iv. Refrigerant injection, as shown in Figure 6-38.
Figure 6-38
1. Expel refrigerant from refrigerating system.
① Switch on air conditioner.
② When engine runs at 1000r/min, make air conditioner compressor work 5~6min, circulate
refrigerant and collect residual oil of all parts to the compressor.
③ Engine misfiring.
④ Expel refrigerant
Note: For refrigerant expelling, press down the one-way valve, and expel slowly to avoid taking
compressor oil out.
2. Inject refrigerant
① Vacuumize with vacuum pump.
② Add in HFC-134a (R134a). Standard: 500g±50g.
3. Engine warming up.
4. Check the leakage of refrigerant. Check the leakage of refrigerant with gas leak detector.
II. Fault diagnosis flow
Poor refrigerating effect, see Figure 6-39
Abnormal ATC see Figure 6-40
Poor heating effect see Figure 6-41
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