... that works well enough to heat the entire Vanagon has developed a tiny [for now] leak. it seems that the valve housing is plastic to plastic. I don't see a gasket. should there be one?�can I fab one, put it in AND expect it to work ? hope everyone enjoyed a safe and happy All Hallows Eve. thanks for any help. mike - `85 GL 1.9L , auto.,A/C and a copy of the original Maroney in the side glass������� =(: D)