hey fellow bongo owners,just wondering if anyone can help me on this problem im having,just recently changed my coolant and now coolant wont flow through the engine block,have tried replacing thermostat,have pulled out the radiator, got red devil radiators to flush it out and they also put it in some acid to unblock the radiator core,and i have pulled out the water pump,water pump seems fine,impeller blades in good condition,someone has suggested that an air block could be stopping the coolant from flowing thru engine block,some help please
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