03 D2 195k. I’ve had a nominal leak for years but in the past few weeks I’ve been loosing coolant after i shut the truck off. Is more than a drip maybe enough to fill a tic tac container or a little more. It’s coming from the passenger side close to fire wall. Heads haven’t been done and I’m guessing that this may be a sign. The truck can sit for a week and nothing. Doesn’t smoke no coolant in oil. I did notice the coolant was low after using the heat for the first time don’t think it’s related since the leak starts as soon as I turn the truck off.