Model: Honda Accord 2.2L sedan
     Symptom: the engine temperature is often very high, less than 1h on the boil.
     Diagnosis and elimination: poor engine cooling, the first should check the cooling system, open the radiator cover, but the liquid level is slightly lower, make up the antifreeze test, driving 30min engine on the boil.
     And then check the filling of the antifreeze ingredients, but also meet the requirements, check the thermostat, water pump, ignition timing, etc., are normal, and finally found that the engine water temperature is high, the electronic cooling fan can not turn. Check the fan-related ignition main relay, controller, temperature control switch, motor and other components, found that the fan motor control circuit wiring harness has been changed, the fan motor control relay for the normally closed contact, and the original car temperature control switch often Open contact does not match, replace the control relay with the original car, troubleshooting.