Ford F150 Pickup. Instruction — part 1611

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Coolant leaks.

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Water/anti-freeze mixture.

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Radiator condition.

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Collapsed/restricted radiator hoses.

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Radiator pressure cap.

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Overflow system.

Miscellaneous Component Or System Checks

Check the following:

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On Mustang and ZX2, if cooling fan(s) do not operate at any speed, go to TEST X: CONSTANT
CONTROL RELAY MODULE , step 40) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG,
FLEX-FUEL & GASOLINE article.

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On Crown Victoria, Grand Marquis, LS, Thunderbird and Town Car, if hydraulic cooling fan(s) do not
operate at any speed, go to step TEST KN: VARIABLE SPEED ELECTRIC COOLING FAN , step
15) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

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On Expedition, Navigator and Pickups with Visctronic cooling fan clutch, if cooling fan does not operate,
go to TEST KG: VISCTRONIC DRIVE FAN CLUTCH , step 4) under SYSTEM TESTS in SELF-
DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

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On all others, if cooling fan(s) do not operate at all speeds, go to TEST KF: FAN CONTROL RELAY ,
step 25) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

If directed back here from another article for further cooling fan diagnosis, check engine cooling system for
mechanical faults. See COOLING SYSTEM TROUBLE SHOOTING under ENGINE MECHANICAL in
TROUBLE SHOOTING - BASIC PROCEDURES article in GENERAL INFORMATION.

ELECTRIC, HYDRAULIC OR VISCTRONIC COOLING FAN(S) ALWAYS ON

Miscellaneous Component Or System Checks

Ensure all accessories, A/C and defroster are off, and engine is cooled (so cooling fan would not normally come
on). Start engine. Check electric or hydraulic cooling fan. If cooling fan runs continuously, check cooling fan
ACPSW or ACP circuits. Perform the following:

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On ZX2 and Mustang 4.6L, go to TEST X: CONSTANT CONTROL RELAY MODULE , step 80)
under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

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On Mustang 3.8L, go to TEST X: CONSTANT CONTROL RELAY MODULE , step 82) under
SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

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On Windstar, go to TEST KF: FAN CONTROL RELAY , step 63) under SYSTEM TESTS in SELF-
DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

NOTE:

This is intended to diagnose an electric, hydraulic or Visctronic cooling fan that
is always on with a "cool" engine, and A/C and defroster off.

2003 Ford Pickup F150

2003 ENGINE PERFORMANCE Trouble Shooting - No Codes - CNG, Flex-Fuel & Gasoline

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On Crown Victoria, Grand Marquis, LS, Thunderbird and Town Car, verify results of quick test. See
QUICK TEST in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. Visually inspect
cooling fan for concerns.

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On Pickups with Visctronic cooling fan clutch, go to TEST KG: VISCTRONIC DRIVE FAN
CLUTCH , step 10) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL &
GASOLINE article.

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On all other models, go to TEST KF: FAN CONTROL RELAY , step 60) under SYSTEM TESTS in
SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

If directed back here from another article for further cooling fan diagnosis, check engine cooling system for
mechanical faults. Check engine cooling system for mechanical faults. See COOLING SYSTEM TROUBLE
SHOOTING under ENGINE MECHANICAL in TROUBLE SHOOTING - BASIC PROCEDURES article in
GENERAL INFORMATION.

EXHAUST SMOKE

Black Smoke (Rich Mixture)

Check the following:

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Check fuel delivery system. Go to TEST HB: NATURAL GAS FUEL DELIVERY SYSTEM , step 1)
(Natural Gas models), or go to TEST HC: GASOLINE FUEL DELIVERY SYSTEM , step 1) (all
others) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

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Check secondary ignition system. Go to TEST JB: SECONDARY IGNITION , step 1) under SYSTEM
TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

Blue Smoke (Burning Oil)

Check the following:

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Check PCV system. For Aviator and Mustang 4.6L, go to TEST HG: PCV SYSTEM , step 1) under
SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article. For all others,
go to TEST HG: PCV SYSTEM , step 4) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG,
FLEX-FUEL & GASOLINE article.

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Check engine mechanical condition. Check valve guides, valve stems, valve seals, oil drain passages in
cylinder heads (Blue smoke on start-up), piston rings and cylinder bores, and repair as necessary. See
appropriate article in ENGINES.

White Smoke (Water In Combustion)

Check for cylinder head gasket leaks, intake manifold gasket leaks, cracked engine block or cylinder head(s)
and repair as necessary. See appropriate article in ENGINES.

NOTE:

Black smoke may indicate a rich fuel mixture, blue smoke may indicate engine
burning oil, and white smoke may indicate water in combustion chamber.

2003 Ford Pickup F150

2003 ENGINE PERFORMANCE Trouble Shooting - No Codes - CNG, Flex-Fuel & Gasoline

FUEL ODOR

Preliminary Checks

Check fuel tank(s), hoses, connectors and lines for leaks.

Symptom Checks

Check the following:

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On Natural Gas models, check fuel delivery system for leaks. Go to TEST HB: NATURAL GAS FUEL
DELIVERY SYSTEM , step 16) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-
FUEL & GASOLINE article.

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On all models, check EVAP emission system for leaks. See EXCESSIVE FUEL ODOR under
SYSTEM TESTS (EVAPORATIVE EMISSIONS) in SYSTEM & COMPONENT TESTING -
GASOLINE article.

ENGINE NOISE

Symptom Checks

A snap noise may be due to secondary ignition arcing. On Coil On Plug (COP) models, check condition of
spark plug boots. On all other models, check secondary ignition system. Go to TEST JB: SECONDARY
IGNITION , step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE
article.

CLIMATE CONTROL (LACK OF A/C COOLING, A/C ALWAYS ON OR A/C INOPERATIVE)

Lack Of A/C Cooling Or A/C Inoperative (Mustang)

Go to TEST X: CONSTANT CONTROL RELAY MODULE , step 98) under SYSTEM TESTS in SELF-
DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

A/C Always On (Mustang)

Go to TEST X: CONSTANT CONTROL RELAY MODULE , step 140) under SYSTEM TESTS in SELF
DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

NOTE:

Attempt to identify source of noise. If noise is from another source other than
secondary ignition system, go to SYMPTOM DIAGNOSIS (for noise such as
spark knock), or for other engine mechanical noise, See GASOLINE ENGINE -
MECHANICAL TROUBLE SHOOTING under ENGINE MECHANICAL in TROUBLE
SHOOTING - BASIC PROCEDURES article in GENERAL INFORMATION.

NOTE:

For additional A/C system information, see appropriate MANUAL or
AUTOMATIC A/C-HEATER SYSTEMS article in AIR CONDITIONING & HEATING.

2003 Ford Pickup F150

2003 ENGINE PERFORMANCE Trouble Shooting - No Codes - CNG, Flex-Fuel & Gasoline

A/C Does Not Turn Off During WOT (Mustang)

Go to TEST X: CONSTANT CONTROL RELAY MODULE , step 130) under SYSTEM TESTS in SELF
DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

A/C System Concerns (All Others)

Check A/C system. See appropriate MANUAL or AUTOMATIC A/C-HEATER SYSTEMS article in AIR
CONDITIONING & HEATING for diagnosis and repair.

WACF PID Displays YES

If directed here from a MANUAL or AUTOMATIC A/C-HEATER SYSTEMS article with Parameter
Identification (PID) WACF displaying YES (fault present), perform diagnostics for KOEO DTC P1460. For
Mustang and ZX2, see TEST X: CONSTANT CONTROL RELAY MODULE , step 105) , for all others, see
TEST KM: A/C CLUTCH RELAY & A/C CIRCUITS , step 1) in SELF-DIAGNOSTICS - CNG, FLEX-
FUEL & GASOLINE article.

EXHAUST ODOR (SULFUR SMELL)

Preliminary Checks

Ensure odor is from exhaust and not from an under hood odor, such as battery acid. Ensure that there are no
other driveability or exhaust smoke symptoms. See appropriate symptom under SYMPTOM DIAGNOSIS
under SYMPTOMS.

Symptom Checks

Check the following items:

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Check fuel delivery system. Go to TEST HB: NATURAL GAS FUEL DELIVERY SYSTEM , step 1)
(Natural Gas models), or go to TEST HC: GASOLINE FUEL DELIVERY SYSTEM , step 1) (all
others) under SYSTEM TESTS in SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE article.

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Check EVAP emission system for leaks. See EVAPORATIVE EMISSION SYSTEM TESTS in
SYSTEM & COMPONENT TESTING - GASOLINE article.

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Sulfur content can vary in different fuels. Try a different fuel source.

INTERMITTENTS

INTERMITTENT PROBLEM DIAGNOSIS

Intermittent fault testing requires duplicating circuit or component failure to identify the problem. These

NOTE:

On vehicles with a NEW catalytic converter or vehicles with 5000-10,000 miles,
sulfur smell may be normal due to the highly active state of catalytic converter.
Replacing catalytic converter on these vehicles may worsen symptom.

2003 Ford Pickup F150

2003 ENGINE PERFORMANCE Trouble Shooting - No Codes - CNG, Flex-Fuel & Gasoline