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2002 Deville DTS Coolant


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Been a long time since I have posted. I changed the coolant in my 02 DTS today. Drained radiator per service manual instructions. The manual says capacity is 12.5 quarts. There will be 2 quarts left in engine with no way of draining. I installed sealant tabs into the hose that crosses the radiator from pass side to drivers side. My question is that I put about 1.25 gallons in through the surge tank, idled the car with A/C on and set at 90 degrees. The temp gauge got up to normal. I am currently leaving the car cool down to ambient temp. Why did it not take at least 2 gallons? How do I know for sure it is filled correctly? I now have an over full surge tank. I hope the level goes down when it cools and i can get at least 8 quarts in it. Any help will be greatly appreciated.

Thanks, Millwright71

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Sounds like you did not measure how much coolant you actually removed. And I doubt if you removed much more than 5 or 6 quarts from the system.

The correct coolant level in the reservoir is 2 to 3 inches below FULL when the system is cold.


Drive your car.

Use your cell phone.


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The best thing to do is to flush the system. In the old days I kept a hose trickling into the radiator with the drain petcock open while the car idled until the drain lost all color. This probably isn't a good idea for a reverse-flow cooling system like the Northstar or LS series bow-tie small blocks. You could fill and drain it with water three or four times to get most of the old coolant out. Others may have better ideas.

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Thanks Guys,

After gettin some rest, I drained my catch basin into the gallon containers, and sure enough, I only drained off a little over a gallon. I removed the excess from my surge tank, and will drive it to heat cycle it a couple times, then top it off if it needs it. As always, thanks for the info, that's why I keep coming back to this site.


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