They marketed these coolant recovery kits back in the early sixties.
I remember installing them on each of the family's cars over the years.
I don't recall that they included a different radiator cap.
But I do know that there was a fill-level range on the plastic
overflow bottle. You needed a minimum amount of water in there
to be sucked back into the radiator as it cools. I would think
it may take several cycles before the air bubble at the top of
radiator is completely replaced by water. But my experience
was that these add-on devices worked very well ... in fact,
just like the ones that had (by then) become standard equipment.
There was never any mention or requirement to replace the whole
radiator; that's for sure. The old ones work just fine.
Make sure there's the required amount of coolant in the bottle,
Karl, and let it work for awhile. I'll bet it will be okay.
- Dan
Woodinville, WA
P.S. I regularly run the heater for awhile on my old cars, to make
sure the heater valve opens and coolant also gets circulated through
those hoses and heater core. You can get air bubbles in there, too.
And I find that temp gauge readings are unreliable until/unless
I exercise the heater circuit. Helps cool a hot engine in traffic, too.
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