Quote:
some like cheap pumps, others rads
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and others cars.
I'm thinking that solder joint was weak from the beginning, but had never been sufficiently stressed (original leak test was with just a 6 ft water column). The recent rapid rise in room temperatures, combined with a sealed-system reservoir that contained more air than it ought, could have increased pressure enough to pop a weak joint.
The core has held 10 PSI for a day now, so it'll go back into service tomorrow.
I would have take both cores and blowers from the van, but it too was a vehicle that wanted the entire dash removed, plus a weird structual beam under the dash.