Refrigerant

AIR CONDITIONING: REFRIGERANT: ON-VEHICLE INSPECTION

ON-VEHICLE INSPECTION





1. INSPECT REFRIGERANT VOLUME
(a) Check the sight glass on liquid tube sub-assembly A.
Test conditions:
- Engine running at 1,500 rpm.
- Blower speed control switch at HI.
- A/C switch ON.
- Temperature control lever in MAX. COLD position.
- All doors fully open.





HINT: *: If the ambient temperature is higher than usual but cooling is sufficient, bubbles in the sight glass are permissible.

2. CHECK REFRIGERANT PRESSURE USING MANIFOLD GAUGE SET
(a) This is a method to identify trouble areas by using a manifold gauge set. Read the manifold gauge pressure under the following conditions.
Test conditions:
- Engine warm.
- All doors fully open.
- A/C switch ON.
- Blower speed control switch at HI.
- Engine running at 1,500 rpm.
- Air inlet mode damper set at RECIRC.
- Temperature control lever in MAX. COLD position.
- Air temperature at air inlet 30 to 35°C (86 to 95°F).





(1) When the refrigerant volume is correct, the gauge reading indicates as follows:
Gauge reading:





HINT: Pressure varies in accordance with certain conditions (outside air temperature, sunlight and wind).
(2) When there is moisture in the refrigeration system:









(3) When cooling is insufficient:









(4) When the circulation of the refrigerant is poor:









(5) When the refrigerant does not circulate:









(6) When the refrigerant is overcharged or cooling of condenser is insufficient:









(7) When there is air in the refrigeration system:









(8) When the expansion valve malfunctions:









(9) When the compressor is defective:









3. INSPECT IDLING SPEED
(a) Warm up the engine.
(b) Inspect idling speed when these conditions are established.
Standard:
for 2ZR-FE manual transaxle






for 2ZR-FE automatic transaxle






If the idling speed is not as specified, check the idle control system.