Feb 20, 2015, 05:59 PM
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c6 coolant flush
Drifting
Joined: Apr 2010
Posts: 1,443
Likes: 7
From: Bristol raceway area
Get the front in the air loosen the drain plug on the lower right of the radiator, flush everything good and replace Dexcool, SLOWLY. I did this about 5 months ago. Piece of cake. The system practically bled itself of air unlike having to "burp" the C5's. If you want to check for air, there is a hose in front coming off the drivers side head near the top you can disconnect to see if there is fluid coming out of it. Good luck.
Drifting
Joined: Apr 2010
Posts: 1,443
Likes: 7
From: Bristol raceway area
I did mine Exactly as i stated. Couldn't have been easier. As for the heater i involved it but i have not heard of these cars with "heater control valves" like the older cars. I only had to cycle the rpm's a few times. The system bled itself.
With just a drain i got out 2 gallons.
With just a drain i got out 2 gallons.
Speedy
Joined: Mar 2007
Posts: 6,073
Likes: 903
From: Tn
2024 C8 of the Year Finalist - Modified
i was looking to flush the system and use something other than dexcool as i here it corrodes aluminum, also to keep engine temps down i wanted to run a more agressive mix in terms of %water, what is the minimal amount of antifreeze needed provided i live in the midwest, and will be running water wetter
Race Director
Joined: Oct 2005
Posts: 14,999
Likes: 199
From: Bay Area Ca.
i was looking to flush the system and use something other than dexcool as i here it corrodes aluminum, also to keep engine temps down i wanted to run a more agressive mix in terms of %water, what is the minimal amount of antifreeze needed provided i live in the midwest, and will be running water wetter
With water wetter you can run straight water only, with the addition of the wetter, if you desire.
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Speedy
Joined: Mar 2007
Posts: 6,073
Likes: 903
From: Tn
2024 C8 of the Year Finalist - Modified
they make an additive that breaks down dexcool, you flush the system, add the killer, flush again then free to do what you want
Melting Slicks
Joined: Nov 2007
Posts: 2,269
Likes: 544
From: Pittsburgh PA
St. Jude Donor '10-'11-'12-'13-'14
Speedy
Joined: Mar 2007
Posts: 6,073
Likes: 903
From: Tn
2024 C8 of the Year Finalist - Modified
Team Owner
Joined: Sep 2000
Posts: 24,903
Likes: 2,618
From: Far NW 'burbs of Chicago
St. Jude Donor '13
GM has been using Dexcool in the Corvette for over a decade, and there have been very few problems that might be related to that use.
Experimenting can be fun, or frustrating and expensive.
Experimenting can be fun, or frustrating and expensive.
Cruising
Joined: Apr 2011
Posts: 13
Likes: 1
From: Loudonville NY
I find it funny that people will spend 50K to 100K on a car that has had as much testing as the Corvette then replace the coolant with a fluid that will void their warranty. I can see performance upgrades and exterior improvements but the fluids in your car have been tested and in some cases designed for your car or engine. I heard Extra Virgin Olive Oil makes your engine run cleaner and you can gain 45 HP in the process send me $5 and I will give you the ratio's. ))))))
Safety Car
Joined: Nov 2007
Posts: 4,537
Likes: 1,401
From: Bethesda MD
There should be a mixture chart on the bottle, showing the mix% and effective temp. I confirm mix ratio with an antifreeze tester after a couple days use.
Safety Car
Joined: Nov 2007
Posts: 4,537
Likes: 1,401
From: Bethesda MD
The antifreeze mix definitely has a higher boiling point. Even adding 20% - 30% coolant significantly increases the boiling point. Something has to fail to get a 20% coolant mix to boil over in normal driving. Only time I've ever seen over 230* with a 160 t-stat is with a stuck thermostat or when I miswired my fans on my 99. :o
Maybe the road race guys see high coolant temps when the oil hits 270+
I've also seen some undersized systems (i.e. mods added far in excess of stock capacity) hit 240*
Maybe the road race guys see high coolant temps when the oil hits 270+
I've also seen some undersized systems (i.e. mods added far in excess of stock capacity) hit 240*
Last edited by Ragtop 99; Apr 26, 2011 at 04:52 PM.
Le Mans Master
Joined: Oct 2006
Posts: 5,078
Likes: 19
From: Cumming, GA
.... it's a sad day if you really believe this.We're talking 15deg more tops with a 50/50 mix actually.
Last edited by LEAVINU; Apr 26, 2011 at 05:02 PM.
Pro
Joined: Nov 2007
Posts: 547
Likes: 3
From: Silicon Valley California
St. Jude Donor '09-'11
GM DexCool is not a great product. See the following links about DexCool
http://www.sancarlosradiator.com/dex-cool.htm
http://www.sancarlosradiator.com/dex-cool_pics.htm
If want to keep using a "DexCool" like product, so as to not void your warranty, use a somewhat better product. With any coolant, you should be replacing it every two years. With the original GM factory fill DexCool, I was sorry I didn't do it the first year as there was a little bit or orange stuff stuck inside the overflow tank.
I use Zerex DexCool.
http://www.valvoline.com/products/br.../antifreeze/41
http://www.sancarlosradiator.com/dex-cool.htm
http://www.sancarlosradiator.com/dex-cool_pics.htm
If want to keep using a "DexCool" like product, so as to not void your warranty, use a somewhat better product. With any coolant, you should be replacing it every two years. With the original GM factory fill DexCool, I was sorry I didn't do it the first year as there was a little bit or orange stuff stuck inside the overflow tank.
I use Zerex DexCool.
http://www.valvoline.com/products/br.../antifreeze/41
