100% water in cooling system - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 07-09-2014, 07:49 AM   #11
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You might consider removing the knock sensors and draining the block as well, in know crap will build up in the lower part of the water jackets.
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Old 07-09-2014, 08:20 AM   #12
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yeah.. that crap should be outlawed
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Old 07-09-2014, 09:37 AM   #13
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Why, whats wrong with the green stuff?
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Old 07-09-2014, 12:05 PM   #14
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he is talking about "stop leak"
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Old 07-09-2014, 01:45 PM   #15
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Oh, good luck getting that crap out. Probably take a couple gallons of carb cleaner ran through the radiator and heater core.
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Old 07-11-2014, 10:05 PM   #16
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Thanks.
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Old 07-13-2014, 10:25 PM   #17
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Ok, I think I solved all my problems. Kept on flushing until I got nothing but water coming out. Ran the engine a few times and put in some coolant.

Now she runs fine and the fans don't run all the time.
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Old 07-14-2014, 05:48 AM   #18
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Glad to hear it'* better now!
After a complete water flush when u do add coolant always use the full strength stuff not the 50-50 mix.
I found to get it to -45F I had to drain rad again and add pure coolant to get it right.
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Old 07-14-2014, 10:54 AM   #19
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Yes, I only use the100% stuff. I don't understand how people are willing to pay almost as much as full price for water...

I put in 1.5 gallons. I don't know what its rated to but here in texas if it ever gets to -45 it will be the end of the world.
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Old 07-14-2014, 06:54 PM   #20
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I suppose being in Texas it never really gets too cold, so you'd never have to worry about the possibility of 100% coolant gelling up in the coolant passages, not that I have heard of that happening a lot..
It does get really hot there, and considering waters thermal conductivity is much higher than glycol, I am not sure I personally would run 100% coolant.
Basically we only add antifreeze because it increases the boil over temperature, and reduces the freezing point.
Wouldn't using 100% coolant effect the pressure in the system from time to time?

You may not have any issues at all, but if it were me in your case I'd go with a 60/40, or at most a 70/30 mix of antifreeze/distilled water.

NOTE: I am not saying you will have issues using 100% coolant, you will definitely have a lot less chance of corrosion, just wanted to bring up some points that I read about when I flushed my coolant system the last time, I went with 60/40 because it gets really cold here in the winter, and I like my heat to get warm faster, as I hate freezing..
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