REFRIGERATION SYSTEM
Inspection
1.CHECK BLOWER MOTOR OPERATIONPerformance Chart
TEST CONDITIONTesting must be performed as per the following:
|
Vehicle condition |
Indoors or in the shade (in a well‐ventilated place) |
|
Doors |
Closed |
|
Door windows |
Open |
|
Hood |
Open |
|
Temperature control switch or dial |
Maximum cold |
|
Mode switch |
 (Ventilation) set |
|
Intake switch |
 (Recirculation) set |
 Fan (blower) speed |
Maximum speed set |
|
Engine speed |
Idle speed |
|
Operate the air conditioning system for 10 minutes before taking measurements. |
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TEST READINGRecirculating‐to‐discharge Air Temperature Table
|
Inside air (Recirculating air) at blower assembly inlet |
Discharge air temperature at center ventilator °C (°F) |
|
|
Relative humidity % |
Air temperature °C (°F) |
|
|
50 ‐ 60 |
20 (68) |
6.0 – 8.0 (43 – 46) |
|
25 (77) |
8.4 – 10.9 (47 – 52) |
|
|
30 (86) |
14.5 – 17.5 (58 – 64) |
|
|
60 ‐ 70 |
20 (68) |
7.1 – 9.1 (45 – 48) |
|
25 (77) |
10.9 – 13.4 (52 – 57) |
|
|
30 (86) |
17.5 – 20.5 (64 – 69) |
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Ambient Air Temperature‐to‐operating Pressure Table
|
Ambient air |
High‐pressure (Discharge side) kPa (kg/cm2, psi) |
Low‐pressure (Suction side) kPa (kg/cm2, psi) |
|
|
Relative humidity % |
Air temperature °C (°F) |
||
|
50 ‐ 70 |
25 (77) |
1,204 – 1,471 (12.3 – 15.0, 174.6 – 213.3) |
171 – 209 (1.7 – 2.1, 24.8 – 30.3) |
|
30 (86) |
1,300 – 1,590 (13.3 – 16.2, 188.5 – 230.6) |
196 – 240 (2.0 – 2.4, 28.4 – 34.8) |
|
|
35 (95) |
1,500 – 1,820 (15.3 – 18.6, 217.5 – 263.9) |
229 – 280 (2.3 – 2.9, 33.2 – 40.6) |
|
|
40 (104) |
1,870 – 2,285 (19.1 – 23.3, 271.2 – 331.3) |
292 – 357 (3.0 – 3.6, 42.3 – 51.8) |
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Refrigerant Leakages
Perform a visual inspection of all refrigeration parts, fittings, hoses and components for signs of A/C lubricant leakage, damage and corrosion. A/C lubricant leakage may indicate an area of refrigerant leakage. Allow extra inspection time in these areas when using either an electrical leak detector or fluorescent dye leak detector (SST: J‐42220).
Confirm the leakage with an electrical leak detector if dye is observed. It is possible a prior leakage was repaired and not properly cleaned.
If a leakage is found but continue checking for additional leakages at all system components and connections when searching for leakages.
Move the probe along the suspected leakage area at 1 to 2 inches per second and no further than 1/4 inch from the component when searching for refrigerant leakages using an electrical leak detector.
NOTE：
Moving the electrical leak detector probe slower and closer to the suspected leakage area improves the chances of finding a leakage.