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


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Old 07-08-2014, 02:13 PM   #1
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Default 100% water in cooling system

HI all,

I had blown my upper intake a few months ago. Finally got everything fixed. Since the PO had added leak stop I had planned to flush it out. THe instuctions on the flush say to remove all the collant and replace it with 100% water + their flush and drive for 6 hours total.

I have just performed this I noticed the operating temperature of the car is now up to 250 on a short drive. It bounced to 200 and back to 250.

Is that normal with 100% coolant or do I have another problem?

Thanks.
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Old 07-08-2014, 02:31 PM   #2
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Just a guess but I'm thinking that the temp sensor needs some antifreeze in the coolant to operate properly, i.e. electrolytes to conduct current. I used to have a p/u camper where the fresh water level indicator wouldn't work without a teaspoonful of salt in a 30 gallon tank. After replacing the water with a 50/50 mix of water and antifreeze I would guess that your temp gauge will return to normal operation. May take a few miles and driving cycles for the PCM to relearn after the errant signals it received.

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Old 07-08-2014, 04:15 PM   #3
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sometimes it does that when you change the coolant till you get the air worked out. you have a bleed screw on your car?
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Old 07-08-2014, 04:36 PM   #4
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Not sure. What would that look like?
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Old 07-08-2014, 05:12 PM   #5
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looks like a small bolt coming out, with another smaller one screwed into the top. if im remembering my cars right my bonnie had one on water outlet to the upper hose
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Old 07-08-2014, 05:13 PM   #6
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https://www.gmforum.com/mechanical-1...2005-a-304071/

in the first pic on the hose outlet for the thermostat
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Old 07-08-2014, 05:16 PM   #7
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Yup. that'* it. I have one.

I did run the car with the radiator cap off. Do I still need to use the bleeder? if so, how does it work?

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Old 07-08-2014, 08:13 PM   #8
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Problem here is, running straight water like that with no cap on is bad.


One, when water hits 212*, it boils, when it boils, the water goes from a liquid to a vapor which then exits out the radiator.


Now'* the time to drain whatever water out, and replace with straight coolant, not the 50/50
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Old 07-08-2014, 10:01 PM   #9
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Agreed mike,

I'm just trying to get rid of the crap that'* in it. (leak stop)

Any advice?
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Old 07-09-2014, 07:41 AM   #10
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i dont use that crap. so i have never had to try to get rid of it. i guess i would drain it and put more of the flush in, with the 50/50 and change it again in a few months or sooner if it gets nasty looking
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