Basic checks (Mitsubishi Lancer 9)

Note: The procedures for checking the increased engine idle speed, adjusting the tension of the accessory drive belt and replacing the cabin filter are given in the chapter "Maintenance and general check and adjustment procedures".

Checking the refrigerant level through the sight glass

1. Start the engine.

2. Turn on the air conditioner and set the temperature control switch to the "MAX COOL" position.

3. Maintain the engine operating mode at 1500 rpm.

4. Check the amount of refrigerant in the air conditioning system through the sight glass by the number of bubbles.

a) The appearance of foam indicates a very low level of refrigerant (lack of refrigerant).

b) The absence of bubbles indicates an excess of refrigerant.



5. If the amount of refrigerant is not at the optimum level, refill or pump out the refrigerant, and then check the refrigerant level again.

Amount of refrigerant - 550+20 g

Caution: Use the low pressure service valve when performing work.

Note:

• If there is not enough refrigerant in the system, add refrigerant to the system until no bubbles are visible from the sight glass, then add another 100 g of refrigerant.
• If there is excess refrigerant in the system, pump out the refrigerant until bubbles appear in the sight glass, then add another 100 g of refrigerant.

Checking the compressor electromagnetic clutch

1. Disconnect the compressor electromagnetic clutch connector.

2. Connect the wire from the positive terminal of the battery directly to the terminal of the electromagnetic clutch connector.

3. If the clutch is in good condition, you will hear a "click" of it engaging.

4. If the anchor and pulley do not make contact (there is no "click"), then the electromagnetic clutch is faulty.

Checking the refrigerant pressure sensor

1. Install the measuring manifold onto the high pressure service valve.

2. Start the engine and turn on the air conditioner.

3. Check that the sensor signal voltage, depending on the refrigerant pressure between terminal "2" of the sensor and "ground", changes as shown in the graph.

Note: the permissible deviation from the value on the graph is no more than 5%.

Checking the relay

Note: Checking the electric fan control relay is given in the chapter "Cooling system".

1. Checking the heater fan motor relay.

a) Check for a closed circuit between terminals "1" - "3" of the relay when power is not supplied.

b) Apply power (battery voltage) to terminals "1"(+) and "3"(-) and check for a closed circuit between terminals "4" - "5" of the relay.



2. Checking the relay of the electromagnetic clutch of the air conditioner compressor.



a) Check for a closed circuit between terminals "2" - "3" of the relay when power is not supplied.

b) Apply power (battery voltage) to terminals "3"(+) and "2"(-) and check for a closed circuit between terminals 1-4 of the relay.