HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS) > Diagnostics with Phenomenon
|
Symptom |
Problem parts |
|
A/C system fails to operate. |
• Fuse (M/B No. 8, F/B No. 22, 31) • Connector (Poor contact) • Ground • Auto A/C control module • Blower fan motor • Blower fan relay • A/C relay • Compressor (Magnet clutch) • Evaporator sensor • Compressor (compressor speed sensor, diesel engine model) |
|
Fuse is blown out. |
• Fuse (M/B No. 8, F/B No. 22, 31) • Connector (Poor contact) |
|
Illumination cannot dim. |
• Fuse (M/B No. 8, F/B No. 22, 31) • Connector (Poor contact) • Auto A/C control module |
|
Blower fan does not rotate or fan speed cannot be controlled. |
• Fuse (M/B No. 8, F/B No. 22, 31) • Connector (Poor contact) • Ground • Auto A/C control module • Blower fan motor • Blower fan relay |
|
Unable to switch suction vents. |
• Connector (Poor contact) • Auto A/C control module • Intake door actuator |
|
Unable to switch vents. |
• Connector (Poor contact) • Auto A/C control module • Mode door actuator |
|
Room temperature does not rise (Warm air does not come out). |
• Connector (Poor contact) • Auto A/C control module • Air mix door actuator • In-vehicle sensor, ambient sensor, evaporator sensor and sunload sensor • In-vehicle sensor aspirator hose • PTC heater (diesel engine model) |
|
Room temperature does not lower (Cold air does not come out). |
• Connector (Poor contact) • Auto A/C control module • Air mix door actuator • A/C relay • Compressor (Magnet clutch) • Radiator fan motor • Radiator fan relay • In-vehicle sensor, ambient sensor, evaporator sensor and sunload sensor • In-vehicle sensor aspirator hose • Compressor (Compressor speed sensor, diesel engine model) |
|
Compartment temperature is higher or lower than setting temperature. |
• Auto A/C control module • Air mix door actuator • In-vehicle sensor, ambient sensor, evaporator sensor and sunload sensor • In-vehicle sensor aspirator hose |
|
Compartment temperature does not quickly respond to setting temperature. |
• Air mix door actuator • In-vehicle sensor, ambient sensor, evaporator sensor and sunload sensor • In-vehicle sensor aspirator hose |
|
Radiator fan does not rotate during A/C operation. |
• Radiator fan motor • Radiator fan relay |