The floor on the passenger side of my '87 4Q is soaked! It appears to be water, but does not smell, taste, or look like antifreeze. Is it possible that the heater core has gone south? Never heard of this happening on the 4000. What's a new core cost these days? Does installation require breaking something? Any tips, thoughts, insights, condolences glady accepted. The usual thankz, etc. Duane Hale San Diego