Engine Cooling System: Other Ford Expedition II

Thermostat

A new water thermostat should be installed only after the following electrical and mechanical tests have been carried out.

Thermostat-Electrical Test

Note. The electrical thermostat test is most accurate if carried out indoors at less than 37.8°C (100°F) ambient air. This test may be carried out with or without the hood open and with the engine warm or cold.

1. Check the engine coolant level. Fill as needed.
2. With the key OFF, remove the cylinder head temperature (CHT) sensor harness connector and attach CHT Sensor "T" Cable as a jumper between the powertrain control module (PCM) and the CHT Sensor. Attach 73 Digital Multimeter to the CHT Sensor "T" Cable. Voltage values (0 to 5 V) can now be monitored while the sensor retains its connection to the wiring harness. Use a scan tool to monitor the CHT sensor voltage.
3. Place the automatic transmission in PARK (P).
4. Start the engine and allow to idle throughout this test. Allow the engine to run for two minutes, then record the CHT voltage. Record the CHT voltage every 60 seconds. When the ECT voltage trend changes direction or only changes slightly (0.03 volt or less) from the previous reading, record this as the thermostat opening voltage. Use the voltage and corresponding coolant temperature chart listed below. COOLANT TEMPERATURE Coolant Temperature °C (°F) CHT Min (Volts) CHT Nom (Volts) CHT Max (Volts) 0 (32) 4.7714 4.8032 4.8723 25 (77) 4.3428 4.4148 4.4727 50 (122) 3.5354 3.6495 3.7473 80 (176) 2.3049 2.4201 2.5260 110 (230) 1.3021 1.3808 1.4562 140 (284) 0.6960 0.7414 0.7857 170 (338) 0.3784 0.4024 0.4261
5. If the thermostat opening voltage is greater than 0.75 volt and less than 82°C (180°F), install a new water thermostat.
6. If the thermostat opening voltage is less than 0.75 volt and greater than 82°C (180°F), the water thermostat is good and a new thermostat should not be installed. For additional information, refer to the «SYMPTOM CHART»(ref-209901-S39137369212005121200000) .

Thermostat- Mechanical Test

1. Remove the water thermostat.
2. Check the water thermostat for seating. Hold the water thermostat up to a lighted background. Leakage of light around the thermostat valve at room temperature indicates that a new water thermostat should be installed. Some water thermostats have a small leakage notch at one location on the perimeter of the thermostat valve, which is considered normal.
3. Immerse it in a boiling antifreeze and water mixture.
4. For additional information, refer to «SPECIFICATIONS»(ref-209901-S31132685302005121200000) for water thermostat opening temperature.

Heater Core Backflushing

MATERIAL SPECIFICATION

1. Partially drain the cooling system. For additional information, refer to «COOLING SYSTEM DRAINING, FILLING AND BLEEDING»(ref-209901-S18813989322005121200000) .
2. Use an appropriate cooling system flusher to backflush the heater core.
3. Fill the cooling system. For additional information, refer to «COOLING SYSTEM DRAINING, FILLING AND BLEEDING»(ref-209901-S18813989322005121200000) .

Material

MATERIAL SPECIFICATION

Scheme 30

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Scheme 32

1. Drain the engine cooling system. For additional information, refer to «COOLING SYSTEM DRAINING, FILLING AND BLEEDING»(ref-209901-S18813989322005121200000) .
2. Disconnect the (A) block heater wire extension (6B019) from the (B) block heater wiring (6B018) and remove.
3. Raise and support the vehicle. For additional information, refer to «JACKING & LIFTING»(ref-209881) .
4. Disconnect the (A) block heater wiring from the (B) block heater (6A051).
5. Remove the block heater. CAUTION: Do not loosen the screw more than necessary for removal. Loosen the screw. Twist and slide the block heater to release the retainer clip and remove. Discard the retainer clip.
6. To install, reverse the removal procedure.

Scheme 33

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Scheme 35

1. Partially drain the engine cooling system. For additional information, refer to «COOLING SYSTEM DRAINING, FILLING AND BLEEDING»(ref-209901-S18813989322005121200000) .
2. Disconnect the upper radiator hose from the water outlet adapter.
3. Remove the power steering reservoir upper mounting bracket.
4. Remove the bolts and remove the water outlet adapter.
5. Remove the water thermostat and the O-ring seal. Discard the O-ring seal.
6. To install, reverse the removal procedure.

Scheme 36

Scheme 37

1. Partially drain the engine cooling system. For additional information, refer to «COOLING SYSTEM DRAINING, FILLING AND BLEEDING»(ref-209901-S18813989322005121200000) .
2. Disconnect the upper radiator hose, the heater water inlet hose and the heated PCV inlet hose from the water outlet adapter.
3. Remove the water hose connection (8592).
4. To install, reverse the removal procedure.

MATERIAL SPECIFICATION

Scheme 38

Scheme 39

1. Drain the cooling system. For additional information, refer to «COOLING SYSTEM DRAINING, FILLING AND BLEEDING»(ref-209901-S18813989322005121200000) .
2. Remove the engine cooling fan and fan shroud. For additional information, refer to «COOLING FAN»(ref-209901-S31801808922005121200000) .
3. Remove the drive belt. For additional information, refer to «SPECIFICATIONS & DRIVE BELT ROUTING»(ref-165242) .
4. Remove the bolts in the sequence shown, and the water pump pulley.
5. Remove the bolts in the sequence shown, and the water pump.
6. Wipe the water pump mounting surface with a soft cloth if necessary.
7. To install, reverse the removal procedure.

Scheme 40

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Scheme 46

1. Drain the cooling system. For additional information, refer to «COOLING SYSTEM DRAINING, FILLING AND BLEEDING»(ref-209901-S18813989322005121200000) .
2. Remove the fan blade. For additional information, refer to «COOLING FAN»(ref-209901-S31801808922005121200000) .
3. Raise and support the vehicle. For additional information, refer to «JACKING & LIFTING»(ref-209881) .
4. Remove the splash shield.
5. Remove the pushpin securing the lower radiator hose to the radiator routing hook.
6. Disconnect the following: Lower radiator hose from the radiator. Lower radiator hose from the routing hook. Transmission tubes from the radiator.
7. Lower the vehicle.
8. Remove the front air deflector. Remove the screws. Remove the front air deflector.
9. Disconnect the degas bottle hose and the upper radiator hose.
10. Remove the radiator. Remove the bolts. Remove the radiator upper support brackets. Remove the radiator.
11. To install, reverse removal procedure.

Scheme 47

MATERIAL SPECIFICATION

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 without RADKITPLUS

1. Add the correct engine coolant mixture to the degas bottle.
2. Move the temperature blend selector to the full warm position, or for digital automatic temperature control (DATC) systems, select 32°C (90°F).
3. Run the engine until it reaches operating temperature.
4. Add the correct engine coolant mixture to the degas bottle until the coolant level is between the "COOLANT FILL LEVEL" marks.
5. Turn off the engine and allow the cooling system to cool.
6. Repeat Steps 1 through 5 until the degas bottle level is OK.

Bleeding without RADKITPLUS

1. Select maximum heater temperature and blower motor speed settings, or for digital temperature control (DATC) systems select 32°C (90°F). Position control to discharge air at A/C vents in the instrument panel (04320).
2. Start the engine and allow to idle. While the engine is idling, feel for hot air at A/C vents.
3. Start the engine and allow to idle until normal operating temperature is reached. 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.
4. Shut the engine off and allow it to cool.
5. Check the engine for coolant leaks.
6. Check the engine coolant level in the degas bottle and fill as necessary.