I don't understand the coolant bleeder/tank system

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I'm a fan of the "AirLift" system. Replaced the WP, T-stat, and engine mount on my '02 base a couple of years ago. After watching a few YouTube tutorials on use of the "AirLift" system it was easy peasy. Used a 6 gal. pancake compressor to draw vacuum.

I like the fact that you can verify the integrity of the cooling system based on whether or not it holds vacuum. If there is a problem you can recheck your work prior to re-filling the system. Saves a lot of time in potential rework and you can refill the system in no time with no worries of air in the system.