I have done it by taking the cooler line off at radiator, running the line into a drain pan, running it at idle, while adding fluid through the dipstick tube. Let it warm up before disconnecting the line, so it's not on fast idle.
One of the shops I worked at did not have a flush machine, and that was how we did them.
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I drive a hybrid, It burns gas and rubber..
Alcohol Tobacco & Firearms should be a convenience store, not a government agency.
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