>>The glycol will 'slump' in the rad apparently
I learnt that when rebuilding an Austin 7 engine. The waterways were partly blocked by a jelly like substance. The anti-freeze had 'set'. It relied upon thermo-syphon to circulate the coolant and without a pump to agitate it happens.
Another car would boil the coolant for the same reason. Simple to cure with a good flush.
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