Its easy to rationalise and say its old hoses but something may be causing a higher pressure in the system so now they are starting to let go (thermostat?). If they are old, of course they may be root cause, but if you haven't changed the various cooling system wear items, now sounds like the time to do it. Also make sure you are using an approved or at least (well proven in BMW, Volvo) coolant in the right ratio for your weather.
Oh yea, sometimes the bleeder won't bleed. You just have to remove it and clean corrosion from the hold with a pin. If your girl is doing doing big drives, it'd be worthwhile.
All large sixes can leak coolant into the exhaust when warming up, the gaskets leak as the block and head expand at different rates. My M30 did it for years and years before blowing a small leak to the outside, not the cylinder side. If you smell coolant, check if it isn't in-cabin o rings on the heater core- its dead easy to pull all the dash bits to get in and fix it up with $4 worth pf parts.
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