Why not try some proprietary pour-in radiator sealant first? Our S70 was losing coolant from the rad core, and having just spent significantly on new tyres, brakes and shocks I didn't really want to start hauling out the radiator too.
That was three or four months ago, and a leak that would see the expansion tank empty in a day had remained totally fixed, with absolutely no loss of coolant since.
Cheers
Jack
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