I believe the fluid is pumped through under pretty high pressure and if it is a positive displacement pump you can't just block it off but someone will have the knowledge.
Note it's not just the hoses that can go, pipe connections on the cooler itself are a weak point. Mine developed a crack and started leaking and was replaced. Thankfully not while out in the bush.
Perhaps some suitable hose and clamps to loop the pipes together?
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1996 D1 V8 - gone
2002 D2 Td5 ES- gone but still running elsewhere
2013 D4 SDV6 HSE - gone
2023 Defender 110SE D300
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