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It is a heater core not an evaporator. Core is locater against the firewall behind the dash. If the fluid level has gotten low recently it could have air trapped in the core. The return hose from the core is located on the driver side under the hood, under the cover on the cowl. The hose has a bleed hole located under the clamp. loosen the clamp, slide the hose back and expose the hole.. Fill the coolant bottle and run the engine. when you get a steady stream of coolant the air is out. If you still have no heat it could be an issue with the doors in the evap unit. Remove the glove box and check to see if the doors move when you use the controls. If all that is ok you have a plugged core.
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.
The leak is the evaporator which is in the dash.The complete dash has to come out to remove the hvac plenum to remove the evaporator.It is about a 7 to 10 hour job.The factory evap.core is about $475 and what ever the labor rate is for the repair shop.Hope this helps.Good luck.
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.
Dear Heater Core Hunter, For your 01 expedition, that has the 5.4 liter motor in it, the heater core is located in the evaporator case assembly, where the blowermotor itself is located,This is a pretty darn good labor intensive job, if you open the passenger front door and get down onyour knees and look up underneath the dash.....that's what you're going to be removing and replacing, the heater core is inside of this black case.Please get back to me if you have any more questions...I'M HERE TO HELP!!!