Do not throw the water hose in there and let it run. Take it easy and do a little by little

 

umm what happens if I had done that before?

 

You now have stalagmites/stalactites compromising your cooling system.

You didn't hurt it just rinsing it out.

Motorcraft has concentrated and pre-mix 50/50 to fill it back up with. I get the concentrated myselp along with a few gallons of distilled water. You don't have to use distilled water, - but if you plan on keeping it for awhile, -it's the best choice. You can just go with the 50/50 if you deep pockets.

Put it this way, have 319,000 on the truck and still using the factory original parts..Hoses,heater-core included. Changed/flushed every 3 years.

 

Don't forget to drain/flush the block each time as well.

It's only every 3, but man, it can really suck if you neglect that..catastrophic suckage.

 

thanks for telling me and I didn't wash it out with a hose one of my friends did when the oil cap "flew off" as he said so I'm now finally going to clean the motor and parts when I do the tune up