Are you a firm believer of tap water in your cooling system?

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Old 06-23-2013, 04:42 PM
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Are you a firm believer of tap water in your cooling system?

06 Sti
108,xxx miles
coolant has been changed each and every year with green and distilled water

you may wonder why i change it every year.....pure and simple...if you ever work in the automotive industry you will know how damaging a badly maintained cooling system can get...especially on aluminum parts...

so heres to it...radiator top tank started leaking...
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end tank removal on the radiator:
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and whala:

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Last edited by houdni; 06-23-2013 at 09:49 PM.
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Old 06-23-2013, 08:44 PM
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As long as you have a good mixture and proper maintenance then nothings wrong with tap water. Besides i dont think our tap water down here is that bad...
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Old 06-23-2013, 09:06 PM
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Oem Subaru radiators give up the ghost like clock work in the 110-120k mileage range. So your radiator lasted as long as it was suppose to..

Tap water gets the job done, but I'm a fan of putting distilled water in my coolant systems..
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Old 06-23-2013, 09:09 PM
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Also: are you trying to compare tap vs distilled water in coolant systems?? Is the purpose of your pictures just to show that your radiator has remained clean because you use distilled over tap? TIA
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Old 06-23-2013, 09:13 PM
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Mine lasted to 65k. But not exactly sure if the previous owner used tap or distilled.
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Old 06-23-2013, 09:43 PM
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Originally Posted by SUMATIC808
As long as you have a good mixture and proper maintenance then nothings wrong with tap water. Besides i dont think our tap water down here is that bad...
there's a lot of things wrong with tap water and i would hope nobody would listen to you because you "don't think the water down here is that bad". what kind of retarded answer is that? even if it weren't bad for the radiator (which it is), do you think thats the only place the water goes? go look up scaling and galvanic corrosion and you'll have a pretty good idea why only a true idiot would use tap water and not spend the $5 to buy distilled. oh and if you think we have good water here, try look in your toilet bowl. if you have a brown ring you can scrub out it's likely you have water with high levels of iron like i do. every city has different water makeups but none of them are as good as distilled water. so save yourself some trouble and learn from houdni's example.
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Old 06-23-2013, 10:21 PM
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If you want a rusty cooling system that will fail early nothing is wrong with tap. However distilled water is great. Especially with water wetter.
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Old 06-23-2013, 11:05 PM
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Very good reason honestly to drain and fill yearly, it's cheap insurance to keep the system lubricated with fresh coolant (with additives to keep aluminum from breaking down)

I'd like to pose a question for you though, in a rad that's sat for an unknown amount of time with what seems to be a mix of green/distilled, is there a treatment you can flush through to prevent issues down the line?
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Old 06-23-2013, 11:56 PM
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Originally Posted by tesh
Very good reason honestly to drain and fill yearly, it's cheap insurance to keep the system lubricated with fresh coolant (with additives to keep aluminum from breaking down)

I'd like to pose a question for you though, in a rad that's sat for an unknown amount of time with what seems to be a mix of green/distilled, is there a treatment you can flush through to prevent issues down the line?
when your in a pinch...you do what you need to to to keep from overheating...even if it means adding tap water....

as for a treatment to prevent issues down the line....probably to just start maintaining the system now...meaning a radiator flush and fill...or find some shop with a BG coolant service machine and products...
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Old 06-24-2013, 12:04 AM
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Originally Posted by azer408
If you want a rusty cooling system that will fail early nothing is wrong with tap. However distilled water is great. Especially with water wetter.
too much water wetter is not a good thing either. I found lots of silcone deposits in my motor when I took it apart.
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Old 06-24-2013, 12:26 AM
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tap water leaves a ton of deposits.. which is almost impossible to clean without professional tools and solvents. i hate white crusty stuff in my cooling system!
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Old 06-24-2013, 01:48 AM
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Originally Posted by corytomo
tap water leaves a ton of deposits.. which is almost impossible to clean without professional tools and solvents. i hate white crusty stuff in my cooling system!
Unfortunately that's what I'm faced with recently, a neglected cooling system through an all aluminum motor, I guess I'll be looking to flush with a garden hose and fill, maybe 60/40 so coolant has a higher concentration of corrosion inhibitors...

Thanks houdni for the advice and nice pics! Too bad those end tanks are so prone to breaking! A recycler would have a hard time believing that core was ever in service its so clean
*edit* It's good of you to show everyone that despite the radiators which crack etc, the condition of the aluminum in the rad reflects the condition of the entire cooling system and passageways in the motor - clean rad = clean motor = motor longevity

Last edited by tesh; 06-24-2013 at 10:55 AM.
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Old 06-24-2013, 02:35 AM
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Originally Posted by Alliedforces86
Oem Subaru radiators give up the ghost like clock work in the 110-120k mileage range. So your radiator lasted as long as it was suppose to..

Tap water gets the job done, but I'm a fan of putting distilled water in my coolant systems..
this. Radiator failure is a common problem. My failed at 89K miles.
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Old 06-24-2013, 09:55 AM
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Originally Posted by 1JavaBlk_in_Sac
this. Radiator failure is a common problem. My failed at 89K miles.
i think you both missed his point entirely.
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Old 06-24-2013, 12:48 PM
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Originally Posted by 04sleeper
there's a lot of things wrong with tap water and i would hope nobody would listen to you because you "don't think the water down here is that bad". what kind of retarded answer is that? even if it weren't bad for the radiator (which it is), do you think thats the only place the water goes? go look up scaling and galvanic corrosion and you'll have a pretty good idea why only a true idiot would use tap water and not spend the $5 to buy distilled. oh and if you think we have good water here, try look in your toilet bowl. if you have a brown ring you can scrub out it's likely you have water with high levels of iron like i do. every city has different water makeups but none of them are as good as distilled water. so save yourself some trouble and learn from houdni's example.
IDGAF. Ive seen many vehicles last as long as this with tap water. Why dont you stop being a ****in ******* and chill out. You got issues man.
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