Engine Cooling System - f-150 & Mark LT Lincoln Mark LT I

Material

Material

GENERAL SPECIFICATIONS

GENERAL SPECIFICATIONS

TORQUE SPECIFICATIONS

TORQUE SPECIFICATIONS

a Refer to the procedure in this article.

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

The cooling system consists of the

1. Block heater
2. Coolant crossover manifold assembly (4.6L, 5.4L)
3. Degas bottle
4. Fan blade
5. Mechanical fan clutch (4.2L)
6. Electronic fan clutch (4.6L, 5.4L)
7. Fan shroud
8. Radiator
9. Pressure relief cap
10. Radiator draincock
11. Upper and lower radiator hoses
12. Coolant pump
13. Coolant thermostat

The block heater

1. warms the coolant during extreme cold weather conditions.
2. uses 110V AC electrical source.

The coolant crossover manifold

1. provides for coolant flow between the cylinder heads.
2. houses the thermostat.
3. has an attachment for the heater hose.

The degas bottle

1. holds surplus coolant when hot.
2. de-aerates the system reducing hot spots.
3. is the location for service fill.
4. allows coolant expansion and system pressurization.
5. replenishes coolant to the system.

The fan blade draws air through the radiator to help cool the system coolant.

The fan clutch controls the fan speed.

The fan shroud directs air flow through the radiator

The radiator

1. allows excess heat to be transferred to the air.
2. cannot be serviced. Install a new radiator.

The pressure relief cap

1. provides for cooling system pressurization.
2. is the location for service fill.

The radiator draincock

1. provides for cooling system draining.

The radiator hoses

1. allow coolant flow between the engine and the radiator

The coolant pump

1. circulates the coolant.

The coolant thermostat

1. controls coolant temperature.
2. allows quicker engine warm-up.

The engine coolant flows

1. from the lower radiator hose to the coolant pump.
2. from the coolant pump to the engine block, the cylinder heads, heater core and PCV fittings.

1. thermostat closed, the coolant returns to the coolant pump.
2. thermostat open, the coolant flows back to the radiator for heat rejection.

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

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 (yellow color). 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, methanol or brine 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.

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

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 4

Scheme 5

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 will be illuminated.

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

Inspection and Verification

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 chart 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»(/lincoln/mark-lt/i-2005-2009/remont/mechanical/#engine-system-general-information-f-150-mark-lt) article. A milky brown color may indicate that engine oil is entering the cooling system. Pressure test the cooling system. Refer to component tests in this article. If engine oil is suspected, the cause of the leak may be internal to the engine. Refer to «ENGINE SYSTEM - GENERAL INFORMATION»(/lincoln/mark-lt/i-2005-2009/remont/mechanical/#engine-system-general-information-f-150-mark-lt) 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 in this section. 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»(/lincoln/mark-lt/i-2005-2009/remont/communication-devices/#module-communications-network-f-150-mark-lt) 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»(/lincoln/mark-lt/i-2005-2009/remont/communication-devices/#module-communications-network-f-150-mark-lt) 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»(/lincoln/mark-lt/i-2005-2009/remont/communication-devices/#module-communications-network-f-150-mark-lt) 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 Chart. For all other DTCs, refer to «MULTIFUNCTION ELECTRONIC MODULES»(/lincoln/mark-lt/i-2005-2009/remont/communication-devices/#multifunction-electronic-module-f-150-mark-lt) article.
16. If no DTCs related to the concern are retrieved, go to «Symptom Chart»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt) . PCM DTC CHART DTC Description Action P0217 Engine Coolant Overtemperature Condition Go to «Pinpoint Test B»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt__pinpoint-test-b-the-engine-overheats) . P1285 Cylinder Head Overtemperature Condition Go to «Pinpoint Test B»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt__pinpoint-test-b-the-engine-overheats) . P1299 Cylinder Head Overtemperature Protection Active Go to «Pinpoint Test B»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt__pinpoint-test-b-the-engine-overheats) . P0125 Insufficient Coolant Temp For Closed Loop Fuel Control Go to «Pinpoint Test C»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt__pinpoint-test-c-the-engine-does) . P0128 Coolant Thermostat (Coolant Temp Below Thermostat Regulating Temperature) Go to «Pinpoint Test C»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt__pinpoint-test-c-the-engine-does) . P0480 P0481 P0482 Fan 1, 2 or 3 Control Circuit, Respectively REFER to the «INTRODUCTION - GASOLINE ENGINES»(/lincoln/mark-lt/i-2005-2009/remont/testing-diagnostics/#engine-controls-introduction-except-diesel-hybrid) article. All Other DTCs - REFER to the «INTRODUCTION - GASOLINE ENGINES»(/lincoln/mark-lt/i-2005-2009/remont/testing-diagnostics/#engine-controls-introduction-except-diesel-hybrid) article.

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 section.

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, 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 Test, 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»(/lincoln/mark-lt/i-2005-2009/remont/mechanical/#engine-system-general-information-f-150-mark-lt) 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»(/lincoln/mark-lt/i-2005-2009/remont/mechanical/#engine-system-general-information-f-150-mark-lt) 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»(/lincoln/mark-lt/i-2005-2009/remont/mechanical/#engine-system-general-information-f-150-mark-lt) 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 section.

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»(/lincoln/mark-lt/i-2005-2009/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»(/lincoln/mark-lt/i-2005-2009/remont/gauges-instrument-panels/#instrument-cluster-system-f-150-mark-lt) article. If any other DTCs are retrieved, REFER to the «INTRODUCTION - GASOLINE ENGINES»(/lincoln/mark-lt/i-2005-2009/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 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, 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 Test, 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»(/lincoln/mark-lt/i-2005-2009/remont/mechanical/#engine-system-general-information-f-150-mark-lt) 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»(/lincoln/mark-lt/i-2005-2009/remont/mechanical/#engine-system-general-information-f-150-mark-lt) 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»(/lincoln/mark-lt/i-2005-2009/remont/mechanical/#engine-system-general-information-f-150-mark-lt) 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»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt__cooling-system-flushing) in this article. 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»(/lincoln/mark-lt/i-2005-2009/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 section. If the vehicle is equipped with an electronically actuated fan clutch, refer to the «INTRODUCTION - GASOLINE ENGINES»(/lincoln/mark-lt/i-2005-2009/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»(/lincoln/mark-lt/i-2005-2009/remont/gauges-instrument-panels/#instrument-cluster-system-f-150-mark-lt) article. NO : Go to B15 .
15. B15 VISUALLY INSPECT THE THERMOSTAT Carry out the Thermostat Visual Inspection in the Component Tests portion of this section. 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 section.

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»(/lincoln/mark-lt/i-2005-2009/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»(/lincoln/mark-lt/i-2005-2009/remont/gauges-instrument-panels/#instrument-cluster-system-f-150-mark-lt) article. If an inoperative climate control system is suspected, CHECK the climate control system operation. REFER to «CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS»(/lincoln/mark-lt/i-2005-2009/remont/manual-hvac-system/#hvac-control-system-general-information-and-diagnostics-f-150-mark-lt) article. If any other DTCs are retrieved, REFER to the «INTRODUCTION - GASOLINE ENGINES»(/lincoln/mark-lt/i-2005-2009/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»(/lincoln/mark-lt/i-2005-2009/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 in this article. For an electronic cooling fan clutch, refer to the «INTRODUCTION - GASOLINE ENGINES»(/lincoln/mark-lt/i-2005-2009/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»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt__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»(/lincoln/mark-lt/i-2005-2009/remont/mechanical/#engine-system-general-information-f-150-mark-lt) 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»(/lincoln/mark-lt/i-2005-2009/remont/mechanical/#engine-system-general-information-f-150-mark-lt) 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 General Specifications chart in this article.

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. 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»(/lincoln/mark-lt/i-2005-2009/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 the specification table in this article 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 the specification table in this article 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 6

Material

Draining

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

Note. Less than 80% 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 coolant pressure relief cap on the degas bottle. 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. The addition of Cooling System Stop Leak Pellets darkens Motorcraft Premium Gold Engine Coolant from yellow to golden tan.

1. Fill the radiator through the degas bottle until the coolant level is between the COOLANT FILL LEVEL marks.
2. On the electronic manual temperature control (EMTC), move the temperature blend selector to the full WARM position. On the electronic automatic temperature control (EATC), set the temperature to 32°C (90°F).
3. Run the engine at idle until it reaches normal operating temperature.
4. Add the correct coolant mixture to the degas bottle until the coolant level is at the upper COOLANT FILL LEVEL mark.
5. Repeat Steps 6 through 9 until the degas bottle level is correct.
6. Select the maximum heater temperature and blower motor speed settings. Position the control to discharge air at the A/C vents.
7. Start the engine and allow it to idle until it reaches normal operating temperature. 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.
8. Check the engine coolant level in the degas bottle and fill it as necessary.
9. Shut the engine off and allow it to cool.
10. Check the cooling system for leaks.
11. Install the pressure relief cap to the degas bottle.

Cooling System Flushing

Special Tools Illustration Tool Name Tool Number Coolant System Drain/Flush/Fill 164-R3673 or equivalent Drain Kit 164-R3662 or equivalent Flush Kit 164-R3658

Material

1. Drain the engine cooling system. For additional information, refer to «Cooling System Draining, Filling and Bleeding»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt__cooling-system-draining-filling-and-bleeding) in this article.
2. Remove the thermostat. For additional information, refer to «Thermostat - 4.2L»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt__thermostat-42l) , «Thermostat - 4.6L (2V)»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt) or «Thermostat - 5.4L (3V)»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt__thermostat-54l-3v) in this article.
3. Install the thermostat housing without the thermostat.
4. Use cooling system Flush-All, Flush Kit Hardware Package and Drain kit to flush the engine and radiator. Use Premium Cooling System Flush.
5. Install the thermostat. For additional information, refer to «Thermostat - 4.2L»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt__thermostat-42l) , «Thermostat - 4.6L (2V)»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt) or «Thermostat - 5.4L (3V)»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt__thermostat-54l-3v) in this article.
6. Fill and bleed the cooling system. For additional information, refer to «Cooling System Draining, Filling and Bleeding»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt__cooling-system-draining-filling-and-bleeding) in this article.

Block Heater

Material

Scheme 7

REMOVAL AND INSTALLATION

1. With the vehicle in NEUTRAL, position it on a hoist. For additional information, refer to «JACKING AND LIFTING»(/lincoln/mark-lt/i-2005-2009/remont/hoistjack/#jacking-and-lifting-f-150-mark-lt) article.
2. Drain the engine cooling system. For additional information, refer to «Cooling System Draining, Filling and Bleeding»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt__cooling-system-draining-filling-and-bleeding) in this article.
3. Disconnect the block heater electrical connector.
4. Loosen the block heater retaining screw and remove the block heater. To install, tighten to 2 Nm (18 lb-in).
5. To install, reverse the removal procedure. Route the block heater power cable away from hot or rotating components, or damage to the cable can occur.

Scheme 8

1. Remove the intake manifold. For additional information, refer to «ENGINE - 5.4L (3V)»(/lincoln/mark-lt/i-2005-2009/remont/mechanical/#engine-54l-3v-f-150-mark-lt) article.
2. Remove the bolts and the coolant crossover manifold assembly. To install, tighten to 10 Nm (89 lb-in).
3. Remove and inspect the gaskets. Install new gaskets if necessary.
4. To install, reverse the removal procedure.

Thermostat - 4.2L

Material

Scheme 9

REMOVAL

1. Drain the cooling system. For additional information, refer to «Cooling System Draining, Filling and Bleeding»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt__cooling-system-draining-filling-and-bleeding) in this article.
2. Release the clamp and disconnect the upper radiator hose from the thermostat housing.
3. Remove the bolts and the thermostat housing.
4. Remove the gasket and the thermostat.

INSTALLATION

1. Clean the gasket mating surfaces with a plastic scraper and metal surface prep. Follow the directions on the packaging.
2. Install the thermostat in the thermostat housing and rotate the thermostat either clockwise or counterclockwise to engage the cam on the thermostat securely. The thermostat vent must be located either at the 11 o'clock or 1 o'clock position. Thermostat vent shown at 11 o'clock. Thermostat vent shown at 1 o'clock.
3. Position a new gasket and the thermostat housing and install the bolts. Tighten the bolts in 2 stages. Stage 1: Tighten to 8 N.m (71 lb-in). Stage 2: Tighten an additional 60 degrees.
4. Connect the upper radiator hose and position the clamp.
5. Fill and bleed the cooling system. For additional information, refer to «Cooling System Draining, Filling and Bleeding»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt__cooling-system-draining-filling-and-bleeding) in this article.

Scheme 10

1. Drain the engine cooling system. For additional information, refer to «Cooling System Draining, Filling and Bleeding»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt__cooling-system-draining-filling-and-bleeding) in this article.
2. Remove the air cleaner outlet pipe. For additional information, refer to «INTAKE AIR DISTRIBUTION AND FILTERING»(/lincoln/mark-lt/i-2005-2009/remont/removal-installation/#intake-air-distribution-system-and-filtering-system-f-150-mark-lt) article.
3. If servicing the thermostat housing, release the upper radiator hose clamp and disconnect the radiator hose from the thermostat housing.
4. Remove the power steering upper bracket-to-thermostat housing bolt. To install, tighten to 11 Nm (8 lb-ft).
5. Remove the power steering upper bracket-to-intermediate bracket bolts and the power steering upper bracket. To install, tighten to 17 Nm (13 lb-ft).
6. Remove the bolts and position the thermostat housing aside. To install, tighten to 25 Nm (18 lb-ft).
7. Remove the thermostat and the O-ring seal. Discard the O-ring seal.
8. To install, reverse the removal procedure. Install a new O-ring seal and lubricate with clean engine coolant.
9. Fill and bleed the cooling system. For additional information, refer to «Cooling System Draining, Filling and Bleeding»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt__cooling-system-draining-filling-and-bleeding) in this article.

Thermostat - 5.4L (3V)

Material

Scheme 11

1. Drain the engine cooling system. For additional information, refer to «Cooling System Draining, Filling and Bleeding»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt__cooling-system-draining-filling-and-bleeding) in this article.
2. Remove the air cleaner intake pipe. For additional information, refer to «INTAKE AIR DISTRIBUTION AND FILTERING»(/lincoln/mark-lt/i-2005-2009/remont/removal-installation/#intake-air-distribution-system-and-filtering-system-f-150-mark-lt) article.
3. If servicing the thermostat housing, release the clamp and disconnect the upper radiator hose from the thermostat housing.
4. Remove the bolts and the thermostat housing. To install, tighten to 10 Nm (89 lb-in).
5. Remove the thermostat and the O-ring seal. Discard the O-ring seal.
6. To install, reverse the removal procedure. Install a new O-ring seal and lubricate it with clean engine coolant.
7. Fill and bleed the cooling system. For additional information, refer to «Cooling System Draining, Filling and Bleeding»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt__cooling-system-draining-filling-and-bleeding) in this article.

Coolant Pump - 4.2L

Material

Scheme 12

Scheme 13

1. Drain the cooling system. For additional information, refer to «Cooling System Draining, Filling and Bleeding»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt__cooling-system-draining-filling-and-bleeding) in this article.
2. Remove the engine cooling fan and the fan shroud. For additional information, refer to «Cooling Fan - Blade, Clutch and Shroud»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt__cooling-fan-blade-clutch-and) in this article.
3. Loosen the 4 coolant pump pulley bolts. To install, tighten to 25 Nm (18 lb-ft).
4. Remove the drive belt. For additional information, refer to «ACCESSORY DRIVE»(/lincoln/mark-lt/i-2005-2009/remont/accessory-drive-belts/#accessory-drive-system-f-150-mark-lt) article.
5. Remove the bolts and the coolant pump pulley.
6. Remove the bolt and disconnect the heater outlet tube assembly from the coolant pump. Clean and inspect the O-ring seal. Install a new O-ring seal if necessary. To install, lubricate the O-ring seal with clean engine coolant. To install, tighten to 10 Nm (89 lb-in).
7. Remove the nuts for the A/C compressor mounting bracket support. To install, tighten to 25 Nm (18 lb-ft).
8. Remove the A/C compressor mounting bracket support upper bolt. Loosen the A/C compressor mounting bracket support lower bolt. Position the bracket and bolt forward until they contact the power steering pump pulley. Position the A/C compressor mounting bracket aside. To install, tighten to 48 Nm (35 lb-ft).
9. Release the clamp and disconnect the lower radiator hose.
10. Remove the fasteners and the coolant pump. To install, tighten to 28 Nm (21 lb-ft).
11. Remove and discard the coolant pump gasket.
12. Clean the coolant pump gasket mating surfaces with a plastic scraper and metal surface prep. Follow the directions on the packaging.
13. To install, reverse the removal procedure.

Coolant Pump - 4.6L (2V)

Material

Scheme 14

1. Drain the engine cooling system. For additional information, refer to «Cooling System Draining, Filling and Bleeding»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt__cooling-system-draining-filling-and-bleeding) in this article.
2. Remove the cooling fan. For additional information, refer to «Cooling Fan - Blade, Clutch and Shroud»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt__cooling-fan-blade-clutch-and) in this article.
3. Loosen the 4 coolant pump pulley bolts. To install, tighten to 25 Nm (18 lb-ft).
4. Remove the accessory drive belt. For additional information, refer to «ACCESSORY DRIVE»(/lincoln/mark-lt/i-2005-2009/remont/accessory-drive-belts/#accessory-drive-system-f-150-mark-lt) article.
5. Remove the bolts and the coolant pump pulley.
6. Remove the bolts and the coolant pump. To install, tighten to 25 Nm (18 lb-ft).
7. Remove and discard the O-ring seal.
8. Clean the O-ring seal mating surface with metal surface prep. Follow the directions on the packaging.
9. To install, reverse the removal procedure. Install a new O-ring seal and lubricate it with clean engine coolant.

Coolant Pump - 5.4L (3V)

Material

Scheme 15

1. Drain the engine cooling system. For additional information, refer to «Cooling System Draining, Filling and Bleeding»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt__cooling-system-draining-filling-and-bleeding) in this article.
2. Remove the cooling fan. For additional information, refer to «Cooling Fan - Blade, Clutch and Shroud»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt__cooling-fan-blade-clutch-and) in this article.
3. Loosen the 4 coolant pump pulley bolts. To install, tighten to 25 Nm (18 lb-ft).
4. Remove the accessory drive belt. For additional information, refer to «ACCESSORY DRIVE»(/lincoln/mark-lt/i-2005-2009/remont/accessory-drive-belts/#accessory-drive-system-f-150-mark-lt) article.
5. Remove the bolts and the coolant pump pulley.
6. Remove the bolts and the coolant pump. To install, tighten to 25 Nm (18 lb-ft).
7. Remove and discard the O-ring seal.
8. Clean the O-ring seal mating surface with metal surface prep. Follow the directions on the packaging.
9. To install, reverse the removal procedure. Install a new O-ring seal and lubricate it with clean engine coolant.

Radiator

Special Tools Illustration Tool Name Tool Number Disconnect Tool, Transmission Cooler Line 307-441

Scheme 16

1. Drain the engine cooling system. For additional information, refer to «Cooling System Draining, Filling and Bleeding»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt__cooling-system-draining-filling-and-bleeding) in this article.
2. Remove the cooling fan and shroud. For additional information, refer to «Cooling Fan - Blade, Clutch and Shroud»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt__cooling-fan-blade-clutch-and) in this article.
3. Release the clamp and disconnect the upper radiator hose.
4. Release the clamp and disconnect the upper degas bottle hose.
5. Release the clamp and disconnect the lower radiator hose.
6. Using the special tool, disconnect the transmission cooler tubes.
7. Remove the bolts, the radiator support brackets and the upper radiator insulators To install, tighten to 30 N.m (22 lb-ft).
8. Remove the radiator.
9. Remove the lower radiator insulators.
10. To install, reverse the removal procedure.

Cooling Fan - Blade, Clutch and Shroud

Special Tools Illustration Tool Name Tool Number Holding Wrench, Fan Pulley 303-239 (T84T-6312-C) Wrench, Fan Clutch Nut 303-214 (T83T-6312-B) Wrench, Fan Clutch Nut 303-240 (T84T-6312-D)

Scheme 17

Scheme 18

Scheme 19

All vehicles

1. Remove the pin-type retainers and the radiator appearance cover.

Vehicles equipped with a 4.2L or 4.6L (2V) engine

1. Remove the air cleaner outlet pipe. For additional information, refer to «INTAKE AIR DISTRIBUTION AND FILTERING»(/lincoln/mark-lt/i-2005-2009/remont/removal-installation/#intake-air-distribution-system-and-filtering-system-f-150-mark-lt) article.

Vehicles equipped with a 4.6L (2V) or 5.4L (3V) engine

1. Detach the battery cable harness retainer from the radiator shroud.
2. Disconnect the electronic cooling fan clutch electrical connector.
3. Remove the nut and detach the electronic cooling fan clutch wiring harness from the stud bolt. To install, tighten to 13 Nm (10 lb-ft).

Vehicles equipped with a 5.4L (3V) engine

1. Remove the air cleaner intake pipe. For additional information, refer to «INTAKE AIR DISTRIBUTION AND FILTERING»(/lincoln/mark-lt/i-2005-2009/remont/removal-installation/#intake-air-distribution-system-and-filtering-system-f-150-mark-lt) article.
2. Remove the bolts and the air cleaner intake pipe support bracket. To install, tighten to 10 Nm (89 lb-in).

Vehicles equipped with a 4.2L engine

1. Using the special tools, remove the cooling fan assembly and position it in the fan shroud. To install, tighten to 55 Nm (41 lb-ft).

1. Using the special tools, remove the cooling fan assembly and position it in the fan shroud. To install, tighten to 55 Nm (41 lb-ft).

Scheme 20

1. Remove the bolts and the cooling fan shroud and cooling fan. To install, tighten to 6 Nm (53 lb-in).
2. If servicing the cooling fan or cooling fan clutch, refer to «Cooling Fan and Cooling Fan Clutch»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt) in this article.
3. To install, reverse the removal procedure.

Scheme 21

1. Release the pressure in the cooling system by slowly turning the pressure relief cap one half turn counterclockwise. When the pressure is released, remove the pressure relief cap.
2. Using hose clamp pliers, clamp the coolant return hose.
3. Using a suitable suction device, siphon the coolant from the degas bottle.
4. Release the clamp and disconnect the degas bottle upper hose.
5. Release the clamp and disconnect the coolant return hose.
6. Remove the bolts and the degas bottle. To install, tighten to 9 Nm (80 lb-in).
7. To install, reverse the removal procedure.
8. Fill the degas bottle. Refer to «Cooling System Draining, Filling and Bleeding»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt__cooling-system-draining-filling-and-bleeding) in this article for the recommended coolant mixture and fill level.

Scheme 22

Scheme 23

1. Remove the cooling fan. For additional information, refer to «Cooling Fan - Blade, Clutch and Shroud»(/lincoln/mark-lt/i-2005-2009/remont/cooling-system-mechanical/#engine-cooling-system-f-150-mark-lt__cooling-fan-blade-clutch-and) in this article.

4.2L engines

1. Remove the 4 bolts and separate the fan and the fan clutch. To install, tighten to 17 Nm (13 lb-ft).

4.6L (2V) and 5.4L (3V) engines

1. Remove the 4 bolts and separate the fan and the fan clutch. To install, tighten to 7 Nm (62 lb-in).

1. To install, reverse the removal procedure.

See also:
• ENGINE SYSTEM - GENERAL INFORMATION
• MODULE COMMUNICATIONS NETWORK
• MULTIFUNCTION ELECTRONIC MODULES
• INTRODUCTION - GASOLINE ENGINES
• INSTRUMENT CLUSTER
• CLIMATE CONTROL SYSTEM - GENERAL INFORMATION AND DIAGNOSTICS
• JACKING AND LIFTING
• ENGINE - 5.4L (3V)
• INTAKE AIR DISTRIBUTION AND FILTERING
• ACCESSORY DRIVE
• Engine Cooling
• Pinpoint Test B
• Pinpoint Test C
• Pinpoint Test A
• Cooling System Flushing
• Cooling System Draining, Filling and Bleeding
• Thermostat - 4.2L
• Thermostat - 5.4L (3V)
• Cooling Fan - Blade, Clutch and Shroud