It should have self bled by now especially after a longer journey.
Don't these models have an auxiliary electric heater core along with the traditional water heater core for quicker cabin heating? When the auxiliary belt snapped it would have knocked out the alternator, therefore no charge nor voltage regulation available so check to see if the fuse for electric heater blew at the same time.
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Liam...
'96 854 TDI SE, '99 V70 2.5D S, '05 C70 2.0T Collection, '05 S80 2.0T SE, '15 V70 D4 SE Lux Nav.
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