got the truck with 265k on it and i want to flush out all the old gunk in the coolant system

which line do i tap into to back flush
what additive does anybody recommend for removing scale/etc?

thanks

 

prestone radiator flush

 

i am unsure what line to tap into as the service manual states it is the heater inlet tube.which one is that?inlet?do i run the engine while doing it?do i turn the heater on?

???????

 

Here is a Cummins Service Bulliten, Its a read!

Cummins® Coolant Requirements and Maintenance

Here is the part that is important to what you need right now.

Cleaning Procedure for Removal of Lubricating Oil and Fuel from the Engine Cooling System Using Fleetguard® Restore™ Liquid Cleaner

Prior to cleaning the cooling system, install adequate coolant system draincocks, fittings and hoses to allow the coolant to drain quickly. The system must be drained immediately upon engine shut down. Therefore, it is suggested that a tee fitting be installed in the fill line to allow the top tank/expansion tank to drain quickly. In addition, a fabricated tee connection must be installed in the lower radiator out plumbing if sufficient drain ports are not available to drain the system quickly.

Operate the engine at 1200 to 1500 RPM for 30 minutes with sufficient load to open the thermostat(s) to produce flow through the radiator. Also, make certain that flow is achieved through any cab heater cores or auxiliary heat exchangers.
Drain the contaminated coolant from the cooling system using available radiator, cylinder block and lower radiator hose drain ports. Flush the cooling system with hot tap water as much as possible before beginning the chemical flush procedure. Use caution when handling hot coolant and dispose of the used coolant in an approved manner.
Pour 3.8 liters [1 gal] of the liquid cleaner into the radiator and finish filling the system with tap water. This mixture is satisfactory for a 12 - 14 gallon cooling system. For larger cooling systems, add 3.8 liters [1 gal] per 57 liters [15 gal] of system capacity. Do not reinstall the radiator cap. Leaving the cap off facilitates inspection of coolant flow in the radiator along with eliminating the cool-down time required for radiator cap removal.


CAUTION


Do not use liquid dish soap. Foaming and air lock in the cylinder head(s) can occur causing severe engine damage.


Operate the engine at 1200 to 1500 RPM for 30 minutes with sufficient load to open the thermostat(s) (minimum 85°C [185°F] coolant temp) to produce flow through the radiator and/or heat exchanger(s). Operating the engine without load will prolong the cleaning process. To increase operating temperature and decrease cleaning time, disable the fan drive or cover the radiator core completely. Check for flow through the radiator. Failure to get the cooling system hot enough to fully open the thermostat(s) will leave the radiator core contaminated although the engine side will be clean. Be sure to open and/or set the heater controls in the maximum heating position. If loaded engine operation is not possible, block the thermostat(s) open to produce radiator circulation. If coolant does not become hot enough, adequate cleaning will take much longer and additional flushes can be required.
Shut down the engine and drain the cleaning solution quickly by utilizing all of the available drain ***** and/or via the fabricated lower plumbing arrangement. Draining the cleaning solution quickly reduces the chances that oil residue will stick to the cooling system surfaces, which will prolong the flushing process.
After the cleaning solution is drained from cooling system, fill the cooling system with plain tap water. Operate the engine for 15 minutes at 1200 to 1500 RPM while it is still hot.
Drain the tap water from the cooling system. The water will contain cleaner and oil residue and must be disposed of in an approved manner.
If the tap water does contain oil residue, the system must be cleaned again. Return to Step 3 above and repeat use of the cleaner until the tap water used to rinse the system has no more oil residue and no oil is observed in the radiator. It may be helpful to inspect the inside of coolant hoses and pipes for evidence of oil adhering to the surfaces.
Once the cooling system is thoroughly cleaned, return the system to the original configuration and install new, fully formulated antifreeze/coolant meeting Cummins Engineering Standard 14603.
If applicable, install a new coolant filter sized appropriately.

 

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