How to read coolant test strips

[Mattman]

(04-07-2020 )JimT Wrote:  When draining/refilling like this do you still need to use a vacuum on refill? Also, about how low can you drain the coolant before you hit the point where a vacuum fill is needed?

Hey Jim T just seen your question.

I drained mine till coolant quit coming out. Poured about 11 gallons in then started truck and let it run. Keep adding coolant till it got over the cold full Mark.
Let it sit overnight and it had dropped below add mark. Filled it back up. Figure I put in about 13 gallons total. I don't have one of the vacuum sucker things.