Quote:
Originally Posted by itsjustascratch21
If your topping up with that, you'll be fine. Tap water is fine too, adding coolant for a top up is overkill.
If you're performing a drain and fill 80/20 is probably okay depending on how much coolant you have on hand. I wouldn't worry about it too much water under pressure has good heat capacitance.
The heater core hoses and o-rings take a beating in the summer if you run the air conditioning in traffic.
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I do not recommend this, especially using "tap water".
Use a 50/50 mix of coolant/distilled water, no matter where you live, no matter the time of the year. There's way more properties to antifreeze than simply preventing freezing, fact...