If coolant is leaking from the heater, the radiator is leaky and needs to be replaced
Never delay fixing a coolant leak in a car interior, as its fumes are harmful to your health.
You will need a screwdriver.
Remove the glove box.
Remove the windshield trim (see "Removing, installing and repairing the windshield wiper").
Drain the engine cooling system (see "Changing the coolant").
Remove the outside air filter
Remove the screws securing the filter housing.
Remove the screws securing the electric fan housing.
Remove the heater mounting bracket screws.
Remove the passenger foot warmer duct.
Pull up the heater bracket
Remove the intermediate duct.
Remove the heater core mounting screws.
Loosen the clamps on the radiator inlet and outlet hoses and remove the hoses.
Remove the heater core from the casing
Install the heater core and all removed parts in the reverse order of removal.
Fill fluid into the engine cooling system.
