Automotive Flow Chart

Engine Overheating Diagnostic Flowchart This diagram outlines the step-by-step process for diagnosing and resolving engine overheating issues, from basic coolant checks to advanced diagnostics.

flowchart TD
Start([Start]) --> InitialCheck[Engine overheating?]
InitialCheck -->|No| NoIssue[No issue detected]
NoIssue --> End([End])

    subgraph BasicChecks[Initial Diagnostics]
        CoolantLevel[Coolant level?]
        LeakCheck[Coolant leaks?]
        
        CoolantLevel -->|Low| RefillCoolant[Refill coolant]
        CoolantLevel -->|Normal| LeakCheck
        LeakCheck -->|Yes| RepairLeak[Repair leak]
        LeakCheck -->|No| ComponentChecks
    end
    
    subgraph ComponentChecks[Component Diagnostics]
        FanCheck[Radiator fan working?]
        ThermoCheck[Thermostat OK?]
        PumpCheck[Water pump OK?]
        RadiatorCheck[Radiator clear?]
        
        FanCheck -->|No| FanRepair[Replace fan/wiring]
        FanCheck -->|Yes| ThermoCheck
        ThermoCheck -->|No| ThermoReplace[Replace thermostat]
        ThermoCheck -->|Yes| PumpCheck
        PumpCheck -->|No| PumpReplace[Replace pump]
        PumpCheck -->|Yes| RadiatorCheck
        RadiatorCheck -->|No| RadiatorService[Clean radiator]
        RadiatorCheck -->|Yes| AdvancedChecks
    end
    
    subgraph AdvancedChecks[Advanced Diagnostics]
        HeadGasket[Head gasket OK?]
        DTCCheck[Check DTCs]
        
        HeadGasket -->|No| GasketRepair[Replace gasket]
        HeadGasket -->|Yes| DTCCheck
        DTCCheck -->|P0128| P0128[Replace thermostat]
        DTCCheck -->|P0217| P0217[Check cooling system]
        DTCCheck -->|P0117/8| TempSensor[Replace temp sensor]
        DTCCheck -->|P0268| PumpCircuit[Repair pump circuit]
        DTCCheck -->|No codes| Mechanic[Consult mechanic]
    end
    
    subgraph MonitoringPhase[Temperature Monitoring]
        Monitor[Temperature normal?]
        Monitor -->|Yes| Resolved[Issue fixed]
        Monitor -->|No| Repeat[Repeat diagnosis]
    end
    
    InitialCheck -->|Yes| CoolantLevel
    
    RefillCoolant & RepairLeak --> Monitor
    FanRepair & ThermoReplace & PumpReplace & RadiatorService --> Monitor
    GasketRepair & P0128 & P0217 & TempSensor & PumpCircuit --> Monitor
    
    Mechanic --> End
    Resolved --> End
    Repeat --> InitialCheck