If you haven’t been doing so, start changing your transmission fluid and filter every 30k miles or so, and use only transmission fluid that meets ATF+4 specs. Anything less will croak the transmission in short order. People badmouth the A604 and its derivatives all the time, but before they were released to the general public, test bed models were racking up over a million miles without a rebuild or any problems. Keep maintenance up to date, perform repairs in a timely manner, and this car will last and last. By the way, those steel heater pipes are a very common issue on those vehicles. You are not alone having to fix that, and it does not spell the beginning of the end for this car unless you allowed the engine to overheat badly when they started leaking. Regardless of what a lot of people say, I think the Chrysler minivans are very nice vehicles, and easy to fix. Drive on and enjoy your van!