The past week or so, I've noticed a smell that I believe was coolant leaking onto the headers. This morning I saw a coolant leak coming from the housing of a (watercock?) valve right by the headers. I've been using the heater a lot recently here in Virginia, and I just bought this car from my sister in Miami (she NEVER would need to use the heater), so I assume that this part crapped out from years of disuse (seals cracked, whatever). This looks like it would be an extremely simple fix...but until I get my shop manuals, can someone please tell me what exactly it is? the pump/motor looks fine, the black housing (circled in green) is slowly leaking as if a seal is busted (the second picture shows this better). Thanks for your help!!!