Instructions for removing the heater core of a vehicle include disconnecting the negative battery terminal, draining coolant from the radiator, removing all hoses and attachments, and then unmounting and removing the heater core itself. Instructions may vary depending on the complexity of the vehicle, but the basic steps remain the same for most models.
Every vehicle is different and consulting the owner's manual is an important step before attempting to remove a faulty or malfunctioning heater core. Hot engine coolant is a safety concern, so the removal process should only begin once the engine has had time to cool. After draining coolant from the radiator, small amounts of antifreeze may spill from the hoses attached to the heater core, as well as the core itself. Some vehicles may require the removal of the interior dash, glove box or other components in order to access the heater core.
The heater core is a radiator-like device that provides heat for the interior cabin. Hot coolant from the vehicle's engine passes through the winding tube of the core and a fan forces air over the core and into the passenger cabin. Removal of a heater core is often required in the event of a clog or for cores that are leaking, ruptured or suffering from excessive corrosion.