170k miles. For the past couple of days, I've seen white smoke coming from the engine compartment. I can't locate the source, but I see green fluid on the ground (can't pin point where that's from). I used radiator sealant - no effect. My water pump is ok, hoses tight. There's no water coming out of the tail pipe, but late this evening, I saw white smoke (normal for not having driven car for a while?). Where is the leak?