Engine Cooling System Ford Explorer Sport Trac II

Material

Material

GENERAL SPECIFICATIONS

GENERAL SPECIFICATIONS

TORQUE SPECIFICATIONS

TORQUE SPECIFICATIONS

Note. If Cooling System Stop Leak Pellets are used, darkening of the Motorcraft Premium Gold Coolant from yellow to golden tan will occur.

The engine cooling system consists of the

1. block heater.
2. fan blade and clutch.
3. fan shroud.
4. coolant expansion tank.
5. thermostat.
6. thermostat housing assembly (4.0L SOHC).
7. coolant pump.
8. radiator.
9. radiator cap.
10. radiator hose.
11. heater tube assembly (4.0L SOHC).

The radiator allows excess engine heat to be transferred to the air.

The coolant pump forces coolant to flow through the cooling system.

The thermostat is a control valve actuated by coolant temperature. When the thermostat is closed, coolant flow bypasses the radiator circuit and returns to the coolant pump. When the thermostat is opened, coolant is allowed to flow through the radiator circuit in order to transfer engine generated heat to the outside air.

The radiator cap serves as the location for filling the cooling system and provides for a controlled pressure in the cooling system. When the pressure reaches a predetermined level, a valve in the radiator cap opens to allow coolant to flow into the coolant expansion tank. As the engine cools, a valve in the radiator cap allows for coolant to flow from the coolant expansion tank back into the radiator.

The coolant expansion tank holds surplus coolant, allows for coolant expansion and replenishes coolant to the cooling system. It is equipped with a non-pressurized cap which allows coolant to be added to keep it filled to prescribed levels.

The electronically controlled fan clutch is controlled by the PCM based upon requests for airflow to cool the engine, transmission and A/C condenser. If no cooling is required, the electronics permit the fan to spin at a slower speed yielding improved fuel economy.

The optional block heater keeps the engine coolant warm during cold weather. The electrical heating element is installed in a core plug opening and uses a standard 110V electrical supply.

Engine coolant provides freeze protection, boil protection, cooling efficiency and corrosion protection to the engine and cooling components. In order to obtain these protections, the engine coolant must be maintained at the correct concentration and fluid level in the coolant expansion tank.

When adding engine coolant, use a 50/50 mixture of engine coolant and distilled water.

To maintain the integrity of the coolant and the cooling system

1. add Motorcraft Premium Gold Engine Coolant. Do not mix coolant types.
2. do not add orange-colored Motorcraft Specialty Orange Engine Coolant. Mixing coolants may degrade the coolant's protection rating.
3. do not add alcohol or methanol or any engine coolants mixed with alcohol or methanol antifreeze. These can cause engine damage from overheating or freezing.
4. do not mix with recycled coolant. Use of such a coolant may harm the engine and cooling system components.
5. the addition of Cooling System Stop Leak Pellets darkens Motorcraft Premium Gold Engine Coolant from yellow to golden tan.

Note. Black arrows indicate hot, white arrows indicate cold.

Scheme 1

Note. Black arrows indicate hot, white arrows indicate cold.

Scheme 2

Note. Black arrows indicate hot, white arrows indicate cold.

Scheme 3

Note. Black arrows indicate hot, white arrows indicate cold.

Scheme 4

Note. Black arrows indicate hot, white arrows indicate cold.

Scheme 5

Note. Black arrows indicate hot, white arrows indicate cold.

Scheme 6

Special Tools Illustration Tool Name Tool Number 73III Automotive Meter 105-R0057 or equivalent Battery/Antifreeze Tester 014-R1060 or equivalent Pressure Test Kit 014-R1072 or equivalent Vehicle Communication Module (VCM) and Integrated Diagnostic System (IDS) software with appropriate hardware or equivalent scan tool

Scheme 7

Scheme 8

Material

Principles of Operation

Engine coolant flows primarily from the engine to the radiator circuit and back to the coolant pump. From the coolant pump, coolant is sent through the engine block and cylinder heads. A separate circuit from the engine also feeds the heater core with coolant. On most engines, the coolant pump is operated by engine rotation through a pulley which is driven by the accessory drive belt to circulate the coolant. Some engines use a belt driven by a pulley attached to the camshaft and some engines use a sprocket driven by the timing chain to operate the coolant pump. The coolant thermostat is a control valve actuated by coolant temperature. When the thermostat is closed, coolant flow bypasses the radiator circuit and returns to the coolant pump. When the thermostat is opened, coolant is allowed to flow through the radiator circuit in order to transfer engine generated heat to the outside air.

Note. The vehicle is equipped with either a degas bottle or an expansion tank.

The degas bottle, if equipped, holds surplus coolant and removes air from the cooling system, which reduces hot spots. It also allows for coolant expansion and system pressurization, replenishes coolant to the cooling system and serves as the location for service fill.

The coolant expansion tank, if equipped, holds surplus coolant, allows for coolant expansion and replenishes coolant to the cooling system. It is equipped with a non-pressurized cap which allows coolant to be added to the tank to keep it filled to prescribed levels.

The cooling fan draws air through the radiator to help cool the system coolant as it passes through the radiator.

The thermostat monitor is a function of the PCM and is designed to verify correct thermostat operation. The monitor will be executed once per drive cycle and has a monitor run duration of 300-800 seconds. If a malfunction occurs, DTC P0125 or P0128 is set, and the malfunction indicator lamp (MIL) will be illuminated.

For vehicle/engine specific information, refer to Engine Cooling in the Description and Operation portion of this article.

Inspection and Verification

Note. The engine cooling system is filled with Motorcraft Premium Gold Engine Coolant. Mixing coolant types degrades the corrosion protection of Motorcraft Premium Gold Engine Coolant. Do not mix coolant types. Failure to follow these instructions may result in engine or cooling system damage.

Note. Vehicles equipped with a degas bottle system have the pressure relief cap on the degas bottle and no radiator cap. Vehicles equipped with a coolant expansion tank system have the pressure relief cap on the radiator.

1. Verify the customer concern.
2. Visually check the engine coolant level at the degas bottle or coolant expansion tank when the system is cold.
3. Make sure the pressure relief cap is installed correctly.
4. Record any cooling system DTCs retrieved. Refer to the «PCM DTC TABLE»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system) in this article for DTC descriptions.
5. If the system coolant is filled correctly and no DTCs associated with fail-safe cooling are retrieved, verify the customer's concern by operating the engine to duplicate the condition.
6. Inspect to determine if any of the following mechanical or electrical concerns apply. VISUAL INSPECTION CHART Mechanical Electrical Leaks or weeps at: Hoses Tubes Clamp joints Quick connect couplings (if equipped) Gaskets O-rings Thermostat housing Radiator Pressure relief cap Coolant pump Heater core (wet floor or coolant odor in vehicle) Heater control valve Heated throttle body (TB) or heated TB adapter (if equipped) Coolant crossover manifold assembly (if equipped) Oil cooler (if equipped) Degas bottle (if equipped) Coolant expansion tank (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) Inoperative or damaged: Electric cooling fan (if equipped) Electronically actuated fan clutch Electronically actuated fan clutch controller Wiring, connectors, relays or modules Engine coolant temperature (ECT) sensor (if equipped) Cylinder head temperature (CHT) sensor (if equipped) Intake air temperature (IAT) sensor (if equipped) Mass air flow (MAF) sensor Vehicle speed sensor (VSS) VISUAL INSPECTION CHART Mechanical Electrical Cracked or damaged: Hoses Tubes Hose clamps Heater control valve (if equipped) Thermostat housing Radiator Pressure relief cap Cooling fan Fan clutch (if equipped) Coolant pump Degas bottle (if equipped) Coolant expansion tank (if equipped) Oil cooler (if equipped) Coolant crossover manifold assembly (if equipped) Cylinder block core plugs (if equipped) Cylinder head core plugs (if equipped) Block heater (if equipped) Restricted airflow through the A/C condenser/radiator Drive belt loose, worn or installed incorrectly Broken or weak drive belt tensioner Excessive white or light gray exhaust smoke (may have burnt coolant odor) Coolant in engine oil Engine oil in coolant Coolant in automatic transmission fluid (if equipped) Automatic transmission fluid (if equipped) in coolant
7. If the inspection reveals an obvious concern that can be readily identified, repair it as necessary. Test the system for normal operation.
8. Inspect the coolant condition in the following sequence: Inspect the coolant color. If Motorcraft Premium Gold Engine Coolant has a clear or pale yellow color, this indicates higher water content than required. Test the engine coolant freezing point range with the Battery/Antifreeze Tester. The freezing point should be in the range -45°C to -23°C (-50°F to -10°F). If the vehicle is driven in cold climates less than -36°C (-34°F), it may be necessary to increase the coolant concentration to get adequate freeze protection. Recommended coolant concentration is 50/50 ethylene glycol to distilled water. A pale green color indicates incorrect coolant (green in color) may have been added to the system. Use of incorrect (green in color) coolant degrades the corrosion protection of Motorcraft Premium Gold Engine Coolant. Flush the system and refill with the correct mixture of distilled water and Motorcraft Premium Gold Engine Coolant. NOTE: If Cooling System Stop Leak Pellets are used, darkening of the Motorcraft Premium Gold Engine Coolant from yellow to golden tan will occur. Dark brown could indicate a commercially available stop leak may have been used. Flush the system and refill with the correct mixture of distilled water and Motorcraft Premium Gold Engine Coolant. A light or reddish brown color indicates that rust may be present in the cooling system. Flush the system and refill with the correct mixture of distilled water and Motorcraft Premium Gold Engine Coolant. An iridescent sheen on top of the coolant could indicate a trace of oil is entering the system. For information on engine diagnosis, refer to «ENGINE SYSTEM - GENERAL INFORMATION»(/ford/explorer-sport-trac/ii-2006-2010/remont/mechanical/#engine-system-general-information) article. A milky brown color may indicate that engine oil is entering the cooling system. Pressure test the cooling system. Refer to «Component Tests»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system) . If engine oil is suspected, the cause of the leak may be internal to the engine. Refer to «ENGINE SYSTEM - GENERAL INFORMATION»(/ford/explorer-sport-trac/ii-2006-2010/remont/mechanical/#engine-system-general-information) article. A red, orange or light green colored sheen on top of the coolant may indicate that transmission fluid is entering the cooling system. The cause may be a leaky radiator. Pressure test the cooling system. Refer to the «Component Tests»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system) . If the engine coolant appearance is acceptable, test the engine coolant freezing point range with the Battery/Antifreeze Tester. The freezing point should be in the range -45°C to -23°C (-50°F to -10°F). If the vehicle is driven in cold climates less than -36°C (-34°F), it may be necessary to increase the coolant concentration to get adequate freeze protection. Recommended coolant concentration is 50/50 ethylene glycol to distilled water. Maximum coolant concentration is 60/40 for cold weather areas. Minimum coolant concentration is 40/60 for warm weather areas. Adjust coolant range and level if necessary: If coolant is low, add specified coolant mixture only. If the engine coolant tests too weak, remove some of the engine coolant and add undiluted engine coolant until the readings are within acceptable levels. If the engine coolant tests strong, remove some of the engine coolant and add distilled water until the readings are within acceptable levels.
9. If an obvious cause for an observed or reported concern is found, correct the cause and test the system for normal operation before proceeding to the next step.
10. If the cause is not visually evident, connect the scan tool to the data link connector (DLC).
11. If the scan tool does not communicate with the VCM: check the VCM connection to the vehicle. check the scan tool connection to the VCM. refer to «MODULE COMMUNICATIONS NETWORK»(/ford/explorer-sport-trac/ii-2006-2010/remont/communication-devices/#module-communications-network) article, No Power To The Scan Tool, to diagnose no communication with the scan tool.
12. If the scan tool does not communicate with the vehicle: verify the ignition key is in the ON position. verify the scan tool operation with a known good vehicle. refer to «MODULE COMMUNICATIONS NETWORK»(/ford/explorer-sport-trac/ii-2006-2010/remont/communication-devices/#module-communications-network) article to diagnose no response from the PCM.
13. Carry out the network test. If the scan tool responds with no communication for one or more modules, refer to «MODULE COMMUNICATIONS NETWORK»(/ford/explorer-sport-trac/ii-2006-2010/remont/communication-devices/#module-communications-network) article. If the network test passes, retrieve and record continuous memory DTCs.
14. Clear the continuous DTCs and carry out the self-test diagnostics PCM.
15. If the DTCs recovered are related to the concern, go to the PCM DTC table. For all other DTCs, refer to «MULTIFUNCTION ELECTRONIC MODULES»(/ford/explorer-sport-trac/ii-2006-2010/remont/communication-devices/#multifunction-electronic-modules) article.
16. If no DTCs related to the concern are retrieved, go to «Symptom Chart»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system) .

PCM DTC TABLE

Symptom Chart

Symptom Chart

Normal Operation

The engine cooling system is a closed system that provides for coolant expansion and contraction and also changes in pressure as coolant warms and cools with engine operation. Various gaskets, seals, hoses and clamps are used to contain coolant within the cooling system and keep other fluids and contaminants from entering the cooling system.

Coolant loss can be attributed to either external or internal leaks anywhere within the cooling system.

For vehicle/engine specific information, refer to Engine Cooling in the Description and Operation portion of this article.

This pinpoint test is intended to diagnose the following

1. Coolant hoses or tubes
2. Hose clamps
3. Thermostat O-ring seal or gasket
4. Coolant pump O-ring seal or gasket
5. Thermostat housing
6. Heater control valve (if equipped)
7. Radiator
8. Transmission fluid cooler (in radiator) (if equipped)
9. Pressure relief cap
10. Coolant pump leaking from weep hole
11. Auxiliary coolant pump (if equipped)
12. Heater core
13. Heated throttle body (TB) or heated TB adapter (if equipped)
14. Coolant crossover manifold assembly (if equipped)
15. Engine gaskets
16. Oil cooler (if equipped)
17. Degas bottle (if equipped)
18. Coolant expansion tank (if equipped)
19. Heated PCV (if equipped)
20. Fuel pressure regulator coolant bowl (if equipped, natural gas engine)
21. Cylinder block core plugs (if equipped)
22. Cylinder head core plugs (if equipped)
23. Block heater (if equipped)
24. Engine coolant temperature (ECT) sensor (if equipped)

PINPOINT TEST A: LOSS OF COOLANT

1. A1 CARRY OUT INSPECTION AND VERIFICATION Carry out the Inspection and Verification procedure in this article. Were any concerns found? YES : REPAIR as needed. TEST the system for normal operation. NO : Go to A2 .
2. A2 CHECK THE ENGINE COOLANT LEVEL NOTE: Allow the engine to cool before checking the engine coolant level. Key in OFF position. Visually inspect the engine coolant level at the degas bottle or the coolant expansion tank. Is the engine coolant level within specifications? YES : Go to A3 . NO : ADJUST the engine coolant level as necessary. Go to A3 .
3. A3 PRESSURE TEST THE ENGINE COOLING SYSTEM Pressure test the engine cooling system. Refer to «Component Tests»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system) , Cooling System Pressure Test in this article. Does the engine cooling system leak? YES : REPAIR or INSTALL new components. TEST the system for normal operation. NO : If the vehicle is equipped with a coolant expansion tank, go to A4 . If the vehicle is equipped with a degas bottle, go to A5 .
4. A4 CHECK THE PRESSURE RELIEF CAP Carry out the pressure relief cap pressure test. Refer to «Component Tests»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system) , Pressure Relief Cap Pressure Test in this article. Is the pressure relief cap OK? YES : Go to A5 . NO : INSTALL a new pressure relief cap. TEST the system for normal operation.
5. A5 CHECK THE ENGINE COOLANT FOR AN INTERNAL LEAK Inspect the engine coolant in the degas bottle or coolant expansion tank for signs of engine oil or transmission fluid. Is engine oil or transmission fluid evident in the coolant? YES : If engine oil is evident, go to «ENGINE SYSTEM - GENERAL INFORMATION»(/ford/explorer-sport-trac/ii-2006-2010/remont/mechanical/#engine-system-general-information) article for engine diagnosis. If transmission fluid is evident, INSTALL a new radiator. REPAIR the transmission as necessary. Refer to the appropriate Automatic Transmission article for the procedure. TEST the system for normal operation. NO : Go to A6 .
6. A6 CHECK THE ENGINE OIL AND TRANSMISSION FLUID FOR COOLANT Remove the oil level indicators from the engine and the transmission. Is coolant evident in the oil or transmission fluid? YES : If coolant is in the engine oil, go to «ENGINE SYSTEM - GENERAL INFORMATION»(/ford/explorer-sport-trac/ii-2006-2010/remont/mechanical/#engine-system-general-information) article. If coolant is in the transmission fluid, INSTALL a new radiator. REPAIR the transmission as necessary. Refer to the appropriate Automatic Transmission article for the procedure. NO : Go to A7 .
7. A7 CHECK THE COOLING SYSTEM FOR COMBUSTION GASES NOTE: Use U-View® Combustion Leak Tester part number 560000 or equivalent. Using a cooling system combustion gas leak tester, following the instructions supplied with the tester, check the coolant for combustion gases. Are combustion gases present? YES : Go to «ENGINE SYSTEM - GENERAL INFORMATION»(/ford/explorer-sport-trac/ii-2006-2010/remont/mechanical/#engine-system-general-information) article for engine diagnosis. NO : The cooling system is operational.

The engine cooling system functions to maintain engine temperatures during operation. Correct coolant flow through the engine, radiator and remainder of cooling system passages and components is essential to maintaining a correct engine temperature.

Engine coolant flows primarily from the engine to the radiator circuit and back to the coolant pump. From the coolant pump, coolant is sent through the engine block and cylinder heads. A separate circuit from the engine also feeds the heater core with coolant. On most engines, the coolant pump is operated by engine rotation through a pulley which is driven by the accessory drive belt to circulate the coolant. Some engines use a belt driven by a pulley attached to the camshaft, and some engines use a sprocket driven by the timing chain to operate the coolant pump. The coolant thermostat is a control valve actuated by coolant temperature. When the thermostat is closed, coolant flow bypasses the radiator circuit and returns to the coolant pump. When the thermostat is opened, coolant is allowed to flow through the radiator circuit in order to transfer engine generated heat to the outside air.

Engine overheating generally occurs when there is a disruption in the ability to control either coolant flow at the correct rate, the inability to transfer heat from the engine through the coolant (including low coolant) or an inability to transfer engine generated heat to the outside air through the radiator.

For vehicle/engine specific information, refer to Engine Cooling in the Description and Operation portion of this article.

1. DTC P0217 Engine Coolant Overtemperature Condition
2. DTC P1285 Cylinder Head Overtemperature Condition
3. DTC P1299 Cylinder Head Overtemperature Protection Active

This pinpoint test is intended to diagnose the following

1. Low coolant level
2. External engine coolant leak
3. Airlock in system
4. Pressure relief cap installation
5. Restricted airflow through the A/C condenser/radiator
6. Internal engine coolant leak
7. Coolant condition/concentration
8. Accessory drive components
9. Non-OEM engine enhancement components
10. Electric cooling fan (if equipped)
11. Mechanical cooling fan blade (if equipped)
12. Mechanical cooling fan clutch (if equipped)
13. Engine coolant temperature (ECT) indicator system (gauge)
14. ECT sensor (if equipped)
15. Cylinder head temperature (CHT) sensor (if equipped)
16. Heater core
17. Coolant pump
18. Coolant flow restriction

PINPOINT TEST B: THE ENGINE OVERHEATS

1. B1 CARRY OUT INSPECTION AND VERIFICATION Carry out the Inspection and Verification procedure in this article. Were any concerns found? YES : REPAIR as needed. TEST the system for normal operation. NO : Go to B2 .
2. B2 CHECK FOR DTCs NOTE: Refer to the «Introduction - Gasoline Engines»(/ford/explorer-sport-trac/ii-2006-2010/remont/testing-diagnostics/#engine-controls-introduction-except-diesel-hybrid) article for correct scan tool hook-up procedure. Check for DTC P0217, P1285 or P1299. Is DTC P0217, P1285 or P1299 present? YES : Go to B3 . NO : Actual engine overheating has not been verified. CHECK the ECT gauge operation. REFER to «INSTRUMENT CLUSTER (IC), MESSAGE CENTER, AND WARNING CHIMES»(/ford/explorer-sport-trac/ii-2006-2010/remont/gauges-instrument-panels/#information-center) article. If any other DTCs are retrieved, REFER to the «Introduction - Gasoline Engines»(/ford/explorer-sport-trac/ii-2006-2010/remont/testing-diagnostics/#engine-controls-introduction-except-diesel-hybrid) article.
3. B3 CHECK FOR AN AIRFLOW OBSTRUCTION Check the radiator or A/C condenser for an external obstruction such as leaves or cardboard. Is an obstruction present? YES : REMOVE the obstruction. TEST the system for normal operation. NO : Go to B4 .
4. B4 CHECK THE ENGINE COOLANT LEVEL NOTE: Allow the engine to cool before checking the coolant level. Key in OFF position. Visually check the engine coolant level in the degas bottle or coolant expansion tank. Is the engine coolant level within specification? YES : Go to B5 . NO : ADJUST the engine coolant level as necessary. Go to B5 .
5. B5 PRESSURE TEST THE ENGINE COOLING SYSTEM Pressure test the engine cooling system. Refer to «Component Tests»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system) , Cooling System Pressure Test in this article. Does the engine cooling system leak? YES : REPAIR or INSTALL new components. TEST the system for normal operation. NO : Vehicles equipped with an expansion tank, go to B6 . Vehicles equipped with a degas bottle, go to B7 .
6. B6 CHECK THE PRESSURE RELIEF CAP Carry out the pressure relief cap pressure test. Refer to «Component Tests»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system) , Pressure Relief Cap Pressure Test in this article. Is the pressure relief cap OK? YES : Go to B7 . NO : INSTALL a new pressure relief cap. TEST the system for normal operation.
7. B7 CHECK THE ENGINE COOLANT FOR AN INTERNAL LEAK Inspect the engine coolant in the degas bottle or coolant expansion tank for signs of engine oil or transmission fluid. Is engine oil or transmission fluid evident in the coolant? YES : If engine oil is evident, go to «ENGINE SYSTEM - GENERAL INFORMATION»(/ford/explorer-sport-trac/ii-2006-2010/remont/mechanical/#engine-system-general-information) article for engine diagnosis. If transmission fluid is evident, INSTALL a new radiator. REPAIR the transmission as necessary. Refer to the appropriate Automatic Transmission article for the procedure. TEST the system for normal operation. NO : Go to B8 .
8. B8 CHECK THE ENGINE OIL AND TRANSMISSION FLUID FOR COOLANT Remove the oil level indicators from the engine and the transmission. Is coolant evident in the oil or transmission fluid? YES : If coolant is in the engine oil, go to «ENGINE SYSTEM - GENERAL INFORMATION»(/ford/explorer-sport-trac/ii-2006-2010/remont/mechanical/#engine-system-general-information) article. If coolant is in the transmission fluid, INSTALL a new radiator. REPAIR the transmission as necessary. Refer to the appropriate Automatic Transmission article for the procedure. NO : Go to B9 .
9. B9 CHECK THE COOLING SYSTEM FOR COMBUSTION GASES NOTE: Use U-View® Combustion Leak Tester part number 560000 or equivalent. Using a cooling system combustion gas leak tester, following the instructions supplied with the tester, check the coolant for combustion gases. Are combustion gases present? YES : Go to «ENGINE SYSTEM - GENERAL INFORMATION»(/ford/explorer-sport-trac/ii-2006-2010/remont/mechanical/#engine-system-general-information) article for engine diagnosis. NO : Go to B10 .
10. B10 CHECK COOLANT CONDITION Check the coolant for dirt, rust or contamination and check the coolant concentration. Is the coolant condition OK? YES : Vehicles equipped with an electric cooling fan, go to B11 . Vehicles equipped with only a mechanical cooling fan, go to B12 . NO : FLUSH the engine cooling system. REFER to «Cooling System Flushing»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-flushing) . TEST the system for normal operation.
11. B11 CHECK THE ELECTRIC COOLING FAN OPERATION Start the engine. Place the climate control function selector in the MAX A/C position and the blower motor switch in the HI position. Did the electric cooling fan operate? YES : If the vehicle is also equipped with a mechanical cooling fan, go to B12 . Otherwise, go to B13 . NO : DIAGNOSE the electric cooling fan operation. REFER to «Introduction - Gasoline Engines»(/ford/explorer-sport-trac/ii-2006-2010/remont/testing-diagnostics/#engine-controls-introduction-except-diesel-hybrid) article.
12. B12 CHECK THE MECHANICAL COOLING FAN OPERATION Key in OFF position. If the vehicle is equipped with a viscous fan clutch, carry out the Fan Clutch Tests in the Component Tests portion of this article. If the vehicle is equipped with an electronically actuated fan clutch, refer to the «Introduction - Gasoline Engines»(/ford/explorer-sport-trac/ii-2006-2010/remont/testing-diagnostics/#engine-controls-introduction-except-diesel-hybrid) article. Is the cooling fan operation OK? YES : Go to B13 . NO : INSTALL a new fan clutch. TEST the system for normal operation.
13. B13 CHECK THE COOLANT PUMP OPERATION Start the engine. Allow the engine to run for 10 minutes (hot side thermostat equipped vehicles) or 30 minutes (cold side thermostat equipped vehicles). Place the climate control function selector in the MAX HEAT position. Feel the heater outlet hose. Is the heater outlet hose hot? YES : Go to B14 . NO : INSTALL a new coolant pump. TEST the system for normal operation.
14. B14 CHECK THE THERMOSTAT OPERATION Start the engine. Allow the engine to run for 10 minutes (hot side thermostat equipped vehicles) or 30 minutes (cold side thermostat equipped vehicles). Feel the upper radiator hose (hot side thermostat equipped vehicles) or the lower radiator hose (cold side thermostat equipped vehicles). Is the upper (hot side thermostat equipped vehicles) or lower (cold side equipped vehicles) radiator hose hot? YES : CHECK the engine coolant temperature gauge operation. REFER to «INSTRUMENT CLUSTER (IC), MESSAGE CENTER, AND WARNING CHIMES»(/ford/explorer-sport-trac/ii-2006-2010/remont/gauges-instrument-panels/#information-center) article. NO : Go to B15 .
15. B15 VISUALLY INSPECT THE THERMOSTAT Carry out the Thermostat Visual Inspection in the Component Tests portion of this article. Is the thermostat damaged? YES : INSTALL a new thermostat. TEST the system for normal operation. NO : INSTALL a new thermostat. TEST the system for normal operation. If the engine still overheats, INSTALL a new radiator. TEST the system for normal operation.

The engine cooling system functions to maintain engine temperatures during operation. Correct coolant flow through the engine, radiator and remainder of cooling system passages and components is essential to maintaining a correct engine temperature.

Engine coolant flows primarily from the engine to the radiator circuit and back to the coolant pump. From the coolant pump, coolant is sent through the engine block and cylinder heads. A separate circuit from the engine also feeds the heater core with coolant. On most engines, the coolant pump is operated by engine rotation through a pulley which is driven by the accessory drive belt to circulate the coolant. Some engines use a belt driven by a pulley attached to the camshaft, and some engines use a sprocket driven by the timing chain to operate the coolant pump. The coolant thermostat is a control valve actuated by coolant temperature. When the thermostat is closed, coolant flow bypasses the radiator circuit and returns to the coolant pump. When the thermostat is opened, coolant is allowed to flow through the radiator circuit in order to transfer engine generated heat to the outside air.

Concerns of engine inability to reach normal operating temperature typically occur when the rate of coolant flow through some coolant circuits (radiator, heater core) is more than expected given the conditions, or when the cooling fans operate all the time (electric fans) or the fan clutch is always engaged (engine driven fans). Heat is not allowed to build in the engine because a heat exchanger is removing too much heat, including the radiator, heater core and oil cooler. In addition, perceived concerns that the engine does not reach normal operating temperature can be related to a low coolant level or trapped air which does not allow for hot coolant to be available at the heater core, an inoperative climate control system, or for concerns perceived or related to an incorrect engine temperature gauge indication.

For vehicle/engine specific information, refer to Engine Cooling in the Description and Operation portion of this article.

1. DTC P0125 Insufficient Coolant Temp for Closed Loop Fuel Control
2. DTC P0128 Coolant Thermostat (Coolant Temp Below Thermostat Regulating Temperature)

This pinpoint test is intended to diagnose the following

1. Low coolant level
2. Thermostat
3. Engine coolant temperature (ECT) indicator system (gauge)
4. Engine cooling fan

PINPOINT TEST C: THE ENGINE DOES NOT REACH NORMAL OPERATING TEMPERATURE

1. C1 CARRY OUT INSPECTION AND VERIFICATION Carry out the Inspection and Verification procedure in this article. Were any concerns found? YES : REPAIR as needed. TEST the system for normal operation. NO : Go to C2 .
2. C2 CHECK FOR DTCs P0125 or P0128 NOTE: Refer to the «Introduction - Gasoline Engines»(/ford/explorer-sport-trac/ii-2006-2010/remont/testing-diagnostics/#engine-controls-introduction-except-diesel-hybrid) article for correct scan tool hook-up procedure. Check for DTC P0125 or P0128. Is DTC P0125 or P0128 present? YES : If the vehicle is equipped with an electric cooling fan, go to C3 . If the vehicle is equipped with only a mechanical cooling fan, go to C4 . NO : The cooling system is operational. If an inoperative engine coolant temperature gauge is suspected, CHECK the engine coolant temperature gauge operation. REFER to «INSTRUMENT CLUSTER (IC), MESSAGE CENTER, AND WARNING CHIMES»(/ford/explorer-sport-trac/ii-2006-2010/remont/gauges-instrument-panels/#information-center) article. If an inoperative climate control system is suspected, CHECK the climate control system operation. REFER to «CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS»(/ford/explorer-sport-trac/ii-2006-2010/remont/manual-hvac-system/#hvac-system-general-information-and-diagnostics) article. If any other DTCs are retrieved, REFER to the «Introduction - Gasoline Engines»(/ford/explorer-sport-trac/ii-2006-2010/remont/testing-diagnostics/#engine-controls-introduction-except-diesel-hybrid) article.
3. C3 CHECK THE ELECTRIC COOLING FAN OPERATION Allow the engine to cool. Make sure the A/C switch is OFF (if equipped). Start the engine. Check the electric cooling fan. Is the electric cooling fan on all the time? YES : DIAGNOSE the electric cooling fan operation. REFER to the «Introduction - Gasoline Engines»(/ford/explorer-sport-trac/ii-2006-2010/remont/testing-diagnostics/#engine-controls-introduction-except-diesel-hybrid) article. NO : If the vehicle is also equipped with a mechanical cooling fan, go to C4 . Otherwise, go to C5 .
4. C4 CHECK THE MECHANICAL COOLING FAN OPERATION Carry out the Cooling Fan Clutch Component Test. For a mechanical cooling fan clutch, refer to «Component Tests»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system) . For an electronic cooling fan clutch, refer to the «Introduction - Gasoline Engines»(/ford/explorer-sport-trac/ii-2006-2010/remont/testing-diagnostics/#engine-controls-introduction-except-diesel-hybrid) article. Is the cooling fan clutch OK? YES : Go to C5 . NO : INSTALL a new cooling fan clutch. TEST the system for normal operation.
5. C5 CHECK THE COOLANT LEVEL NOTE: Allow the engine to cool before checking the coolant level. Visually check the engine coolant level in the degas bottle or coolant expansion tank. Is the engine coolant level within specification? YES : INSTALL a new thermostat. TEST the system for normal operation. NO : Go to «Pinpoint Test A»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system__pinpoint-test-a-loss-of-coolant) to diagnose a coolant leak.

Pressure Test - Degas Bottle Systems

Note. Vehicles equipped with a degas bottle system have the pressure relief cap on the degas bottle and no radiator cap. Vehicles equipped with a coolant expansion tank system have the pressure relief cap on the radiator.

1. Turn the engine OFF.
2. Check the engine coolant level. Adjust the coolant level as necessary.
3. Attach the Radiator/Heater Core Pressure Tester to the degas bottle nipple and overflow hose. Install a pressure test pump to the quick connect fitting of the test adapter.
4. Slowly depress the plunger of the pressure test pump until the pressure gauge reading stops increasing and note the highest pressure reading obtained. If the pressure reading exceeds the maximum cap pressure listed in the specifications table, install a new pressure relief cap.
5. If the system does not hold pressure, remove the pressure relief cap and wash in clean water to dislodge all the foreign material from the gasket. Check the sealing surface in the filler neck of the degas bottle for nicks or cuts. Install the pressure relief cap.
6. Pressurize the engine cooling system as described in Step 4 above. Observe the gauge reading for approximately 2 minutes. Pressure should not drop during this time. If the pressure drops within this time, inspect for leaks and repair as necessary.
7. If no leaks are found and the pressure drops. the pressure relief cap may be leaking. Install a new pressure relief cap and retest the system.
8. If no leaks are found after a new pressure relief cap is installed, and the pressure drops, the leak may be internal to the radiator transmission cooler (if equipped). Inspect the coolant for transmission fluid and the transmission fluid for coolant. Repair as necessary.
9. If there is no contamination of the coolant or transmission fluid, the leak may be internal to the engine. Inspect the coolant for engine oil and the engine oil for coolant. Refer to «ENGINE SYSTEM - GENERAL INFORMATION»(/ford/explorer-sport-trac/ii-2006-2010/remont/mechanical/#engine-system-general-information) article to diagnose the engine.
10. Release the system pressure by loosening the pressure relief cap. Check the coolant level and adjust as necessary.

Pressure Test - Coolant Expansion Tank Systems

Note. Vehicles equipped with a degas bottle system have the pressure relief cap on the degas bottle and no radiator cap. Vehicles equipped with a coolant expansion tank system have the pressure relief cap on the radiator.

1. Turn the engine OFF.
2. Remove the pressure relief cap. Top off the radiator as needed. Fit the pressure tester to the radiator fill neck.
3. Pump the cooling system to a maximum of 138 kPa (20 psi) and hold for 2 minutes. If the pressure drops within this time, inspect for leaks and repair as necessary.
4. If no leaks are found and the pressure drops, the leak may be internal to the radiator transmission cooler (if equipped). Inspect the coolant for transmission fluid and the transmission fluid for coolant. Repair as necessary.
5. If there is no contamination of the coolant or transmission fluid, the leak may be internal to the engine. Inspect the coolant for engine oil and the engine oil for coolant. Refer to «ENGINE SYSTEM - GENERAL INFORMATION»(/ford/explorer-sport-trac/ii-2006-2010/remont/mechanical/#engine-system-general-information) article to diagnose the engine.

Cap

1. Inspect the pressure relief cap and seals for damage or deterioration. Install a new pressure relief cap if necessary.
2. Fit the pressure relief cap to the Radiator/Heater Core Pressure Tester Kit using the correct adapter.
3. Slowly pump the pressure tester until the pressure gauge stops increasing and note the highest pressure reading. Release the pressure and repeat the test. Install a new pressure relief cap if the pressure is not within specification. Refer to the «SPECIFICATIONS»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system) .

Thermostat

A new thermostat should be installed only after the following tests and checks have been carried out

1. Pinpoint Test A, B or C
2. Thermostat Visual Inspection

Thermostat Visual Inspection

1. Remove the thermostat.
2. Examine the thermostat for signs of damage including: Valve not fully seated (light visible through the valve) Foreign material lodged in the main valve Bent or broken frame or flange Bent or broken spring Bent or broken valve or valve stem Wax leaking from wax reservoir or a bulge in the reservoir Any other damage or distortion
3. If damage is found during the inspection, remove any foreign material or broken pieces and install a new thermostat.
4. If no damage is found during the inspection, continue troubleshooting the system concern. Go to the Symptom Chart for further instructions.

Radiator Leak Test, Removed From Vehicle

Note. Never leak test an aluminum radiator in the same water that copper/brass radiators are tested in. Flux and caustic cleaners may be present in the cleaning tank and they will damage aluminum radiators.

Note. Always install plugs in the oil cooler fittings before leak testing or cleaning any radiator.

Note. Clean the radiator before leak testing to avoid contamination of tank.

1. Leak test the radiator in clean water with 138 kPa (20 psi) air pressure.

Fan Clutch Test

1. Turn the engine OFF and wait until the fan comes to a complete stop.
2. Spin the fan blade by hand. A light resistance should be felt. If there is no resistance or very high resistance, the minimum and maximum fan speeds must be checked. For an electronically actuated fan clutch, refer to the «Introduction - Gasoline Engines»(/ford/explorer-sport-trac/ii-2006-2010/remont/testing-diagnostics/#engine-controls-introduction-except-diesel-hybrid) article. For a viscous fan clutch, carry out the following

Fan Clutch Test - Minimum Speed Requirement

1. Use a suitable marker to mark the coolant pump or fan pulley and one of the fan blades.
2. Make sure the A/C is OFF, if equipped.
3. Start the engine and run it at approximately 2,000 RPM for 5 minutes or until there is a noticeable reduction in fan noise to allow the fan clutch to go into disengaged mode.
4. Aim a laser photo tachometer at the coolant pump or fan pulley. Run the engine to achieve 3,000 RPM at the coolant pump or fan pulley.
5. With the coolant pump or fan pulley at 3,000 RPM, aim the laser photo tachometer at the fan blade. Monitor and record fan speed.
6. The fan blade speed must be less than the specified RPM at 3,000 RPM coolant pump or fan pulley RPM. Refer to «SPECIFICATIONS»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system) for correct fan speed.
7. Turn the engine off.
8. If the fan blade speed was greater than specified, install a new fan clutch.

Fan Clutch Test - Maximum Speed Requirement

1. Use a suitable marker to mark the coolant pump or fan pulley and one of the fan blades.
2. Block off areas on each side of the radiator in the engine compartment, the front of the radiator grille and the bumper. Close the hood. This will raise the temperature of the air striking the fan clutch and should cause the fan blade to operate at maximum speed.
3. Place the climate control function selector switch in the MAX A/C position and the blower motor switch in the HI position, if equipped.
4. Start the engine and run it at approximately 2,000 RPM until normal operating temperature has been achieved. Using an infrared thermometer, monitor the coolant pump or fan pulley. Run the engine until the coolant pump or fan pulley is at least 96°C (205°F).
5. Aim a laser photo tachometer at the coolant pump or fan pulley. Run the engine to achieve 3,000 RPM at the coolant pump or fan pulley.
6. With the coolant pump or fan pulley at 3,000 RPM, aim the laser photo tachometer at the fan blade. Monitor and record fan blade speed.
7. The fan blade speed must be greater than the specified RPM at 3,000 RPM coolant pump or fan pulley RPM. Refer to «SPECIFICATIONS»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system) for correct fan speed.
8. Open the hood and allow the engine to idle momentarily to lower engine temperature. Turn the engine off and remove the blocks from the radiator, grille and bumper.
9. If the fan blade speed is less than specified, install a new fan clutch.

Cooling System Draining, Filling and Bleeding

Special Tools Illustration Tool Name Tool Number RADKITPLUS 078-00497

Scheme 9

Material

Draining

Note. The addition of Cooling System Stop Leak Pellets VC-6 darkens Motorcraft Premium Gold Engine Coolant from yellow to golden tan.

Note. Less than 80 percent of the coolant capacity can be recovered with the engine in the vehicle. Dirty, rusty or contaminated coolant requires replacement.

1. Make sure the engine is cool.
2. Wrap a thick cloth around the radiator cap. Slowly turn the cap counterclockwise (left) until the pressure begins to release.
3. Step back while the pressure releases.
4. When you are sure all the pressure has been released, use the cloth to turn and remove the cap.
5. Place a suitable container below the radiator draincock. Drain the coolant. Tighten the radiator draincock when finished.

Filling and Bleeding with RADKITPLUS

1. Using the special tool, install the RADKITPLUS and follow the RADKITPLUS manufacturer's instructions to fill and bleed the cooling system.

Filling and Bleeding without RADKITPLUS

Note. Engine coolant provides freeze protection, boil protection, cooling efficiency and corrosion protection to the engine and cooling components. In order to obtain these protections, the engine coolant must be maintained at the correct concentration and fluid level. When adding engine coolant, use a 50/50 mixture of distilled water and engine coolant. To maintain the integrity of the coolant and the cooling system: add Motorcraft Premium Gold Engine Coolant. Always fill the cooling system with the same type of coolant that was drained from the system. Do not mix coolant types. do not add orange-colored Motorcraft Specialty Orange Engine Coolant. Mixing coolants may degrade the coolant's corrosion protection. do not add alcohol, methanol or brine, or any engine coolants mixed with alcohol or methanol antifreeze. These can cause engine damage from overheating or freezing. do not mix with recycled coolant. Use of such coolants may harm the engine and cooling system components.

4.6L (3V) engine

1. Remove the thermostat. For additional information, refer to «Thermostat - 4.6L (3V)»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system) .
2. Disconnect the heater hose and insert the end of the heater hose into a suitable container.
3. Fill the engine through the thermostat housing until coolant flows from the heater hose.
4. Connect the heater hose.
5. Install the thermostat. For additional information, refer to «Thermostat - 4.6L (3V)»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system) .
6. Fill the radiator through the radiator filler neck until the coolant level is at the bottom of the filler neck.
7. Install the radiator cap.
8. Fill the coolant expansion tank until the coolant reaches the COLD FILL mark.
9. Select the maximum heater temperature and blower motor speed settings. Position the control to discharge air from the A/C vents.
10. Run the engine until it reaches normal operating temperature.
11. Turn the engine off and allow the engine to cool.
12. Add more coolant mixture to the coolant expansion tank until the coolant level is at the COLD FILL mark.
13. Start the engine and allow it to idle. While the engine is idling, feel for hot air from the A/C vents. Hot air should discharge from the A/C vents. The engine coolant temperature gauge should maintain a stabilized reading in the middle of the NORMAL range and the upper radiator hose should feel hot to the touch.
14. Check the engine coolant level in the coolant expansion tank and fill it as necessary.
15. Repeat previous 5 steps as necessary.

Cooling System Flushing

Material

All vehicles

1. Drain the cooling system. For additional information, refer to «Cooling System Draining, Filling and Bleeding»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-filling-and-bleeding) .
2. Remove the bolts, thermostat housing cover and thermostat. Install the thermostat housing cover and bolts without the thermostat. Tighten to 10 Nm (89 lb-in).
3. Remove the throttle body (TB). For additional information, refer to «FUEL CHARGING AND CONTROLS - 4.6L (3V)»(/ford/explorer-sport-trac/ii-2006-2010/remont/fuel-system/#fuel-system-and-engine-controls-46l-3v) article.
4. Disconnect the fuel vapor hose.
5. Remove the bolts, thermostat housing cover and thermostat. Install the thermostat housing cover, the O-ring seal and the bolts without the thermostat. Tighten to 10 Nm (89 lb-in).
6. Using a suitable cooling system flushing tool, flush the engine and radiator. Use cooling system flush.
7. Install the thermostat, O-ring seal, thermostat housing cover and bolts. Tighten to 10 Nm (89 lb-in).
8. Install the thermostat, O-ring seal, thermostat housing cover and bolts. Tighten to 10 Nm (89 lb-in).
9. Connect the fuel vapor hose.
10. Install the TB. For additional information, refer to «FUEL CHARGING AND CONTROLS - 4.6L (3V)»(/ford/explorer-sport-trac/ii-2006-2010/remont/fuel-system/#fuel-system-and-engine-controls-46l-3v) article.
11. Fill and bleed the cooling system. For additional information, refer to «Cooling System Draining, Filling and Bleeding»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-filling-and-bleeding) .

Block Heater

Material

Scheme 10

1. With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to «JACKING AND LIFTING»(/ford/explorer-sport-trac/ii-2006-2010/remont/hoistjack/#jacking-and-lifting) article.
2. Drain the cooling system. For additional information, refer to «Cooling System Draining, Filling and Bleeding»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-filling-and-bleeding) .
3. Disconnect the block heater power cable.
4. Loosen the screw and remove the block heater. To install, tighten to 4 N.m (35 lb-in).
5. Clean and inspect the engine block mating surface. Lubricate the block heater seal and the cylinder block hole with clean engine coolant.
6. To install, reverse the removal procedure.

Coolant Expansion Tank

Material

Scheme 11

1. Disconnect the coolant overflow hose.
2. If equipped, detach the mass air flow (MAF) sensor wiring harness retainer.
3. Remove the bolts and the coolant expansion tank. To install, tighten to 7 Nm (62 lb-in).
4. To install, reverse the removal procedure. Fill the coolant expansion tank with a 50/50 mixture of coolant and clean, drinkable water.

Scheme 12

1. For additional information, refer to the procedures in this article.

REMOVAL AND INSTALLATION

1. Drain the engine cooling system. For additional information, refer to «Cooling System Draining, Filling and Bleeding»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-filling-and-bleeding) .
2. Release the clamp and disconnect the upper radiator hose from the thermostat housing cover.
3. Remove the bolts and the thermostat housing cover. To install, tighten to 10 N.m (89 lb-in).
4. Remove the thermostat.
5. To install, reverse the removal procedure.

1. Drain the engine cooling system. For additional information, refer to «Cooling System Draining, Filling and Bleeding»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-filling-and-bleeding) .
2. Disconnect the engine coolant temperature (ECT) sensor electrical connector.
3. Release the clamp and disconnect the upper radiator hose.
4. Release the clamp and disconnect the heater hose.
5. Release the bypass hose clamp and position it down the hose.
6. Remove the bolts and the thermostat housing. To install, tighten to 12 N.m (9 lb-ft).
7. Inspect the thermostat housing O-ring seal. Install a new O-ring seal if necessary.
8. To install, reverse the removal procedure.

Scheme 13

1. Drain the cooling system. For additional information, refer to «Cooling System Draining, Filling and Bleeding»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-filling-and-bleeding) .
2. Remove the throttle body. For additional information, refer to «FUEL CHARGING AND CONTROLS - 4.6L (3V)»(/ford/explorer-sport-trac/ii-2006-2010/remont/fuel-system/#fuel-system-and-engine-controls-46l-3v) article.
3. Disconnect the fuel vapor tube.
4. Remove the bolts and position the thermostat housing cover aside.
5. Remove the O-ring seal and the thermostat.

INSTALLATION

1. Install the thermostat with the spring facing down.
2. Install the O-ring seal.
3. Position the thermostat housing cover and the bolts. Tighten to 10 Nm (89 lb-in).
4. Connect the fuel vapor hose.
5. Install the throttle body. For additional information, refer to «FUEL CHARGING AND CONTROLS - 4.6L (3V)»(/ford/explorer-sport-trac/ii-2006-2010/remont/fuel-system/#fuel-system-and-engine-controls-46l-3v) article.
6. Fill and bleed the cooling system. For additional information, refer to «Cooling System Draining, Filling and Bleeding»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-filling-and-bleeding) .

Coolant Pump - 4.0L SOHC

Material

Scheme 14

1. Drain the engine cooling system. For additional information, refer to «Cooling System Draining, Filling and Bleeding»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-filling-and-bleeding) .
2. Remove the cooling fan. For additional information, refer to «Cooling Fan»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system__cooling-fan) .
3. Remove the accessory drive belt. For additional information, refer to «ACCESSORY DRIVE»(/ford/explorer-sport-trac/ii-2006-2010/remont/accessory-drive-belts/#accessory-drive-system) article.
4. Remove the bolts and the coolant pump pulley. To install, tighten to 25 N.m (18 lb-ft).
5. Release the clamp and disconnect the coolant pump bypass hose.
6. Release the clamp and disconnect the heater hose.
7. Release the clamp and disconnect the lower radiator hose.
8. Remove the bolts, the coolant pump and the gasket. To install, tighten to 10 N.m (89 lb-in).
9. Clean the mating surfaces with a plastic scraper and metal surface prep. Follow the directions on the packaging.
10. To install, reverse the removal procedure. Install a new coolant pump gasket.

Coolant Pump - 4.6L (3V)

Material

Scheme 15

1. Drain the cooling system. For additional information, refer to «Cooling System Draining, Filling and Bleeding»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-filling-and-bleeding) .
2. Remove the cooling fan. For additional information, refer to «Cooling Fan»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system__cooling-fan) .
3. Remove the accessory drive belt. For additional information, refer to «ACCESSORY DRIVE»(/ford/explorer-sport-trac/ii-2006-2010/remont/accessory-drive-belts/#accessory-drive-system) article.
4. Remove the bolts and the coolant pump pulley. To install, tighten to 25 N.m (18 lb-ft).
5. Remove the bolts and the coolant pump. To install, tighten to 25 N.m (18 lb-ft).
6. Remove and discard the coolant pump O-ring.
7. Clean the mating surfaces with a plastic scraper, if necessary, and metal surface prep. Follow the directions on the packaging.
8. To install, reverse the removal procedure. Install a new coolant pump O-ring. Lubricate the O-ring with clean engine coolant.

Scheme 16

Scheme 17

Scheme 18

1. Drain the engine cooling system. For additional information, refer to «Cooling System Draining, Filling and Bleeding»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-filling-and-bleeding) .
2. Remove the intake manifold. For additional information, refer to «ENGINE - 4.6L (3V)»(/ford/explorer-sport-trac/ii-2006-2010/remont/mechanical/#engine-46l-3v) article.
3. Rotate the accessory drive belt tensioner clockwise and detach the belt from the generator pulley.
4. Disconnect the electrical connector.
5. Loosen the generator nuts. To install, tighten to 25 Nm (18 lb-ft).
6. Remove the generator bracket-to-coolant crossover bolts, and position the generator, bracket and wiring harness aside as an assembly. To install, tighten to 10 Nm (89 lb-in).
7. Disconnect the PCV heater hose from the coolant crossover manifold assembly.
8. Disconnect the heater hose from the coolant crossover manifold assembly.
9. Disconnect the upper radiator hose from the coolant crossover manifold assembly.
10. Remove the bolts, the coolant crossover manifold assembly and the gaskets. Discard the gaskets. To install, tighten to 10 Nm (89 lb-in).
11. To install, reverse the removal procedure. Install new gaskets.

Scheme 19

Scheme 20

Scheme 21

Scheme 22

Scheme 23

1. For additional information, refer to the procedures in this article.

Radiator

Special Tools Illustration Tool Name Tool Number Disconnect Tool, Transmission Cooler Line 307-569 Holding Wrench, Fan Pulley 303-239 (T84T-6312-C) Wrench, Fan Clutch Nut 303-240 (T84T-6312-D)

All vehicles

1. With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to «JACKING AND LIFTING»(/ford/explorer-sport-trac/ii-2006-2010/remont/hoistjack/#jacking-and-lifting) article.
2. Drain the cooling system. For additional information, refer to «Cooling System Draining, Filling and Bleeding»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system__cooling-system-draining-filling-and-bleeding) .
3. Remove the air cleaner outlet pipe. For additional information, refer to «INTAKE AIR DISTRIBUTION AND FILTERING»(/ford/explorer-sport-trac/ii-2006-2010/remont/removal-installation/#intake-air-distribution-system-and-filtering-system) article.
4. Remove the coolant expansion tank. For additional information, refer to «Coolant Expansion Tank»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system__coolant-expansion-tank) .
5. Remove the bolt and position the power steering fluid reservoir aside. To install, tighten to 10 Nm (89 lb-in).
6. Release the clamp and disconnect the upper radiator hose.
7. Release the clamp and disconnect the lower radiator hose.
8. Detach the lower radiator hose retainer from the lower fan shroud.
9. Detach the transmission cooler hose retainer from the RH radiator support bracket.
10. Remove the 4 lower radiator air deflector pushpins.
11. Remove the latch assemblies from the transmission cooler tubes.
12. Using the special tool, disconnect the transmission cooler tubes.
13. Remove the upper fan shroud bolts, then unclip the upper fan shroud from the lower fan shroud and remove the upper fan shroud. To install, tighten to 7 Nm (62 lb-in).
14. Disconnect the fan clutch electrical connector.
15. Remove the fan clutch wiring harness bracket bolt. To install, tighten to 7 Nm (62 lb-in).
16. Using the special tools, remove the cooling fan. To install, tighten to 55 Nm (41 lb-ft).
17. Remove the bolts and the lower fan shroud.
18. Detach the A/C tube from the retainer on the radiator support bracket.
19. Remove the radiator support bracket-to-radiator support bracket bolts. To install, tighten to 15 Nm (11 lb-ft).
20. Remove the radiator top seal.
21. Deflect the A/C condenser seals and remove the A/C condenser-to-radiator support bracket bolts. Position the A/C condenser aside. To install, tighten to 12 Nm (9 lb-ft).
22. Remove the radiator and the radiator support brackets as an assembly.
23. Remove the bolts and separate the radiator support brackets and the radiator. To install, tighten to 12 Nm (9 lb-ft).
24. To install, reverse the removal procedure.

Cooling Fan

Special Tools Illustration Tool Name Tool Number Holding Wrench, Fan Pulley 303-239 (T84T-6312-C) Wrench, Fan Clutch Nut 303-240 (T84T-63112-D

Vehicle equipped with a 4.6L (3V)

1. Remove the air cleaner outlet pipe. For additional information, refer to «INTAKE AIR DISTRIBUTION AND FILTERING»(/ford/explorer-sport-trac/ii-2006-2010/remont/removal-installation/#intake-air-distribution-system-and-filtering-system) article.
2. Remove the coolant expansion tank. For additional information, refer to «Coolant Expansion Tank»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system__coolant-expansion-tank) .
3. Remove the bolt and position the power steering fluid reservoir aside. To install, tighten to 10 Nm (89 lb-in).
4. Remove the bolts, then unclip the upper fan shroud from the lower fan shroud and remove the upper fan shroud. To install, tighten to 7 Nm (62 lb-in).
5. Disconnect the fan clutch electrical connector.
6. Remove the fan clutch wiring harness bracket bolt. To install, tighten to 7 Nm (62 lb-in).
7. Using the special tools, remove the cooling fan. To install, tighten to 55 Nm (41 lb-ft).
8. Remove the bolts and separate the fan from the fan clutch. To install, tighten to 7 Nm (62 lb-in).
9. If necessary, unclip and disconnect the fan clutch wiring harness.
10. To install, reverse the removal procedure.

Cooling Fan Shroud

Special Tools Illustration Tool Name Tool Number Holding Wrench, Fan Pulley 303-239 (T84T-6312-C) Wrench, Fan Clutch Nut 303-240 (T84T-63112-D

Vehicles equipped with a 4.6L (3V) engine

1. Remove the air cleaner outlet pipe. For additional information, refer to «INTAKE AIR DISTRIBUTION AND FILTERING»(/ford/explorer-sport-trac/ii-2006-2010/remont/removal-installation/#intake-air-distribution-system-and-filtering-system) article.
2. Remove the coolant expansion tank. For additional information, refer to «Coolant Expansion Tank»(/ford/explorer-sport-trac/ii-2006-2010/remont/cooling-system-mechanical/#engine-cooling-system__coolant-expansion-tank) .
3. Remove the bolt and position the power steering fluid reservoir aside. To install, tighten to 10 Nm (89 lb-in).
4. Remove the bolts, then unclip the upper fan shroud from the lower fan shroud and remove the upper fan shroud. To install, tighten to 7 Nm (62 lb-in).
5. Disconnect the fan clutch electrical connector.
6. Remove the fan clutch wiring harness bracket bolt. To install, tighten to 7 Nm (62 lb-in).
7. Using the special tools, remove the cooling fan. To install, tighten to 55 Nm (41 lb-ft).
8. Remove the bolts and the lower fan shroud. To install, tighten to 7 Nm (62 lb-in).
9. To install, reverse the removal procedure.

See also:
• ENGINE SYSTEM - GENERAL INFORMATION
• MODULE COMMUNICATIONS NETWORK
• MULTIFUNCTION ELECTRONIC MODULES
• Introduction - Gasoline Engines
• INSTRUMENT CLUSTER (IC), MESSAGE CENTER, AND WARNING CHIMES
• CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS
• FUEL CHARGING AND CONTROLS - 4.6L (3V)
• JACKING AND LIFTING
• ACCESSORY DRIVE
• ENGINE - 4.6L (3V)
• INTAKE AIR DISTRIBUTION AND FILTERING
• Engine Cooling
• Pinpoint Test B
• Pinpoint Test C
• Pinpoint Test A
• Cooling System Flushing
• Cooling System Draining, Filling and Bleeding
• Cooling Fan
• Coolant Expansion Tank