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The reason in why you must evacuate the a/c system with an a/c machine before you can remove the heater core is because the evaporator is located inside of the heater core box assembly. So before the heater core box assembly can be removed the a/c system must be evacuated then you can disconnect the a/c lines that go through the firewall to the evaporator.
i am assuming you mean heater core, you have to remove the pass rear cargo trim panel and any trim that interlocks to it as well as any connectors then the heater box and hoses from under the vehicle as well as if it has rear ac the ac system needs to be discharged first and those lines removed as well, then remove the box from the vehicle and seperate the case halves and replace the core, the reinstall in the reverse order of removal
First disconnect steering knucke under dash. Remove dash assembly to reveal heater/AC case. Disconnect heater hoses from engine compartment. Discharge and capture AC refrigerant. Remove heater case ,replace heater core . re-assemble .
the heater core is located in the black box that is in the pictures (see below). To get access to it, you will need to remove the blower housing. The blower housing will separate from the main HVAC box, and will give you some space once it is out. Then we need to wrestle the main box loose from the firewall. That means dealing with the A/C pipes, heater hoses, vacuum hoses, mounting stud nuts under the hood and mounting bolts inside. Once the box is moving, the dash needs to "get floppy" so you can pull back the passenger side far enough to give the main HVAC box enough room pull away from firewall, and to "roll" back towards you. At this point the heater pipes will be visible, and the cover that contains the heater can be removed. It's a big job. Your car has A/C. The description in the haynes book is for a car w/o A/C. If you're not comfortable with plastic dash board removal, this job is not for you
Dear Foggy Film...... You are correct!!! This foggy film is the result of the antifreeze leaking and then evaporating inside the cab of the vehicle. The heater core on this vehicleis located inside the evaporator case inside the vehicle's cab on the firewall up underneath the dash closer to the passenger's side. It involves about three hours labor to replace the heater core.This is a moderate to mildly intensive repair for the first timer..if you have any more questions then you're more than welcome to get back to me!!!! HOPE I COULD HELP!!!