These have an O-ring in there.  Take it apart, clean and
use silicone  seal on it.  Works  every time, for me.
                                                  Eric

Melvin Mudgett-Price wrote:

>Let me try and describe where the leak is. The heater core under the
>rear seat has 2 hoses to it. These attach to a small block that has a
>valve and lever on it. The valve bolts onto the housing for the rear
>heater. It's leaking where the join to the plastic housing is. I don't
>see a gasket in there but I've not dismantled it because the leak is
>slow enough to allow me to drive the van.
>
>Can I get a gasket? Should it have one? Could I use one of the liquid
>gaskets? If so, what do you recommend, it obviously gets hot from the
>coolant flowing into the heater core.
>
>Thank you
>Melvin
>
>
>
>