oil temperature FORD MUSTANG 2003 Owner's Manual

DESCRIPTION AND OPERATION
Engine Cooling
CAUTION: Vehicle cooling systems are filled with Motorcraft Premium Gold Engine
Coolant VC -7-A (in Oregon VC -7-B) or equivalent meeting Ford specification WSS- M97B51-A1
(yellow color). Always fill the cooling system with the same coolant that is present in the
system. Do not mix coolant types.
NOTE: The addition of Motorcraft Cooling System Stop Leak Pellets, VC- 6, darkens Motorcraft
Premium Gold Engine Coolant from yellow to golden tan.
The 4.6L cooling system components include the:
zblock heater
z engine coolant temperature (ECT) sensor
z fan blade, fan motor and fan shroud assembly
z radiator
z pressure relief cap
z radiator draincock
z coolant pump
z coolant thermostat
z oil filter adapter
z radiator overflow hose
z upper radiator hose
z lower radiator hose
The radiator overflow hose circulates the coolant.
The coolant thermostat:
zcontrols the engine coolant temperature.
z allows for quicker engine warm- up.
The degas bottle/coolant expansion tank:
zprovides a location for service fill.
z contains coolant expansion and system pressurization.
z provides air separation during operation.
z replenishes the engine coolant to the system.
The engine coolant flows:
zfrom the lower radiator hose to the coolant pump.
z from the coolant pump to the engine block and the cylinder heads.
SECTION 303-
03A: Engine Cooling 2003 Mustang Workshop Manual Klj . 1 ba
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The 3.8L cooling system components include the:
zblock heater
z engine coolant temperature (ECT) sensor
z fan blade, fan motor and fan shroud assembly
z radiator
z radiator cap
z radiator draincock
z coolant pump
z coolant thermostat
z oil filter adapter
z radiator overflow hose
z coolant expansion tank
z upper radiator hose
z lower radiator hose
The fan blade draws air through the radiator to help cool the engine coolant.
The fan motor:
zoperates only when the ignition switch is in the RUN position.
z will not operate with the switch in the OFF position.
The engine coolant:
zflows through the radiator tubes and is cooled by passing air over the cooling fins.
z is then circulated from the radiator outlet tank through the coolant pump and into the cylinder
block to complete the circuit.
A closed coolant thermostat returns the engine coolant to the coolant pump. An open coolant
thermostat allows the engine coolant to flow to the radiator.
CAUTION: 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 degas bottle (4.6L) or coolant expansion tank (3.8L).
When adding engine coolant, use a 50/50 mixture of engine coolant and deionized water.
To maintain the integrity of the coolant and the cooling system:
zNOTE: The addition of Motorcraft Cooling System Stop Leak Pellets, VC-6, darkens Motorcraft
Premium Gold Engine Coolant from yellow to golden tan.
Add Motorcraft Premium Gold Engine Coolant VC-7- A (in Oregon VC-7-B) or equivalent
meeting Ford specification WSS- M97B51-A1 (yellow color). Use the same coolant that is
present in the cooling system. Do not mix coolant types.
z Do not add/mix orange-colored Motorcraft Speciality Orange Engine Coolant VC- 2 or equivalent Klj . 2 ba
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3. If the inspection reveals an obvious concern that can be readily identified, repair as necessary.
4.
CAUTION: Some vehicle cooling systems are filled with Motorcraft Premium Gold
Engine Coolant VC -7-A (in Oregon VC -7-B) or equivalent meeting Ford specification
WSS- M97B51- A1 (yellow color). Always fill the cooling system with the same coolant that
is present in the system. Do not mix coolant types.
NOTE: The addition of Motorcraft Cooling System Stop Leak Pellets, VC-6, darkens Motorcraft
Premium Gold Engine Coolant from yellow to golden tan.
Inspect the coolant condition. 1. Inspect the coolant color.
„If Motorcraft Premium Gold Engine Coolant (yellow color) VC-7- A (in Oregon VC-
7- B) or equivalent meeting Ford specification WSS-M97B51- A1 has a clear or
pale yellow color, this indicates higher water content than required.
„ Dark brown can indicate unauthorized stop leak may have been used. Use
Motorcraft Cooling System Stop Leak Pellets VC- 6 or equivalent meeting Ford
specification ESE-M99B37- 5 except as noted in ES-F6SE-19A511- AA only.
„ 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 water and engine
coolant.
„ An iridescent sheen on top of the coolant can indicate a trace of oil is entering the
system. For additional information on engine diagnosis, refer to Section 303 - 00 .
„ A milky brown color may indicate that either engine oil or transmission fluid is
entering the cooling system. If transmission fluid is suspected, the cause may be a
leaky radiator. Pressure test the cooling system. For additional information, refer
to component tests in this section. If engine oil is suspected the cause of the leak
may be internal to the engine. For additional information, refer to Section 303 - 00 .
2. If the engine coolant appearance is acceptable, test the engine coolant freezing point
range with the battery and anti- freeze tester. The freezing point should be in the range -
40°C to - 20°C (-50°F to - 10°F). If the vehicle is driven in cold climates less than - 32°C (-
34°F), it may be necessary to increase the coolant concentration to get adequate freeze
protection.
„Maximum coolant concentration is 60% coolant/40% water.
„ Minimum coolant concentration is 40% coolant/60% water. 3. Adjust coolant range and level, if necessary: Visual Inspection Chart
Mechanical
z
Leaks
z Hoses
z Hose clamps
z Water gasket
z Head gaskets
z Intake manifold gasket
z Coolant pump
z Radiator
z Degas bottle/coolant expansion tank
z Heater core
z Fan/fan clutch
z Engine coolant temperature sensor (4.6L)
z Cylinder head temperature sensor (3.8L)
z Circuitry Klj . 2 ba
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3.
NOTE: Running this test with the vehicle in gear or with the A/C compressor clutch engaged
(running) will cause incorrect diagnosis.
Place the transmission in PARK (P) or NEUTRAL (N).
4. Start the engine and allow the engine to idle throughout this test. Allow the engine to run for 2 minutes, then record the ECT (4.6L) or CHT (3.8L) voltage. Record the ECT (4.6L) or CHT
(3.8L) voltage every 60 seconds. When the ECT (4.6L) or CHT (3.8L) voltage trend changes
direction or only changes slightly (0.03 volts or less) from the previous reading, record this as
the thermostat opening voltage. Use the voltage and corresponding coolant temperature chart
listed below for 4.6L engines only.
5. If the thermostat opening voltage is greater than 0.75 volts and less than 82°C (180°F), install a new water thermostat.
6. If the thermostat opening voltage is less than 0.75 volts and greater than 82°C (180°F), the water thermostat is good and a new water thermostat should not be installed. GO to Symptom Chart for further instructions.
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 the water thermostat in a boiling coolant and water mixture.
4. See the General Specifications chart for water thermostat opening temperatures.
Radiator Leak Test, Removed From the Vehicle CAUTION: 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. Coolant Temperature °C (°F) ECT (Volts)
22 (71) 3.00
43 (109) 2.01
71 (159) 1.01
82 (180) 0.75
91 (195) 0.059
97 (206) 0.050
105 (221) 0.040 Klj . 9 ba
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"COOLANT FILL LEVEL" marks and replace the pressure cap.
7. Select the maximum cool temperature setting.
8. Run the engine until it reaches operating temperature.
9. CAUTION: If the engine coolant temperature gauge does not move, the engine
coolant level in the engine is low and must be filled. Stop the engine, allow it to cool and
fill the cooling system.
Add the correct engine coolant mixture to the degas bottle until the coolant level is between the
"COOLANT FILL LEVEL" marks.
10. Repeat the two previous steps until the engine coolant mixture is between the "COOLANT FILL LEVEL" marks on the degas bottle. Turn off the engine and allow it to cool.
11. Check the freeze protection of the engine coolant mixture with the Battery/Anti- freeze Tester
014- R1060 or equivalent. Adjust freezing point range if necessary.
Filling — Cobra
CAUTION: Vehicle cooling systems are filled with Motorcraft Premium Gold Engine
Coolant VC -7-A (in Oregon VC -7-B) or equivalent meeting Ford specification WSS- M97B51-A1
(yellow color). Always fill the cooling system with the same coolant that is present in the
system. Do not mix coolant types.
CAUTION: 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 degas bottle.
When adding engine coolant, use a 50/50 mixture of engine coolant and deionized water.
To maintain the integrity of the coolant and the cooling system:
zAdd Motorcraft Premium Gold Engine Coolant VC -7-A (in Oregon VC -7-B) or equivalent
meeting Ford specification WSS- M97B51-A1 (yellow color). Use the same coolant that
was drained from the cooling system. Do not mix coolant types.
z Do not add/mix orange- colored Motorcraft Speciality Orange Engine Coolant VC- 2 or
equivalent meeting Ford specification WSS- M97B44-D. Mixing coolants may degrade the
coolant's corrosion protection.
z 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.
z Do not mix with recycled coolant unless it meets the requirements of Ford specification
WSS- M97B51- A1. Not all coolant recycling processes meet these Ford specifications.
Use of such coolants can harm the engine and cooling system components.
NOTE: The addition of Motorcraft Cooling System Stop Leak Pellets, VC- 6, darkens Motorcraft
Premium Gold Engine Coolant from yellow to golden tan.
1. Check all hose clamps for correct tightness. Make sure the radiator draincock is closed.
2. Place the heater temperature selector in maximum cool position. Klj . 4 ba
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3. Remove the pressure cap from the cooling system reservoir and the fill plug from the engine
crossover tube.
4. CAUTION: Do not fill the cooling system through the reservoir only. Coolant will not
enter the engine. Only the reservoir and the radiator will be filled and engine overheating
will occur.
Add coolant into the fill neck on the engine crossover tube until coolant reaches the top of the fill
neck on the cooling system reservoir.
5. Install the cooling system pressure cap on the reservoir.
6. Continue to fill the cooling system at the engine crossover fill neck until full.
7. Install the engine crossover tube fill plug.
8. WARNING: To avoid the possibility of personal injury or damage to the vehicle, do
not operate the engine with the hood open until the fan has been first examined for
possible cracks and separation.
CAUTION: If the engine temperature gauge does not move, coolant level is low in
the engine and must be filled. Stop the engine, allow to cool, and fill the cooling system
as outlined.
Run the engine until the thermostat opens (coolant flowing through the radiator lower hose
becomes hot).
9. Stop the engine and allow to cool.
10. Add coolant to the engine crossover tube fill neck until the cooling system is full.
11. Install the fill plug.
12. Repeat the fill procedure if necessary.
Filling — Mach I
CAUTION: Vehicle cooling systems are filled with Motorcraft Premium Gold Engine
Coolant VC -7-A (in Oregon VC -7-B) or equivalent meeting Ford specification WSS- M97B51-A1
(yellow color). Always fill the cooling system with the same coolant that is present in the
system. Do not mix coolant types.
CAUTION: 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 degas bottle.
When adding engine coolant, use a 50/50 mixture of engine coolant and deionized water.
To maintain the integrity of the coolant and the cooling system:
zAdd Motorcraft Premium Gold Engine Coolant VC -7-A (in Oregon VC -7-B) or equivalent
meeting Ford specification WSS- M97B51-A1 (yellow color). Use the same coolant that Klj . 5 ba
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10. Disconnect the cylinder head temperature (CHT) sensor electrical connector on the back of the
left cylinder head.
11. Disconnect the engine oil pressure sender electrical connector.
12. Disconnect the fuel pressure sensor electrical connector. 13. Disconnect the LH heated oxygen sensor (HO2S) electrical connector. Klj . 3 ba
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Item Part
Number Description
1 — Engine control sensor wiring —
42 pin electrical
connector 2 — RH heated oxygen sensor (HO2S) electrical
connector
3 — LH heated oxygen sensor (HO2S) electrical
connector
4 — Ground wire electrical connector
5 — LH ignition coil electrical connectors
6 — Fuel pressure sensor electrical connector
7 — Fuel temperature sensor electrical connector
8 — Power distribution box battery feed electrical wire
9 — 2 pin electrical connector
10 — 4 pin electrical connector
11 — Camshaft position sensor (CMP) electrical
connector Klj . 2 ba
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12 — Coolant reservoir bottle electrical connector
13 — Radio ignition interference capacitor electrical
connector
14 — Fuel injector electrical connectors
15 — Exhaust vacuum regulator (EVR) electrical
connector
16 — Differential pressure feedback EGR electrical
connector
17 — RH ignition coil electrical connectors
18 — Ignition coil electrical connectors
19 — Throttle position (TP) sensor electrical connector
20 — Idle air control (IAC) solenoid electrical connector
21 — Voltage regulator electrical connector
22 — Engine coolant temperature (ECT) electrical
connector
23 — Generator battery electrical connector
24 — Radio ignition interference capacitor electrical
connector
25 — Crankshaft position (CKP) sensor electrical
connector
26 — Air conditioning compressor clutch electrical
connector
27 — 16 pin electrical connector Klj . 3 ba
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6. Disconnect the following connections:
zFour ignition coils
z Four fuel injectors
z Positive crankcase ventilation (PCV) hose from valve cover.
7. Disconnect the following connectors: zRH radio ignition interference capacitor
z Engine coolant temperature (ECT) sensor 8. Disconnect the 16 pin connector Klj . 2 ba
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