7.3L strength Stroke Coolant do the washing up & Cooling System business Guide

Cooling device neglect have the right to lead come sludge and also buildup in the radiator and engine water jackets. Like engine oil, coolant breaks down with time and details compounds, particularly silicates, fall out of suspension and also begin come collect. This process not only decreases the thermal efficiency of the cooling system yet threatens to clog radiators, oil coolers, heater cores, etc. The only method to protect against such problems is to flush and also service the cooling system routinely as asked for in the OEM maintenance schedule.

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Ford recommends servicing the cooling system originally at 50,000 miles and also at 30,000 mile/36 month intervals thereafter. A an easy cooling system business should incorporate a do the washing up (with or there is no the usage of a clean solution) and replacement that the upper/lower radiator hoses, radiator cap, and also thermostat. Additionally, the cooling system should it is in thoroughly purged with a chemical therapy anytime oil or fuel is discovered mixed with the coolant, such as in instances where an oil cooler or injector cup has failed.

7.3L power Stroke Coolant Selection

We generally use typical Motorcraft VC-5 ethylene glycol engine coolant in the 7.3L strength Stroke. Convert to an ELC is desirable, yet the 7.3L strength Stroke is commonly less sensitive to coolant type than engines such together the 6.0L strength Stroke and also early IDI motors. If you prefer to upgrade to an ELC (extended life coolant) to minimize future organization costs, that is imperative that the cooling mechanism is thoroughly purged first. While the 7.3L strength Stroke doesn"t normally have cavitation issues, we extremely recommend including a SCA/DCA (diesel coolant additive/supplemental coolant additive) to the cooling system if not utilizing a pre-charged ELC. The SCA/DCA level have to be confirm and changed routinely in between services.

ELCs are frequently found in medium and heavy duty diesel applications. Their organization life is commonly in the 300,000 to 600,000 mile range, meaning they are much more resilient come thermal break down and contamination. ELC options that we"ve provided with good success incorporate Shell Rotella ELC, shell Rotella Ultra ELC, and Fleetguard OAT ELC. International additionally has their very own ELC, yet it deserve to be complicated to situate a dealer. If you"re going v the problem of converting to one ELC, select a silicate free coolant.

7.3L strength Stroke Coolant Flush procedures

The procedures listed below are gift performed top top a 1994 - 1997 generation Ford F-Series. While the cooling device is slightly various on later on 1999 - 2003 model year engines, the procedures are entirely compatible with all 7.3L power Stroke diesels.

We often tend to recommend avoiding generic over-the-counter flush/cleaning solutions that accessible at your regional auto components store. The OEM solution is Ford VC-1 Premium Cooling mechanism Flush; it"s hard to go wrong with the product arisen by Ford for Ford vehicles. Fleetguard restore (CC2601) also comes very recommended together it is formulated to eliminate silicate gel (buildup), oil, and fuel remnants.

The flush/service procedures below are time consuming together they do not need draining the engine block and therefore do not fully drain the mechanism at once. Instead, they simply remove the old coolant by way of a collection of distilled water flushes. After sufficient flush cycles, the amount of old engine coolant staying in the cooling mechanism will it is in negligible at best. Arrangement on purchasing in the ballpark the 20 gallons that distilled water. Tap water have to never be offered in a cooling device - it has particulates, minerals, and also chemicals that carry out not belong in through your engine coolant.

component Numbers because that Cooling System business

Part Description

Part Number


Upper radiator hose

1994.5 - 1997

Motorcraft KM2989

1999 - 2003 single alternator only

1999 - 2003

Motorcraft KM4495

Lower radiator hose


Gates 21405


1995 - 1997

Gates 22216

1999 - 2000

Motorcraft KM4542

Motorcraft KM4542

Motorcraft KM4671

2002 - 2003

Motorcraft KM4671


1994.5 - 1995

Ford F4TZ-8575-CB

Thermostats not interchangeable between all design years

1996 -2003

Ford F6TZ-8575-EA

Thermostat housing

1994.5 - 1997

Ford F4TZ-8592-AA

Replace if too much scale/build up/pitting at mounting flange

1999 - 2003

Ford F81Z-8592-AA

Thermostat real estate gasket

1994.5 - 1995

Ford F4TZ-8255-A Victor Reinz C32036

1996 - 2003 thermostat consists of gasket

1996 - 2003

Motorcraft RG602

Radiator overflow/degas party cap

Ford 9C3Z-8101-B

Always replace throughout cooling device service; seal frequently hardens, cracks, etc.

Ford ethylene glycol concentrated engine coolant

Motorcraft VC-5 concentrated engine coolant

4 gallons required, procedures listed below only compatible with focused coolant, no premixed green coolant.

Ford cooling system flush solution

Motorcraft VC-1 Premium Cooling device Flush

"Fast flush" solution

Ford SCA/DCA coolant additive

Motorcraft VC-8 diesel cooling device additive

Optional, encourage w/ Ford coolant

A focused engine coolant must be supplied in bespeak to get a appropriate 50/50 coolant-distilled water ratio. That is impossible to accomplish the suitable ratio utilizing a premixed engine coolant with these procedures.

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• The radiator drain valve/petcock is situated at the bottom of the radiator top top the driver side. Affix a section of 3/8" heater water tap or fuel heat to the petcock so the it deserve to be drained there is no running down the radiator crossmember.

• drain the radiator right into a perfect drain pan (minimum 4 gallons).


• fill the cooling mechanism with distilled water through the coolant overflow reservoir/degas bottle. Fill to the cold to fill line, execute not overfill the system.

• Start and run the engine, enabling it to reach full operating temperature. You may need to take it the truck because that a short drive in order come reach operating temp.

• After to run engine at operating temp for a minimum 5 minutes, shut off engine and enable to cool. Drainpipe the cooling mechanism once more, climate fill with distilled water.

• once again enable the engine to reach and also run at operation temperature because that a minimum 5 minutes, then drainpipe the cooling system.

• add a cleaning/flush equipment per the product"s instructions. Allow engine to operation at operation temperature every product"s instructions. Fleetguard gain back requires to run the engine for a minimum 60 and also maximum 90 minutes at common operating temperature.

• drain cooling device once engine has cooled appropriately. Fill mechanism with distilled water. Repeat the drain, fill, run procedure a minimum 3 more times in order to completely flush any type of remaining engine coolant and also cleaning solution.

• after 3 drain, fill, operation cycles, assess the color of the cooling system as that drains. The goal to have actually a cooling mechanism that is completely filled through clean distilled water and only negligible quantities of engine coolant. If the cooling system does not drain clear, repeat the flush procedure (refill, run, drain) till the cooling system drains clear. It generally takes united state a complete of 7 trials from start to finish.

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• If the cooling mechanism drains clear, do not refill and continue to service the cooling system. The device will it is in refilled and also balanced v a 50/50 distilled water, engine coolant mixture after ~ the company has been completed.