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HOMESERVICE MANUALSMERCURY2009MILAN PREMIER, 3.0 1, AWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1216 (ENGINE COOLING)DIAGNOSTIC TESTSENGINE COOLINGSYMPTOM CHART
2009 Mercury Milan Premier, 3.0 1, AWD

Symptom Chart

2009 Mercury Milan Premier, 3.0 1, AWDSECTION Symptom Chart
WARNING: This page is about a different car, the 2008 Ford RV Cutaway, 2008 Ford Econoline, 2008 Ford E450 Super Duty, and 2008 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
Symptom Chart

Condition Possible Sources Action
  • Loss of coolant
  • Coolant hoses or tubes
  • Hose clamps
  • Coolant pump O-ring seal or gasket
  • Thermostat O-ring seal or gasket
  • Thermostat housing
  • Radiator
  • Transmission fluid cooler (in radiator) (if equipped) (may leak internally or externally)
  • Degas bottle (if equipped)
  • Coolant expansion tank (if equipped)
  • Pressure relief cap
  • Coolant pump leaking from weep hole
  • Auxiliary coolant pump (if equipped)
  • Heater core
  • Heater control valve (if equipped)
  • Coolant crossover manifold assembly (if equipped)
  • Engine gaskets (may leak internally or externally)
  • Oil cooler (if equipped) (may leak internally or externally)
  • Heated throttle body (TB) or heated TB adapter (if equipped)
  • Heated PCV (if equipped)
  • Fuel pressure regulator coolant bowl (if equipped, natural gas engine)
  • Cylinder block core plugs (if equipped)
  • Cylinder head core plugs (if equipped)
  • Block heater (if equipped)
  • EGR cooler(s) (diesel only)
  • EGR valve (diesel only)
  • The engine overheats
  • Low coolant level
  • External engine coolant leak
  • Air lock in system
  • Pressure relief cap installation
  • Restricted airflow through the charge air cooler (CAC) (diesel only), A/C condenser or radiator
  • Internal engine coolant leak
  • Coolant condition/concentration
  • Accessory drive components
  • Non-OEM engine enhancement components
  • Electric cooling fan (if equipped)
  • Mechanical cooling fan (if equipped)
  • Mechanical cooling fan clutch (if equipped)
  • Radiator
  • Thermostat
  • Engine coolant temperature indicator system (gauge)
  • Engine coolant temperature (ECT) sensor (if equipped)
  • Cylinder head temperature (CHT) sensor (if equipped)
  • Heater core
  • Coolant pump
  • Coolant flow restriction
 
  • Engine oil in engine coolant
  • The engine does not reach normal operating temperature
  • Low coolant level
  • Thermostat
  • Mechanical fan clutch always engaged
  • Electric cooling fan always on
  • Engine coolant temperature indicator system (gauge)
  • ECT sensor (if equipped)
  • CHT sensor (if equipped)
  • The block heater does not operate correctly
  • Block heater power cable
  • CHECK continuity in all 3 power cable circuits. If any circuit measures greater than 5 ohms, INSTALL a new power cable.
 
  • Block heater
  • CHECK the resistance of the block heater. If the resistance does not measure between 12.5 and 17.0 ohms, INSTALL a new block heater.
  • The electric cooling fan(s) or electronically controlled fan clutch is inoperative in one or more speeds or does not operate correctly (if equipped)
  • Wiring
  • Relays
  • Fuses
  • Fan control module
  • Cooling fan motor(s)
  • Cooling fan resistor(s)
  • Electric fan clutch
  • REFER to the appropriate Engine Performance article.
  • The electric cooling fan(s) stay(s) on all the time (if equipped)
  • Wiring
  • Relays
  • REFER to the appropriate Engine Performance article.
  • Noisy electric cooling fan operation (if equipped)
  • Foreign material contamination
  • Fan motor
  • REMOVE the foreign material from the cooling fan and shroud. TEST the system for normal operation. If still noisy, INSTALL a new cooling fan assembly.
 
  • Fan blade detached from fan motor
  • INSTALL a new cooling fan assembly.
  • Noisy mechanical fan operation (if equipped)
  • Fan clutch
  • CARRY OUT the Fan Clutch Test - Minimum Speed Requirement component test.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.