DIY 4.6L & 5.4L Cooling System Service - Flush, Thermostat, & Hoses

Engine coolant breaks down over time, stimulating corrosion and also leaving deposits in the engine"s cooling system. Flushing the cooling system periodically promotes longevity of the radiator and also maximizes cooling device performance. It is equally necessary to routinely rearea the thermostat and radiator hoses, which deserve to, crack, come to be soft, and also lose their integrity. While a typical flush requires distinct equipment that pumps new coolant with the engine and also collects the old liquid, the procedure described herein is just as reliable and, finest of all, have the right to be percreated by anyone with basic DIY abilities.


Related Topics:


Ford F-150 Transmission Service
5.0L, 5.8L V-8 Thermostat Replacement
4R70W Transmission Service & Filter Replacement
4.6L, 5.4L V-8 Starter Replacement

Ford 4.6L, 5.4L Cooling System Service and also Engine Coolant Part Numbers

To appropriately business the cooling device, you will require (1) overflow tank cap, (1) thermostat, (1) thermostat housing gasket, (1) upper radiator hose, (1) lower radiator hose, 3 to 4 gallons of engine coolant, and also 10 to 15 gallons of distilled water. A focused engine coolant is forced for the cooling mechanism flush steps outlined herein; a prediluted coolant will certainly NOT occupational through these actions.

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Model Year(s)

Engine(s)

Ford Part Number

Application Notes

Engine Coolant

1997 - 2002

4.6L, 5.4L V-8

Ford green engine coolant/antifreeze Motorcraft VC-5

2002 - 2010

4.6L, 5.4L V-8

Ford gold engine coolant/antifreeze Motorcraft VC-7-B

Radiator Overflow Tank Cap

1997 - 2010

4.6L, 5.4L V-8

Motorcraft RS527

All design years

Thermostat

1997 - 2010

4.6L, 5.4L V-8

Motorcraft RT1234

190° F thermostat

Thermostat Housing Gasket

1997 - 2010

4.6L, 5.4L V-8

Motorcraft RG571

All version years

Upper Radiator Hose

1997 - 2003

4.6L V-8

Motorcraft KM3047

N/A

2004 - 2008

4.6L V-8

Motorcraft KM4739

N/A

2009 - 2010

4.6L, 5.4L V-8

Motorcraft KM4992

N/A

1997 - 2003

5.4L V-8

Motorcraft KM3051

N/A

2004 - 2008

5.4L V-8

Ford 4L3Z-8260-DA

N/A

Lower Radiator Hose

1997 - 2003

4.6L V-8

Ford 3L3Z-8286-BA

All drive types

2004 - 2008

4.6L V-8

Motorcraft KM4738

All drive types

2009 - 2010

4.6L, 5.4L V-8

Motorcraft KM4994

All drive types

1997 - 2003

5.4L V-8

Ford F75Z-8286-MA

2 wheel drive models only

1997

5.4L V-8

Ford F75Z-8286-KD

4 wheel drive models only

1998 - 2003

5.4L V-8

Motorcraft KM4744

4 wheel drive models only

2004 - 2008

5.4L V-8

Ford 4L3Z-8286-BC

All drive types

If your engine came from the factory through green coolant, than you"ll desire to usage Ford/Motorcraft green antifreeze. Likewise, if your engine initially came from the factory via gold coolant, you"ll desire to usage Ford/Motorcraft gold antifreeze (check out part numbers in chart above). Do not mix and complement coolant kinds.

The concept behind a DIY cooling mechanism flush is simple - continuously drain, refill, and also run the cooling mechanism in order to purge all the old engine coolant. On the last refill, we"ll execute some quick math in order to acquire the ratio of antifreeze-to-water correct. Plan on spending the better fifty percent of a day to flush your cooling mechanism, as regular warm up and cool dvery own durations will be required.

The following actions are based on the 4.6L and also 5.4L equipped Ford F-150s, however the standard strategy can be applied universally to nearly any kind of auto and also any type of engine. The procedures listed below were percreated on a 1997 to 2003 generation F-150; some tool sizes and also component places may appear different than those stated.

Upper/Lower Radiator Hose & Thermostat Replacement

Click any thumbnail to watch high resolution fullsize image w/ addition details (wright here applicable)


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• With the engine cool, drain the radiator right into a perfect container. There is a petcock on the passenger side, bottom corner of the radiator via a little drainpipe hose attached that runs exterior of the framework rail (if the hose is lacking, install one). Place a huge drainpipe pan beneath the drainpipe hose, then loosen the petcock via a 19 mm wrench until coolant begins to drain. Remove the radiator/overflow tank cap for quicker draining, although it will be a slow-moving process.


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• Install the brand-new thermostat and also thermostat o-ring, and also then reinstall the real estate and power steering liquid tank bracket (use anti-seize on all the bolt threads). Pay close attention to the arrangement of the thermostat, it must be set in the inlet choose the one in the picture at left.

• Clean the top radiator hose inlet fitting, then install the new radiator hose in reverse order. Verify that the clamps on all hoses are effectively secured.

• Install your brand-new radiator/overcirculation tank cap, then proceed to the flush actions.


DIY Cooling System Flush Procedures

1) With the radiator drain petcock closed, totally fill the cooling system via distilled water only (carry out not use tap water). Start the engine and also allow the truck to reach operating temperature. This ensures that the thermostat opens up and also water is circulated via the entire mechanism.

2) Once operating temperature is reached, revolve the engine off and also enable the engine to cool totally. Do not attempt the next step until the engine has cooled - severe injury might take place.

3) With the engine cool, drain the radiator. As vital, empty your drain pan into the empty water jugs. This water must be recycled at an correct location as it is taken into consideration hazardous waste.

4) Repeat actions 1 with 3 at least 2 more times. The even more times this procedure is recurring, the even more thounstable the flush. In our experience, repeating this procedure even more than three times has negligible impacts as the antifreeze concentration is fairly low at this point and the majority of of the old coolant has actually been reput by clean water.

5) At this stage, the engine need to have actually been fluburned a minimum of three times and is, for all intents and also purposes, completely full of pure distilled water. Before proceeding, make certain your drainpipe pan is entirely empty as it is necessary to meacertain the amount of coolant rerelocated for the final process.

6) Reference your owners hands-on and also discover your engine"s cooling mechanism capacity. This truck"s hand-operated claims that the complete cooling system capacity is between 5.14 and 5.4 gallons. You can take an average value, yet we simply assumed the larger capacity (the difference for our purposes is fairly little and also assumed to be negligible in determining the ratio of water-to-antifreeze). A complete capacity of 5.4 gallons indicates that our engine demands to have 2.7 gallons of distilled water to 2.7 gallons of antifreeze concentrate. Thus, we must drain 2.7 gallons of water from the device and rearea it with 2.7 gallons of antifreeze for a perfect 50/50 ratio. Prediluted coolants are not compatible via these company procedures.

7) Drain the radiator once aget through the petcock. Once finish, pour the water into your empty 1 gallon water jugs and usage them to measure the amount of water drained. At this point, we were able to drain approximately 2.5 gallons of water from the radiator. Because we need to remove a minimum 2.7 gallons, we pulled the reduced radiator hose. Another 0.5 gallons were drained.

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8) Determine exactly how much distilled water and antifreeze should be included. Our mechanism capacity is 5.4 gallons and we rerelocated ~3.0 gallons of water in our last drain. Therefore, the mechanism consisted of 2.4 gallons of distilled water at this allude. Because a 50/50 mixture is wanted, we"ll need to add 0.2 gallons of distilled water and 2.7 gallons of antifreeze.

9) Fill the mechanism with antifreeze through the radiator/overcirculation cap, then optimal off the system through distilled water as/if essential. Almethods fill via the required amount of antifreeze first; this prevents you from inadvertently adding as well a lot water. For us, we added ~ 2.7 gallons of antifreeze and then included distilled water until the level got to the "cold" range line on the overflow tank. If for some reason you had actually to add considerably even more water than calculated in step 8, a mistake was made and also you"ll need to double inspect your measurements. It is imperative that the correct quantity of antifreeze is added; severe damage might occur in cold weather if the ratio is substantially off. If something doesn"t include up, remap your procedures. If the overfill tank becomes full before you are able to add the forced amount, take the truck for a brief drive to occupational out any type of air bubbles in the device, then proceed filling the cooling device.

10) Allow the truck to reach operating temperature, then verify tright here are no leaks and also that the cooling mechanism is filresulted in the appropriate level. If these actions are performed correctly, your calculations have to align through the amount of water/antifreeze included to the cooling system.