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Home >> Ford >> 2004 >> Focus ZX3, 2.0 3, Automatic >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Engine Cooling >> Diagnosis And Testing >> Engine Cooling >> Symptom Chart

Symptom Chart

DIAGNOSTIC REFERENCE

Condition Possible Sources Action
  • Loss of coolant
  • Hoses.
  • Hose connections.
  • Radiator.
  • Coolant pump.
  • Coolant expansion tank.
  • Heater core.
  • Gaskets.
  • Engine casting cracks.
  • Engine block core plugs.
  • The engine overheats
  • Engine coolant loss.
  • Towing weight exceeded.
  • System restriction.
  • Blocked radiator grille.
  • Thermostat.
  • Fuse.
  • Circuit.
  • Fan motor.
  • Coolant pump.
  • Accessory drive belt. Cylinder head temperature (CHT) sensor.
  • Powertrain control module (PCM).
  • The engine does not reach normal operating temperature
  • Thermostat.
  • The cooling fan(s) is inoperative
  • Fuse(s).
  • Circuitry.
  • Cooling fan motor.
  • The cooling fans are on at all times
  • Fuse(s).
  • Circuitry.
  • Low speed fan relay.
  • High speed fan relay.
  • The cooling fans operate in one speed only
  • Fuse(s).
  • Circuitry.
  • Low speed fan relay.
  • High speed fan relay.
  • Cooling fan resistor.
  • The run on fan (ROF) is inoperative
  • Fuse(s).
  • Circuitry.
  • High speed fan relay.
  • ROF thermo-switch.
  • The LH fan operates only in high speed and the RH fan operates only in low speed
  • Circuitry.
  • REPAIR splice S1002 for an open.
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