Refrigerant: Testing and Inspection
AIR CONDITIONING: REFRIGERANT: 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 recirculation.
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:
Low pressure side:
0.15 to 0.25 MPa (1.5 to 2.5 kgf/cm2)
High pressure side:
1.37 to 1.57 MPa (14 to 16 kgf/cm2)
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 the idling speed when these conditions are established.
Engine warm
Transmission shifted to either the neutral or the parking position.
Standard:
for manual transaxle
for automatic transaxle
If the idling speed is not as specified, check the idle control system.