A heater core acts much like a radiator, in order to heat the inside of a vehicle. Prior to replacing a heater core, it is a good idea to verify that heating problems cannot be attributed to a leaky hose or an improperly connected clamp. If those components are intact, then move forward with replacing the heater core. Although the heater core itself is not difficult to replace, getting to the assembly on your Audi A6 Quattro can be a challenge since it is located under the dashboard on the inside of the vehicle.
Tools Used: Tools, Socket wrench, Screwdriver, Pliers, Compressed air, Container, Clamps, O-rings, Coolant
Install Heater Core
Move the front seats as far backward as possible to allow for enough space to work. Disconnect the negative and positive battery cables by loosening the clamps, and remove the battery.