Low Coolant / shut off engine

I had a car with two pitcocks. It had to be jacked up or on hill then crack them open otherwise air stayed in.

 

I had a freightshaker that did that same thing

 

Well still a problem. As soon as hot enough to open thermostats the tank fills all the way up. Looks like bubbles on driver side of tank or just maybe from vibration.
Light comes on at idle for low coolant. Goes out as soon as I drive about 20 feet.
Float is working .
I assume both hoses on back of block are outlets so it would not matter if they were switched when installed ?
If I loosem cap I just loose a half gallon coolant and solves nothing.
So why would tank full up when thermostats open .

 

Mine is . magnetic. I am thinking my air compressor may have went bad when truck lost water . It is taking a long time to air up the secondary

 

It fills all the way up and if undo cap will poor out at idle a half gallon coolant .
Float is floating up with it.
Wired that light goes out as soon as I start driving. Although coolant level remains full to top

 

I just started truck. Light was on when I parked a couple hours ago. Light came right on. I idled to 1500. About a minute later it went off.
I knew I should have just bought another freight shaker . At least it's problems were not this odd.

 

Any words of wisdom on a aftermarket coolant tank ?
180.00 to 275.00 .

 

Video of tank filling up, it will fill all the way full.
Had to use link since it is too large to upload
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