Have a coolant leak.  Don't know what the part is called. Two hoses come from the firewall (heater element), one goes to the upper radiator.  The second connects to a pipe which then connects to the top back of the engine block.  The connector that holds this pipe in place at the block is squirtinig out fluid from a hole in the connector.  This connector is rusted.  How do I remove it without damaging the block/pipe that it's connected to.  Oh ... and what would the "official" name for this connector be?  Thanks for the help!