Engine Cooling: Diagnosis Lincoln Aviator I

Inspection and Verification

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

Scheme 4

1. Verify the customer's concern by operating the engine to duplicate the condition.
2. Inspect to determine if any of the following mechanical or electrical concerns apply.
3. If the inspection reveals an obvious concern that can be readily identified, repair it as necessary.
4. Inspect the coolant condition. Inspect the coolant color. If Motorcraft Premium Engine Coolant VC-4-A (in Canada CXC-10, in Oregon VC-5) or equivalent meeting Ford specification ESE-M97B44-A has a clear, light green or blue color, this indicates a higher water content than required. If Motorcraft Premium Gold Engine Coolant 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 a higher water content than required. Dark brown could indicate unauthorized stop leak may have been used. Use Motorcraft Cooling System Stop Leak Pellets VC-6 or equivalent meeting Ford specification ESE-M99B37-B5 except as noted in ES-F65E-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 Premium Engine Coolant or Premium Gold Engine Coolant. The addition of Cooling System Stop Leak Pellets VC-6, darkens Motorcraft Premium Gold Engine Coolant from yellow to golden tan. An iridescent sheen on top of the coolant could indicate a trace of oil is entering the system. For additional information on engine diagnosis, refer to ENGINE SYSTEM - GENERAL INFORMATION . A milky brown color may indicate that engine oil is entering the cooling system. If engine oil is suspected, the cause of the leak may be internal to the engine. For additional information on engine diagnosis, refer to ENGINE SYSTEM - GENERAL INFORMATION . If the engine coolant appearance is acceptable, test the engine coolant freezing point with a Battery/Anti-Freeze Tester. The freezing point should be in the range of -50° F to -10° F. If the vehicle is driven in cold climates less than -34° F, it may be necessary to increase the coolant concentration to get adequate freeze protection. Maximum coolant concentration is 60/40 percent. Minimum coolant concentration is 40/60 percent. Adjust coolant range and level if necessary. If coolant is low, add specified coolant mixture only. If the engine coolant tests too weak, add straight engine coolant until the readings are within acceptable levels. If the engine coolant tests strong, remove some of the engine coolant and add water until the readings are within acceptable levels. Verify the cooling system is correctly filled and bled. Refer to «COOLING SYSTEM DRAINING, FILLING AND BLEEDING»(ref-193003-S23731603382005092300000) . If DTC P1474 or P0480 are present, Refer to «SELF-DIAGNOSTICS - CNG, FLEX-FUEL & GASOLINE»(ref-152182) for diagnosis. If the concern remains after the inspection, determine the symptom(s). GO to «SYMPTOM CHART»(ref-193003-S22834014702005092300000) .

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Pinpoint Test D: The Electric Cooling Fan Is Inoperative

Refer to COMPONENT TESTING for schematic and connector information.

Pinpoint Test E: The Electric Cooling Fan Stays On All The Time

Refer to COMPONENT TESTING for schematic and connector information.

Pressure Test

1. Turn the engine off.
2. Check the engine coolant level. For additional information, refer to «COOLING SYSTEM DRAINING, FILLING AND BLEEDING»(ref-193003-S23731603382005092300000) .
3. Connect 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 press the plunger of the pressure test pump until the pressure gauge reading stops increasing, and note the highest pressure reading obtained.
5. Pressurize the engine cooling system as described in Step 4 (using a pressure relief cap that operates within the specified upper and lower pressure limits). Observe the gauge reading for approximately two minutes. For additional information, refer to «SPECIFICATIONS»(ref-193003-S11487451592005092300000) . Pressure should not drop during this time.
6. Release the system pressure by loosening the pressure relief cap. Check the engine coolant level and replenish, if necessary, with the correct engine coolant mixture. For additional information, refer to «COOLING SYSTEM DRAINING, FILLING AND BLEEDING»(ref-193003-S23731603382005092300000) .

Radiator Leak Test, Removed From Vehicle

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

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

Fan Clutch Test

1. Spin the fan blade by hand. A light resistance should be felt. If there is no resistance or very high resistance, check the minimum and maximum fan speeds as follows

Fan Clutch Test - Minimum Speed Requirement

1. Use a suitable marker to mark the water pump pulley, one of the fan blade retaining bolts and the crankshaft pulley.
2. Connect a tachometer to the engine.
3. Install a throttle adjusting tool.
4. Connect a digital photoelectric tachometer.
5. Start the engine and run it at approximately 1,500 rpm until the normal operating temperature has been achieved. The A/C must be off.
6. Adjust the engine speed to 2,300 rpm.
7. Operate the digital photoelectric tachometer at 3,000 rpm and aim it at the water pump pulley. Adjust the engine speed until the light flash and the water pump pulley mark are synchronized.
8. Aim the digital photoelectric tachometer at the fan blade bolts. Adjust the strobe light until the light flash is synchronized with the marked fan blade bolt (the fan blade appears to stand still).
9. The fan blade speed must not be greater than 1,500 rpm at 3,000 water pump rpm.
10. Turn the engine off.
11. If the fan blade speed was greater than 1,500 rpm, install a new fan clutch (8A616).

Fan Clutch Test - Maximum Speed Requirement

1. Carry out Steps 1 through 5 of the Fan Clutch Test - Minimum Speed Requirement.
2. Block off areas on each side of the radiator in the engine compartment and the front of the radiator grille. This will raise the temperature of the air striking the fan clutch and will cause the fan blade to operate at maximum speed.
3. Select the defrost and high blower mode on the DATC module.
4. Adjust the strobe to 3,000 rpm.
5. Start the engine and adjust the engine speed until the digital photoelectric tachometer light and the water pump pulley mark are synchronized.
6. Aim the digital photoelectric tachometer light at the fan blade retaining bolts. Adjust the digital photoelectric tachometer light until the light flash is synchronized with the marked fan blade bolt (the fan blade appears to stand still).
7. If the fan blade speed is less than 2,300 rpm, install a new fan clutch.