It's my understanding that there are no engine block drain plugs for coolant. I've got the 5 0 Coyote in my 2017 Lariat. In order to get as much coolant mixture out of the system to make room for at least 2 gallons of concentrate, has anyone added an inline valve, such as a flushing tee, to the inlet or outlet hoses that run to the cooler next to the oil filter? Since that's a low point on the engine, that would seem get the most liquid drained out. Your thoughts?

 

IMO i wouldn't mess with it. Drain all the coolant you can and then just replace with the new

 

Call me hard headed, there's got to be a better way to get a more complete drain of coolant than out of the petcock. To make a long story short, I've got pure distilled water in the system now and I just need to get 2 gallons of the water out to add the concentrate. The most you can get out of the peacock is maybe 3/4 of a gallon.

 

I've always unhooked the lower rad hose and done it that way

 

After replacing the thermostat, I removed the hose clamp at the stat housing and inverted to end into a bucket. I got a little bit more but not enough. I'm also thinking about the heater hoses that tee off of the main heater hoses and go down to the transmission oil cooler. That's also a low spot that could drain the heater core and the heater hoses.

 

+1
Thats what I do

 

Secure the lower hose in a bucket and start the vehicle. Let the water pump push the rest out for a couple seconds.

Alternatively, you could continue draining and adding distilled water until you feel it's a high amount of water only.
Then fill with straight coolant to 50% of the total capacity, leaving you close to 50/50. Adding concentrate to a system somewhat diluted now won't be a 50/50 mix likely.

How many gallons does the system claim to hold? You have 8 quarts of water and probably 10 or more of left over coolant in the block, right?

 

No, there's no coolant left, only di water. I went the slow route and constantly added, drained, added, drained, di water until it was clear - took about 6 gallons of di water.
The cooling system holds 15.9 quarts, so I need to get rid of 2 gallons of di for the concentrate.
That's a good idea about disconnecting the bottom hose. I might try that this time, but in the future, I might try cutting a valved tee in the heater hose line down at the trans cooler for future draining. I definitely won't be running it very long with the hose disconnected!

 

Gotcha, I didn't know you already had full water in the system. (or I maybe didn't read it).

 

I just had this "bright" idea,. Draw off 2 gallons of tap water into a drain bucket and mark the level in the bucket. Pour it out and place the empty bucket under the petcock. Start the engine cold and open the petcock. Let the bucket fill up to the 2 gallon mark, then close the petcock. Now I've got the 2 gallon 'room" for the concentrated coolant.