On a '10 3.5 DOVHC Taurus,,,, passenger side,, front of motor, behind ac compressor,, and alternator,,, there is this hole. Coolant oozes out of hole,, there was a small plug like thing in round hole,,, but loop/slot at top was open. Is there suppose to a rubber plug / grommet to cover this orifice thingy ???? Ford garage techs do not know what it is,,,,is it just a breather,,, and coolant should not be behind it if all is ok inside engine ?????