[Koder-S]

Получилось сделать так

var markers =[];
google.maps.event.addListener(map, "click", function(e) {
  var infoWindow = new google.maps.InfoWindow({
                 content: 'Latitude: ' + location.lat() + '<br />Longitude: ' +   location.lng()
             });
                         var lat =location.lat();
       var lng =location.lng();
       for (var i = 0; i < markers.length; i++) {
               markers[i].setMap(null);
             }
       marker = new google.maps.Marker({
                         position: {lat: lat, lng: lng},
                         map: map
                         });
      markers.push(marker);
});