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air lock in engine/new thermostat/still overheating?

have air lock in citroen picasso 2.0 hdi diesel.fitted new thermostat and bled the system via the 2 bleeder valves.engine overheats and when i open reservoir cap a hot rush of water escapes apparently under pressure.any ideas.
gerry, February 2010
Hi, could be that the head gaskets blown.

Chris P.Duck, February 2010
link Click here to see other fixes for Citroen.