Heating, Air Conditioning & Ventilation: Overview Mitsubishi Outlander III

GENERAL INFORMATION

The blower, heater, and evaporator have been integrated with the heater and A/C system to achieve greater fan power and noise reduction.

GENERAL INFORMATION

INTRODUCTION TO HEATER, A/C AND VENTILATION DIAGNOSIS

Air is drawn into the heater assembly from either the outside, or from the inside of the passenger cabin if DEFROST, maximum cooling or RECIRCULATION are selected. The air is then forced through the evaporator where heat is removed, cooling and de-humidifying the air. Depending on the temperature selected, a portion of this air is then forced through the heater core to achieve the selected discharge temperature.

If the system does not cool properly, look for a problem with the refrigerant, blower or air distribution systems. If the system does not heat properly, look for a problem with the coolant, blower or air distribution systems. In either case all system fuses, circuit breaker and relays should be checked.

TECHNICAL DESCRIPTION (COMMENT)

The wiring harness wire or connectors may have loose, corroded, or damage terminals, or terminals pushed back in the connector, or the A/C control panel may be defective.

The blower system or the compressor system may be defective if there is no cool air coming from the vents.

The A/C control panel power system may be defective if the air conditioning, defogger, and outside/inside air selection damper motor all do not operate normally.

CIRCUIT OPERATION

If the blower motor does not operate, the blower relay system is suspected.

If the blower motor speed cannot be changed, the power transistor circuit is suspected.

If the outside/inside air selection damper control motor does not operate normally, the outside/inside air selection damper control motor system may be defective.

If the air outlet temperature cannot be adjusted, the air mixing damper control motor circuit may be failed.

If the air outlet cannot be switched, the mode selection damper control motor circuit may be failed.

If the voltage is not supplied to the blower motor, the blower relay system may be failed.

If the voltage is not supplied to the A/C control panel, the power supply or ground system to the control panel may be defective.

IDLE-UP OPERATION CHECK

Before inspection and adjustment, set vehicle in the following condition

1. Engine coolant temperature: 80 - 90 °C (176.0 - 194.0 °F)
2. Lights, electric cooling fan and accessories: OFF
3. Transmission: Neutral ("N" or "P" position)
4. Steering wheel: Straightforward

1. Check whether or not the idle speed is the standard value. Refer to «IDLE SPEED CHECK»(ref-593001-S08084066552014011300000) . Standard value: 700 ± 50 r/min
2. Turn on the air conditioning switch and the blower speed selection dial. Engine idling speed should be within the standard value: Standard value: 700 ± 50 r/min NOTE: It is not necessary to make an adjustment, because the idling speed is automatically adjusted by the ISC system. If, however, a deviation from the standard value occurs for some reason, check the ISC system (Refer to «IDLE SPEED CHECK»(ref-593001-S08084066552014011300000) )

Scheme 1

1. Remove the glove box (Refer to «GLOVE BOX»(ref-593027-S32036114152014011300000) ).
2. To replace the clean air filter, loosen the two lugs shown in the illustration.
3. Install the glove box.

Scheme 2

Scheme 3

A/C COMPRESSOR CLUTCH OPERATION CHECK

Connect the compressor connector terminal to the battery positive (+) terminal and ground the battery's negative (-) terminal to the compressor unit. At that time, the A/C compressor clutch should make a definite operating sound.

Scheme 4

Note. The service points which are not described are the same as before.