After pulling apart the HVAC system on the Elco, the next phase was to pull apart and check the cores to make sure they at least appear to be viable. Because of the nature of the car we're dealing with, I can only imagine the replacement cost for either the heater core or evaporator will be enough for me to say "fuck it" on the HVAC system if I had to replace everything. The next thing I need to give attention to is the modification/simplification of the HVAC system. This, as stated before, involves removing most of the old controls of the system and pinning a couple of blend doors to one position so air will only move out from the defrost vent and the chest level vent. I pulled the box apart to pull the heater core out. A few bolts separated the box allowing me to easily pull the core out, and to my satisfaction spill nice green coolant everywhere. This more or less tells me that the core should be pretty good, versus if the liquid that came out was shit brown from rusty water being in there, which would've told me the core was clogged with trash. With the heater core written off as good, I moved on to the air controls. One of the blend doors the pair of actuators controls is the defrost vent. Our vent will be pinned open all the way in order to keep air from moving around and down to the floor vent. The other actuator controls one half of the blend door that routes air to the chest level vents. That vent will be half pinned open and half pinned closed. In the meantime I pulled the actuators from the plate they were mounted on as I still need the plate, just not the actuators. The heater box showing the positions of the blend doors as they will be secured. The left vent is the defrost, with the vent in the down position to only allow air to pass up through the vent. The blend door to the right is the 2 piece door, with the top closed to help regulate the amount of air that would pass through the chest level vents vs the defrost. The bottom half of this blend door is pinned back, blocking some of the passage of air into the defrost vent. Because the heater core is placed where half of it is in the path of the defrost vent and half is in the path of the chest level vent, putting the blend doors where they're at will actually regulate the amount of AC that is allowed to pass around and up to the defrost vent while still allowing most of the heater air to move through to both the defrost and chest level heater. The only blend door control that is going to be retained in this simplified system is that of the hot/cold selector blend door. Especially since the blend door is cable actuated, this already vital control will be kept as is. This vent and its cable will be hooked back up to the HVAC control panel in order to restore its operation. With the battle plan mapped out for the blend doors, the next move will be time to get the doors pinned to their positions so we can start getting some of this stuff back together. Once we get both HVAC boxes installed we can then move on to the electrical system.
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