I started adding water to my 1939 Ford Truck radiator which has a heater. I have one heater hose connected to the lower passenger side hose with a nipple that was installed into the rubber hose. I apparently haven't got the connection completely tight as it is leaking slightly. When I take it off and try to tighten it again, is there any kind of sealant that I could use to make it water tight or is there a location on the block that I could connect this hose to (perhaps to the driver side head) and get it away from that lower hose. The other heater hose is connected to a fitting in the passenger side head. Thanks.