We have a 2000 Windstar and we have a coolant leak, the leak is coming from a metal line coming off left pass. side of block. The line y's into 2 approx. 1" lines, I assume that this is the lines for heating., I was able to get the hoses loose however I cannot seem to get the metal line out of the block, it has one hex head screw holding it in place. Any suggestions are greatly appreciated.