TROUBLESHOOTING
G-7flowchartFlowchart numbers differ by engine: 5 for K8 / 6 for B6 (condenser fan), 7 for K8 (engine overheat); and by control panel type: 8/10 for logic type, 9/11 for wire type.
FLOW OF TROUBLESHOOTING
Follow the steps below to troubleshoot the heater and air conditioner.
Flow of Troubleshooting
1
START
2
Follow checklist procedure to check system operation. Is system operation normal?
YES
END
NO
3
Determine symptoms of problem based on checklist results.
4
Refer to appropriate flowchart and follow troubleshooting procedure.
5
Repair or replace component(s) as necessary.
return to step 2
CHECKLIST
NOTE
When inspecting the heater or air conditioner, warm up the engine before each operational check. The engine coolant temperature must be 40 °C {104 °F} or higher.
The air conditioner is composed of an electrical system as well as a refrigerant system. Because some refrigerant system components require the evacuation of refrigerant gas before replacement, inspect the electrical system first.
Checklist
Check motor operation when fan switch is turned to 1st, 2nd, 3rd, and 4th respectively.
SymptomBlower motor does not operate at any fan switch position
Flowchart No.1
Check motor operation when fan switch is turned to 1st, 2nd, 3rd, and 4th respectively.
SymptomBlower motor does not operate with fan switch at specific position
Flowchart No.2
Turn on fan switch and A/C switch on; check operation of magnetic clutch and condenser fan.
SymptomMagnetic clutch and condenser fan do not operate
Flowchart No.3
Turn on fan switch and A/C switch on; check operation of magnetic clutch and condenser fan.
SymptomMagnetic clutch does not operate, but condenser fan operates normally
Flowchart No.4
Turn on fan switch and A/C switch on; check operation of magnetic clutch and condenser fan.
SymptomCondenser fan does not operate, but magnetic clutch operates normally
Flowchart No.5 (K8)
Turn on fan switch and A/C switch on; check operation of magnetic clutch and condenser fan.
SymptomCondenser fan does not operate, but magnetic clutch operates normally
Flowchart No.6 (B6)
Turn on fan switch and A/C switch on; check operation of magnetic clutch and condenser fan.
SymptomAirflow is not cool; magnetic clutch and condenser fan operate
Flowchart No.13
Turn on fan switch and A/C switch on; check operation of magnetic clutch and condenser fan.
SymptomEngine overheats at high load; A/C operates normally
Flowchart No.7 (K8)
Move mode switch or lever to each mode and verify that air outlets change accordingly.
SymptomAirflow mode does not change
Flowchart No.8 (logic type)
Move mode switch or lever to each mode and verify that air outlets change accordingly.
SymptomAirflow mode does not change
Flowchart No.9 (wire type)
Move REC/FRESH switch or lever and verify that recirculation and fresh change accordingly
SymptomIntake air mode does not change
Flowchart No.10 (logic type)
Move REC/FRESH switch or lever and verify that recirculation and fresh change accordingly
SymptomIntake air mode does not change
Flowchart No.11 (wire type)
Move temperature control lever from MAX COLD to MAX HOT and verify that airflow temperature changes.
SymptomAirflow temperature does not change
Flowchart No.12
Check refrigerant amount. (Refer to page G-53.)
SymptomAirflow is not cool; magnetic clutch and condenser fan operate
Flowchart No.13