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There might be a small blockage some where and the waterpump is not strong enough to get around it. When I put the hose pipe through the rad it flows ok.

Hi all.First time here. I just purchased a 2007 3.6 v8 diesel with overheating problems. I have changed water pump and thermostat and still the same. So removed both thermostats and still coolant not cicirculating. Bottom pipe cold and top one boiling.i have bled the coolant so many times now...