Ahh, I got the drain plug in my sights thanks. ... Not in a hurry to play with the heater core!! Just afraid that it may be the culprit. would doing a low PSI pressue test while it is on the car be an option? And is there more than one heater core? seems as if there should only be two tubes for a single heater core, but these cars have four options where coolant flows into the firewall.. How confused am I?

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46 WDX Power Wagon

84 300TDT daily driver