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How to completely drain GM LT1 engine coolant

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Published on Sep 28, 2010

Due to it's unique reverse-flow cooling system, some people can be intimidated when it comes to proper cooling system maintenance on GM 5.7L LT1 and 4.3L L99 engines. In this video I show how to completely drain the engine block of coolant on these engines. Merely draining the radiator leaves 60% of the old coolant in the block, and also does not facilitate being able to run fresh water through the cooling passages to remove sediment and rust.

Follow along as we do the process on our subject vehicle, a 1994 Chevrolet Caprice with 259,000 miles.Enjoy!

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