bad coolant

[kawo]

I flushed the cooling system last night:

1. drain old rusty coolant
2. put tap water + radiator flush cleaner, run about 10mins until engine warm
3. drain and flush with tap water continuously for 30mins
4. repeat 2 and 3
5. put tap water, run until the engine is warm, let it sit for 2 hours
6. drain, there is still a little bit rust color but it is way better than the first drain, 10 times better

I now put distilled water with Redline Water Wetter to the radiator. I did not put anitfreeze as weather here will not be freezing.

I know the water inside the engine that blocked by thermostat is still tap water, I will try to drain the whole system next week and fill with distilled water to better dilute the tap water that I scared it would cause problem.