How do you change a heater core in a 1999 elantra?

Answer 1

CAUTION: Some models are equipped with anti-theft-radio make sure you have the activation code before disconnecting battery * If the car is equipped with A/C has the system discharged first * Disconnect the negative battery cable * Set the heater control to hot and then drain the cooling system * Working from the engine compartment side of the firewall mark the heater hoses to ensure correct installation loosen the hose clamps and then disconnect the heater hoses from the heater core tubes.Plug the hoses to prevent dirt from entering the cooling system.You'll see a vacuum line connected to a vacuum pipe at the firewall right below the larger of the two heater hoses.Disconnect this line and plug it * If the vehicle is equipped with A/C disconnect the refrigerant lines from the evaporator connection tubes.Plug these lines to prevent dirt to entering A/C system * Remove the air conditioning and heater control assembly and the radio.Remove the instrument panel assembly * Disconnect the vacuum line from the door motor in front of the blower assembly. Note the routing of this line between the door motor and the heater unit. * If the vehicle is equipped with air conditioning remove the evaporator assembly * If the vehicle is equipped with cruise control,electronic time and alarm control (ETAC) and/or keyless entry system unplug the electrical connectors from the cruise control module,the ETAC module and/or the keyless entry module * Remove the bolts that attach the cruise control and the ETAC/keyless entry module brackets to the left vertical member of the center fasica panel support bracket * Remove the screws that attach the air conditioning and heater control assembly bracket to the left vertical member of the center fasica panel support bracket * Remove the bolts that attach the right vertical member of the center fascia panel support bracket to the vehicle and then remove the right vertical member and the three horizontal support brackets as a single assembly * Peel back the carpeting on the right side and then remove the bolts that attach the crossbar support bar to the vehicle and then remove the support bar * Peel back the carpeting on the left side.Detach the rear floor vent ducts from the rear floor vents and from the heater assembly and then pull each duct to the rear and remove it. * Remove the mounting nut and bolt from the right side of the heater unit and remove the mounting nut from the upper left side * Remove the heater assembly from the vehicle * Disconnect the vacuum hose from the metal vacuum line on the left side of the heater case * Disengage the heater core cover retaining clips from the heater case and then remove the heater core cover * Pull the heater core out of the case