CUTLASS Best way to flush/change coolant?

78Delta88

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Shop uses the reverse flush machine. They just plug it in and let it run and go do something else.

Just get the Prestone kit, I've used those for years.
 

86LK

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Jul 23, 2018
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since I'm working on my auction truck (07 Silverado) right now, does anyone know where to find the data for how much fluid a radiator holds? is it 1-1/2, 2, or 2-1/2 gallons?

note that I am not asking about total cooling system, but just the radiator
 

Rt Jam

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Mar 30, 2020
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since I'm working on my auction truck (07 Silverado) right now, does anyone know where to find the data for how much fluid a radiator holds? is it 1-1/2, 2, or 2-1/2 gallons?

note that I am not asking about total cooling system, but just the radiator
Why do you want to know?
 

abbey castro

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Oct 31, 2015
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since I'm working on my auction truck (07 Silverado) right now, does anyone know where to find the data for how much fluid a radiator holds? is it 1-1/2, 2, or 2-1/2 gallons?

note that I am not asking about total cooling system, but just the radiator
It doesn't matter what the capacity is, fill the radiator to the neck, then fill the coolant return bottle to the cold fill line. Warm it up add coolant IAW coolant bottle mark. This is not rocket science so don't make it so, it isn't. Good Luck
 

86LK

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It doesn't matter what the capacity is, fill the radiator to the neck, then fill the coolant return bottle to the cold fill line. Warm it up add coolant IAW coolant bottle mark. This is not rocket science so don't make it so, it isn't. Good Luck
only one problem....an 07 Silverado doesn't have a radiator cap.... it fills up via the Overflow tank

the reason I want to know how much the radiator holds is because when I do fill up I want o have a good idea of how much should be going in because there is always some unknown residual amount left in the block. I don't like playing guessing games.
 

abbey castro

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Oct 31, 2015
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only one problem....an 07 Silverado doesn't have a radiator cap.... it fills up via the Overflow tank

the reason I want to know how much the radiator holds is because when I do fill up I want o have a good idea of how much should be going in because there is always some unknown residual amount left in the block. I don't like playing guessing games.
Utube it, there are a bunch of videos showing how to do it.
 

78Delta88

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Following is just a swag... Scientific or (Silly) Wild A** Guess. Don't know your exact specs so pulled from Rock Auto 34 x 18.125 x 1.25 Core. For tanks just extrapolated it as 3 columns = (1.25 thick x 18.125 high x 1.5 wide).

Core is 770.3125 cubic inch or 12,623.1603 CC

Tanks (SWAG) ... 67.97 cubic inch or 1,113.829 CC

Total = 13,736.9893 CC/ml = 13.74 Liters = 3.63 Gallons.

And you are probably around 60% of that = approx. 2.2 Gallons?

Still seems kind of high.
 

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78Delta88

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About the only way to do it, unless you can find out actual capacity from GM books, would be to:

Remove and lay radiator flat make sure it's empty and add measured amounts of water and total that up.

Figuring the wife doesn't want her good Pyrex out in the garage, I would suggest the 1 or 2 quart plastic paint container and pour into radiator until full. Keep track of total quarts poured and total up and convert to gallons. 4 quarts = one gallon.
 

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