Section 562 (HVAC Systems (Service Information)): Plumbing: Core-Heater: Description
WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
The heater core (1) is mounted into the HVAC air distribution housing, located behind the instrument panel. The heater core is a heat exchanger made of rows of tubes and fins. The heater core tubes (2) are attached to the HVAC housing by a bracket and screw (3) and to the heater core by a flange and bolt (4).
The heater core can be serviced without removing the air distribution housing from the vehicle.