look in the manual
YOU DON'T!!! I have a 2003 avalanche and I had to replace the water pump you can't replace the seals!!! It's a defect in the 2001 to 2003 avalanche the seals fail.
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It has no drain plug on the A/T.
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my 2003 express 4.3 v6 takes 30gallons
aprox 1.5 hours