Initial Inspection
INSPECTIONBefore performing diagnosis, check the following items which might affect A/C system problems.
1. BATTERY
1. Measure the battery voltage and specific gravity of electrolyte.
Standard voltage: 12 V
Specific gravity: Above 1.260
2. Check the condition of the fuses for A/C system power supply and other fuses.
3. Check the condition of the harnesses and harness connectors connection.
2. ASPIRATOR HOSE
1. Turn the ignition switch to ON and push the A/C switch.
2. Turn the temperature control dial to maximum hot position.
3. Turn the air flow control dial to "DEF" position.
4. Turn the fan speed control dial to MAX speed position.
5. Firmly hold a thin paper (b) in front of the in-vehicle sensor suction port (a) for the auto A/C control unit and check that the paper moves towards the port indicating that air is being sucked into the port.
NOTE: Ensure the paper does not get sucked into the port.
6. If the paper does not move at all, remove the auto A/C control unit and check for improper connection of the aspirator hose (A), auto A/ C control unit and heater unit, and secure as necessary.
3. A/C LINE
Check the connection for A/C line (A) and lower side high-pressure pipe.
4. CONTROL LINKAGE
1. Check the state of mode door linkage.
2. Check the state of air mix door linkage.
3. Check the state of intake door linkage.
5. CONTROL SWITCHES
Start and warm-up the engine completely.
1. Inspection using switches
2. Inspection of illumination control