Coolant overflow capacity?

RustyRatRod said
I've never seen any style of recovery tank that worked very well.

That’s because you haven’t seen this one work.

clementine said
I have been eyeing the recovery tanks that have the inlet on the bottom and a hole in the cap. I’m assuming that style would require the cap to be as high as the rad cap?

I check fluids before the first start of the day so it’s no biggie but in attempt to not spill coolant when I don’t have to…meh, maybe saint Petey will be impressed

This is a thermos modified to make a recovery tank.
The radiator is a 26 inch three row core with 5/8 tubes, so it has some capacity. (Arizona)
The thermos has two walls, an inner and an outer.
I cut an opening in the outer wall on the bottom, then drilled the inner tank for a tube fitting.
On the inside of the neck I drilled a 1/8 vent from the inside tank that vents between the two layers and out the opening in the bottom.

No air in the cooling system and I never see coolant.
A quick squeeze on the top hose to check coolant levels once in awhile.
If I hear coolant sloshing I add a little to the recovery tank.
Maybe overkill, but better than under.