I've searched the archives and have not found a decent description of how to do a thorough flush. I need to do it right away as I changed a water pump and have not added any anti freeze yet.

Radiator shop wants about $200. Includes a new thermostat, but I doubt it's a cummins.

 

I have always used "10 minute rad flush", and ran it for 2 hours at 1200 RPM. This is a procedure that a well know Rad shop gave me years ago. After that, its a drain, refill with water, run, repeat until the water comes out clean, and not milky.

 

I didn't use a "flush" product, I just drained the radiator via the plug on the drivers side bottom. There was alot of gunk that quickly blocked the plug from the inside, so I used a garden hose to flush out the radiator from the top with the drain open.

I just flushed my radiator, heater core and what hoses I could get at. I figured a little old coolant in the block mixed with majority new coolant I threw in won't hurt anything.

Make sure to use distilled water when mixing coolant!

 

Can we get 3 gallons of water out of the cooling system without pulling the water pump to get 50% antifreeze solution in the cooling system?

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How'd you flush your heater core?

Not all municipal water contains enough elements to require distilled water.

 

As much as it sucks to pay money for water, I typically use a pre-mix coolant.

You probably can get 3 gal out easily. When I do a t-stat, or minor coolant repairs, I don't drain much coolant. I take the rad cap off, and run a 3/8" hose down to the bottom of the radiator through the rad cap. Then I siphon out as much coolant as I can into a pail, or water can of sorts.

 

Whatcha want to bet that the antifreeze makers use nasty mud puddle water in their 50/50 mix? Scam like bottled water. Would be so much cheaper to use tap water in manufacturing process. Just my gut feeling.

 

I drain the coolant, then remove the T stat and take the top rad hose of the radiator and stick a hose into the radiator fill cap and turn the hose on. I then start the truck and let the water flow out of the top rad hose into a bucket or the ground, until it clears up. You could use some rad flush before this process too.