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Water in coolant

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Old Jul 25, 2007 | 02:22 PM
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Default Water in coolant

I changed my thermostat today with a 160* I lost a good bit of coolant which I wasn't expecting as i have changed thermos out before without much lost coolant. Anyway, I thought I had a gallon of distilled water laying around to top it off but it I didn't. I needed to get into to work so in a pinch I poured in about a gallon, 13 pints to be exact, of Poland Spring water in so I could get to work. Will this plain water damage anything? Should I drain it out tomorrow for 50% distilled and 50% coolant?
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Old Jul 25, 2007 | 03:03 PM
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I wouldn't worry about the water. Basic tap water is not the best because it may have some sediment, rust ... but I'm sure that bottled water you used was filtered plenty.

But you do need to get the coolant back to 50/50 before the winter.
I'd drain out about 1/2 the amount you put in and add some straight dexcool. Pick up a hydrometer at an auto parts store and check the specific gravity (freeze point) and that will tell you if you have added enough.
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Old Jul 25, 2007 | 04:05 PM
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The '05 Service Manual says tap water! I used distilled on my t'stat change but it looks like Chevy thinks tap water is OK.
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Old Jul 25, 2007 | 05:18 PM
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thanks for the replys wasnt sure about the plain water as i always used distilled but if the manual says tap i guess bottled is ok.
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Old Jul 25, 2007 | 07:32 PM
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Should have used Fuji
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Old Jul 26, 2007 | 07:23 AM
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If it doesn't hurt your stomach, can't see how it would hurt your cooling system?????
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Old Jul 26, 2007 | 09:41 AM
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When you changed your thermostat did you also change your fan setting to come on earlier?

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Old Jul 26, 2007 | 09:58 AM
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Originally Posted by Wicked Weasel
When you changed your thermostat did you also change your fan setting to come on earlier?

Yes, via predator Flash programmer
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Old Jul 26, 2007 | 10:27 AM
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Originally Posted by edv2122
Yes, via predator Flash programmer


I see people change the thermo and not change the fan settings which to me doesnt make sense.
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Old Jul 26, 2007 | 10:46 AM
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Originally Posted by Wicked Weasel


I see people change the thermo and not change the fan settings which to me doesnt make sense.
Ya Changed the fan setting and I didn't see any temps over 198 at idle on a sunny 80* day. Cruising temps were around 172ish.
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Old Jul 26, 2007 | 11:04 AM
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Originally Posted by k0bun
Should have used Fuji
I thought Fuji was for Japanese cars. Just don't use Evian - that's for Pugeots.

We always used to get funny looks when we bought 15 gallons of distilled water to fill up a new mainframe. For some reason people didn't seem to believe us when we explained what it was for.
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