Initial Inspection

ON-VEHICLE INSPECTION







1. INSPECT REFRIGERANT VOLUME
Observe the sight glass on the liquid tube. Test conditions:
- Engine speed at 1,500 rpm
- Blower speed control switch at "HI" position
- A/C switch ON
- Temperature control dial at "COOL" position Doors fully opened

2. INSPECT REFRIGERANT PRESSURE WITH MANIFOLD GAUGE SET
Check the trouble area using a set of manifold gauge set. Read the manifold gauge pressure when following conditions are detected.

Test conditions:
- Temperature at the air inlet with the switch set at RECIRC is 30 - 35 °C (86 - 95 °F)
- Engine speed at 2,000 rpm
- Blower speed control switch at "HI" position
- Temperature control dial on "COOL" position

HINT: It should be noted that the gauge indications may vary depending on ambient temperature conditions.




1. Normally functioning refrigeration system.

Gauge reading:
Low pressure side:
0.15- 0.25 MPa (1.5 - 2.5 kgf/sq.cm)
High pressure side:
1.37-1.57 MPa (14-15 kgf/sq.cm)




2. Moisture present in refrigeration system.




3. Insufficient cooling




4. Poor circulation of refrigerant




5. Refrigerant does not circulate




6. Refrigerant overcharged or insufficient cooling of condenser




7. Air present in refrigeration system




8. Expansion valve improperly




9. Defective compression compressor

3. INSPECT IDLE-UP SPEED

a. Warm up engine




b. Inspect idle-up speed when following conditions are established.

Test conditions:
- Blower speed control switch at "HI" position
- Temperature control dial at "COOL" position
- A/C switch ON
- Put gear shift in neutral

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

4. INSPECT FOR LEAKAGE OF REFRIGERANT

a. Perform in these conditions.
- Stop engine
- Secure good ventilation (The gas leak detector may not 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 compressor is OFF: approx. 392 - 588 kPa(4 - 6 kgf/sq.cm, 57 - 85 psi)

b. Bring the gas leak detector close to the drain hose before performing the test.

HINT:
- After the blower motor stops, leave the cooling for more than 15 minutes.
- Expose the gas leak detector sensor under the drain hose.
- When bring the gas leak detector close to the drain hose, make sure that the gas leak detector does not react to the volatile gases.

If gas leaks are detected, lift up the vehicle.

c. If gas leaks are not detected on the drain hose, remove the blower resistor from the cooling unit. Then insert the gas leak detector sensor into the unit to perform the test.
d. Disconnect the connector and leave the pressure switch for approx. 20 minutes. Then bring the gas leak detector close to the pressure switch to perform the test.
e. Bring the gas leak detector close to the refrigerant lines