| Condition | Possible Cause | Action |
|---|---|---|
|
Heater blower won’t work even when its switch is ON
|
Blower fuse blown
|
Replace fuse to check for short.
|
|
Blower resistor faulty
|
Check resistor.
|
|
|
Blower fan switch faulty
|
Check blower fan switch.
|
|
|
Blower motor faulty
|
Replace motor.
|
|
|
Wiring or grounding faulty
|
Repair as necessary.
|
|
|
Incorrect temperature output
|
Control cables broken or binding
|
Check cables.
|
|
Temperature control lever faulty
|
Check control lever.
|
|
|
Control cable clamp position is faulty
|
Check and adjustment.
|
|
|
Air damper broken
|
Repair damper.
|
|
|
Air ducts clogged
|
Repair air ducts.
|
|
|
Heater radiator leaking or clogged
|
Replace radiator.
|
|
|
Heater hoses leaking or clogged
|
Replace heater hoses.
|
|
|
When mode control lever is changed, air outlet port is not changed
|
Control cable broken or binding
|
Check cable.
|
|
Mode control lever faulty
|
Check control lever.
|
|
|
Control cable clamp position is faulty
|
Check and adjustment.
|
|
|
Air damper broken
|
Repair damper.
|
|
|
Air ducts leaking or clogged
|
Repair air ducts.
|
| Condition | Possible Cause | Action |
|---|---|---|
|
Heater blower motor dose not work even when its switch is ON
|
Fuse blown
|
Replace fuse to check for short.
|
|
Heater blower resistor faulty
|
Check heater blower resistor.
|
|
|
Heater blower fan switch faulty
|
Check heater blower fan switch.
|
|
|
Heater blower motor faulty
|
Replace heater blower motor.
|
|
|
Wiring or grounding faulty
|
Repair as necessary.
|
|
|
Incorrect temperature output
|
Control cables broken or binding
|
Check control cables.
|
|
Temperature control lever faulty
|
Check temperature control lever.
|
|
|
Control cable clamp position is faulty
|
Check and adjust.
|
|
|
Air damper broken
|
Repair air damper.
|
|
|
Air ducts clogged
|
Repair air ducts.
|
|
|
Heater core leaking or clogged
|
Replace heater core.
|
|
|
Heater hoses leaking or clogged
|
Replace heater hoses.
|
|
|
When mode control lever is changed, air outlet port is not changed
|
Control cable broken or binding
|
Check control cable.
|
|
Mode control lever faulty
|
Check mode control lever.
|
|
|
Control cable clamp position is faulty
|
Check and adjust.
|
|
|
Air damper broken
|
Repair air damper.
|
|
|
Air ducts leaking or clogged
|
Repair air ducts.
|
| Condition | Possible Cause | Action |
|---|---|---|
|
Heating performance is poor
|
Wiring or grounding for additional heater assembly faulty
|
Repair as necessary.
|
|
Additional heater fuses blown
|
Replace additional heater fuses to check for short.
|
|
|
Additional heater relays faulty
|
Check additional heater relays.
|
|
|
Additional heater assembly faulty
|
Check additional heater assembly.
|
|
|
ECM faulty
|
Check ECM.
|