About Expanded Tube Heater Cores

Expanded tube heater cores, also known as mechanical heater cores, first hit the market in the 1990s for Chrysler and high-end import applications. This style consists of copper tubes, aluminum fins, and plastic tanks.  There are some models that do not have a bottom tank, therefore the tubes are exposed.  Aftermarket models with this style have been designed with aluminum tubes and O.E. applications have started following suit.