Join Date: Jul 2005
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Very, very unlikely that any damage will have arisen from an airlock. There is no way of telling how long the air pocket existed. Most likely "event" is that the heater will not have been as effective as it could have been.
Currently in Ivor_E_Tower's garage:
2014 Captur dCi EDC; 2014 Ka 1.2 Zetec; 2015 C-Max 1.6 TDCI