Hi,
I recently changed the coolant in my Honda. This is the method I used.
1) Drain coolant from water pump and from engine block.
2) I Then plugged up both drain holes and filled radiator with distilled water only. *I did not start the engine*
3) I then drained from the water pump ONLY. I did this procedure twice.
4) Filled the radiator with a 50:50 pre-mixed coolant.
5) bled air by running engine without cap.
6) added coolant mixture to reserve bottle & topped off radiator.

I'm concerned that by not draining the block after each fill of distilled water that an amount of plain distilled water remained in the engine, rusulting in dilution of the coolant mixtureI added to the system. I thought by not starting the engine during filling the system with distilled water that it wouldn't make it to the engine, I've since come to the conclusion that it has.

Can anyone comment on the amount of water that may have been left behind in the engine?? And whether the coolant has diluted too much?

Total capacity of the cooling system (engine and radiator) is 3.2litres apparently. I'm guessing 600-900mls of water stayed trapped in the engine block area because I could only fit around 2.3ish litres of coolant in it. Is this what you would expect? I think the coolant concentration is currently around 35 - 40% - Is this sufficient in providing corosion protection??

Cheers.

 

If you're worried, why don't you just drain a little out and top it off with some non-premix coolant?

 

Why don't you go grab one of those super cheap radiator fluid checker things? (Find them at any auto-parts store). You know... the ones with the little floating ***** that tell you the protection level of the radiator fluid. Do that and just make sure it's within' "safe" specs. If there's too much water, it will show up as having too little protection.