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Old 05-15-2013, 01:59 PM   #1
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Exclamation Flushing Gunk

My 98 V6 that I have been repairing had a blown head gasket, and had developed grey gunk in the cooling system (radiator, radiator hoses, overflow tank ect.). The car is almost finished and I have to now clean out the whole cooling system. The grey gunk is really sticky and at hard to reach places it is very hard to clean. Are there any tricks that someone could share with me on how to clean this gunk out? Are there any cooling system flushes that will clean out the gunk?
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Old 05-15-2013, 02:09 PM   #2
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Did you put anything on the head bolts when you put new ones in. If you did it might just be that
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Old 05-15-2013, 03:58 PM   #3
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By any chance, did you ( or anyone ) mix coolants? Such as orange dex cool mixed with green regular coolant? That combination gets really gunky.
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Old 05-16-2013, 08:55 AM   #4
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Get the BG coolant cleaner. Pour a bottle in the radiator (make sure the coolant is topped off) and then run the car for 15 minutes. Drain the coolant and then refill with new coolant
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Old 05-16-2013, 01:53 PM   #5
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The owner before me mixed dexcool with regular water. Would that do it?
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Old 05-16-2013, 01:56 PM   #6
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Quote:
Originally Posted by StingrayLightning View Post
The owner before me mixed dexcool with regular water. Would that do it?
Was it pre-concentrated dexcool(50/50) or straight dexcool? If straight dexcool and water that is fine. 50/50 and water isn't so good. I would do what Foozbird recommended.
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Old 05-16-2013, 02:19 PM   #7
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Dexcool and water doesn't gunk up, in fact it's supposed to be 50 percent dexcool 50 percent water. If it's more water or more coolant that's fine. 100% coolant is not fine, by the way.
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Old 05-16-2013, 03:57 PM   #8
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Quote:
Originally Posted by HotRoddCamaro View Post
Dexcool and water doesn't gunk up, in fact it's supposed to be 50 percent dexcool 50 percent water. If it's more water or more coolant that's fine. 100% coolant is not fine, by the way.
LOL.. Nor is 100% water for that matter !!
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Old 05-16-2013, 04:33 PM   #9
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Quote:
Originally Posted by HotRoddCamaro View Post
Dexcool and water doesn't gunk up, in fact it's supposed to be 50 percent dexcool 50 percent water. If it's more water or more coolant that's fine. 100% coolant is not fine, by the way.
IIRC, the optimum concentration is 40% coolant and 60% water to maximize the antifreeze properties
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Old 05-16-2013, 04:36 PM   #10
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Quote:
Originally Posted by Ercmann View Post

LOL.. Nor is 100% water for that matter !!
Good point. Lol
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Old 05-17-2013, 09:47 PM   #11
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check this video man,, This is what I call a Hot Flush,, with motor running and a hose on high,, I think it could have good results as well. Start watching it at 3:47
https://www.youtube.com/watch?v=ytszhcqK_pg
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