm2, 57 to 85 psi)

(c) Using a gas leak detector, inspect for refrigerant leak from the refrigerant lines.





(d) Bring the gas leak detector close to the drain hose with the detector's power off.





HINT
* After the blower motor has stopped, let the cooling unit stand 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 volatile gases.

If such reaction is unavoidable, the vehicle must be lifted up.

(e) If a gas leak is not detected on the drain hose, remove the blower motor control from the cooling unit. Insert the gas leak detector sensor into the unit and perform the test.

(f) Disconnect the pressure switch connector and leave it for approximately 20 minutes. Bring the gas leak detector close to the pressure switch and perform the test.