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If it is necessary to remove the heater assembly, the cooling system must be drained before removing the heater core.
When a heater core leaks, a new heater core is installed or the old one repaired. Heater Housing
The heater housing is usually under the dash and must be removed to gain access to the heater core.
Procedures for replacing the heater core vary with the year, make, and model of car. It threfore necessary to consult the manufacturer's repair manuals for the proper procedure for replacement.
The heater housing is disassembled to get to the heater core.
Remove the access panels(s) or the split heater/air conditioning case to gain acess to the heater core.
Remove the heater coolant hoses.
Remove the cable and/or vacuum control lines (if equipped).
Remove the heater core securing brackets and/or clamps.
Lift the core from the case. Do not use force. Take care not to damage the fins of the heater core when removing.
To reinstall the heater core, reverse the removal steps.
When the heater core leaks and must be repaired or replaced, it is a very difficult and time-consuming job primarily because of the core's location deep within the firewall of the car. For this reason always leak test a replacement heater core before installation.
your attempting to try a job that you really shouldn't try, the steering column will have to be dropped,the entire dash comes out of car,the AC needs vacumed down and disconnected,and that just gets you to the heater box assembly,your still another hour away from seeing a heater core .when we did these jobs at the dealers with all the tools available to us,it was a 12 hour job,then you have to recharge the AC yet
It's not heater coil, it's heater core. Unfortunately, it's on the passenger side under the dash. If you're really, REALLY lucky, you can replace it without removing the dash, but it's not likely. Buy a Hayne's Rapair Manual for your car at Autozone. It's a life saver. (And a money saver.) Good luck.
you may have a cable or rod disconnected or broken under the dash which connects the hot cold switch to the air diverter door. the door may be in the cold position and with the cable broken it can not change its position. make sure this door is operating first.
if it is then your problem is more then likely with the heater core you can try flushing the heater core by disconnecting the hoses going to the heater core from the engine side of the hoses and putting a funnel in the hose so that you can pour water through the core if the water flows freely then this is not your problem. reconnect the hoses.