02 WRX, 70k miles

Had issue with coolant dripping between water pump assembly and block 1500 miles ago, then dripping onto heatshield and vaporizing, minimal loss... but smelly and annoying, replaced water pump / timing belt / water pump gasket with OEM subaru parts.

Now 1500 miles later the drip is back, smelling coolant pretty heavily when idling, see some green coolant deposits along the topside of the tstat housing, am i expierencing that tstat flashing cast issue and need to sand it down and replace the lower rad hose?

what's going on here?